CVE-2025-21681
published 2025-01-31CVE-2025-21681: In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix lockup on tx to unregistering netdev with carrier Commit in a fixes tag…
PriorityP422medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.20%
10.1th percentile
In the Linux kernel, the following vulnerability has been resolved:
openvswitch: fix lockup on tx to unregistering netdev with carrier
Commit in a fixes tag attempted to fix the issue in the following
sequence of calls:
do_output
-> ovs_vport_send
-> dev_queue_xmit
-> __dev_queue_xmit
-> netdev_core_pick_tx
-> skb_tx_hash
When device is unregistering, the 'dev->real_num_tx_queues' goes to
zero and the 'while (unlikely(hash >= qcount))' loop inside the
'skb_tx_hash' becomes infinite, locking up the core forever.
But unfortunately, checking just the carrier status is not enough to
fix the issue, because some devices may still be in unregistering
state while reporting carrier status OK.
One example of such device is a net/dummy. It sets carrier ON
on start, but it doesn't implement .ndo_stop to set the carrier off.
And it makes sense, because dummy doesn't really have a carrier.
Therefore, while this device is unregistering, it's still easy to hit
the infinite loop in the skb_tx_hash() from the OVS datapath. There
might be other drivers that do the same, but dummy by itself is
important for the OVS ecosystem, because it is frequently used as a
packet sink for tcpdump while debugging OVS deployments. And when the
issue is hit, the only way to recover is to reboot.
Fix that by also checking if the device is running. The running
state is handled by the net core during unregistering, so it covers
unregistering case better, and we don't really need to send packets
to devices that are not running anyway.
While only checking the running state might be enough, the carrier
check is preserved. The running and the carrier states seem disjoined
throughout the code and different drivers. And other core functions
like __dev_direct_xmit() check both before attempting to transmit
a packet. So, it seems safer to check both flags in OVS as well.
Affected
21 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.1.128-1 (bookworm) | linux 6.1.128-1 (bookworm) |
| debian | linux-6.1 | < linux 6.1.128-1 (bookworm) | linux 6.1.128-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | >= 066b86787fa3d97b7aefb5ac0a99a22dad2d15f8 < ea966b6698785fb9cd0fdb867acd91b222e4723f | ea966b6698785fb9cd0fdb867acd91b222e4723f |
| linux | linux | >= 066b86787fa3d97b7aefb5ac0a99a22dad2d15f8 < 82f433e8dd0629e16681edf6039d094b5518d8ed | 82f433e8dd0629e16681edf6039d094b5518d8ed |
| linux | linux | >= 066b86787fa3d97b7aefb5ac0a99a22dad2d15f8 < 47e55e4b410f7d552e43011baa5be1aab4093990 | 47e55e4b410f7d552e43011baa5be1aab4093990 |
| linux | linux | >= 284be5db6c8d06d247ed056cfc448c4f79bbb16c < 87fcf0d137c770e6040ebfdb0abd8e7dd481b504 | 87fcf0d137c770e6040ebfdb0abd8e7dd481b504 |
| linux | linux | >= 5efcb301523baacd98a47553d4996e924923114d < 930268823f6bccb697aa5d2047aeffd4a497308c | 930268823f6bccb697aa5d2047aeffd4a497308c |
| linux | linux | >= 6.1.25 < 6.1.127 | 6.1.127 |
| linux | linux | >= 6.2.12 < 6.3 | 6.3 |
| linux | linux | >= 644b3051b06ba465bc7401bfae9b14963cbc8c1c < ea9e990356b7bee95440ba0e6e83cc4d701afaca | ea9e990356b7bee95440ba0e6e83cc4d701afaca |
| linux | linux | >= 9b0dd09c1ceb35950d2884848099fccc9ec9a123 < b5c73fc92f8d15c16e5dc87b5c17d2abf1e6d092 | b5c73fc92f8d15c16e5dc87b5c17d2abf1e6d092 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 6.1.128-1 | 6.1.128-1 |
| linux | linux_kernel | >= 0 < 6.12.11-1 | 6.12.11-1 |
| linux | linux_kernel | >= 0 < 6.12.11-1 | 6.12.11-1 |
| linux | linux_kernel | >= 0 < 6.8.0-62.65 | 6.8.0-62.65 |
| linux | linux_kernel | >= 6.1.25 < 6.1.127 | 6.1.127 |
| linux | linux_kernel | >= 6.2.12 < 6.6.74 | 6.6.74 |
| linux | linux_kernel | >= 6.7 < 6.12.11 | 6.12.11 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.9MEDIUM
vendor_ubuntu5.9MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- GPIO subsystem;
- GPU drivers;
- InfiniBand drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- i.MX PM domains;
- SCSI subsystem;
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Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- GPIO subsystem;
- GPU drivers;
- InfiniBand drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- i.MX PM domains;
- SCSI subsystem;
- USB Serial drivers;
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It was discovered that the CIFS network file system implementation in the
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upcalls. An attacker could use this to expose sensitive information.
(CVE-2025-2312)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- GPIO subsystem;
- GPU drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- x86 platform drivers;
- i.MX PM domains;
- SCSI subsystem;
- USB Serial drivers;
- AFS file system;
- GFS2 file system;
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Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- GPIO subsystem;
- GPU drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- x86 platform drivers;
- i.MX PM domains;
- SCSI subsystem;
- USB Serial drivers;
- AFS file system;
- GFS2 file system;
- File systems infrastructure;
- Proc file system;
- SMB network file system;
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Red Hat
kernel: openvswitch: fix lockup on tx to unregistering netdev with carrier
vendor_redhat·2025-01-31·CVSS 5.5
CVE-2025-21681 [MEDIUM] CWE-835 kernel: openvswitch: fix lockup on tx to unregistering netdev with carrier
kernel: openvswitch: fix lockup on tx to unregistering netdev with carrier
In the Linux kernel, the following vulnerability has been resolved:
openvswitch: fix lockup on tx to unregistering netdev with carrier
Commit in a fixes tag attempted to fix the issue in the following
sequence of calls:
do_output
-> ovs_vport_send
-> dev_queue_xmit
-> __dev_queue_xmit
-> netdev_core_pick_tx
-> skb_tx_hash
When device is unregistering, the 'dev->real_num_tx_queues' goes to
zero and the 'while (unlikely(hash >= qcount))' loop inside the
'skb_tx_hash' becomes infinite, locking up the core forever.
But unfortunately, checking just the carrier status is not enough to
fix the issue, because some devices may still be in unregistering
state while reporting carrier status OK.
One example of such device is a
Debian
CVE-2025-21681: linux - In the Linux kernel, the following vulnerability has been resolved: openvswitch...
vendor_debian·2025·CVSS 5.5
CVE-2025-21681 [MEDIUM] CVE-2025-21681: linux - In the Linux kernel, the following vulnerability has been resolved: openvswitch...
In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix lockup on tx to unregistering netdev with carrier Commit in a fixes tag attempted to fix the issue in the following sequence of calls: do_output -> ovs_vport_send -> dev_queue_xmit -> __dev_queue_xmit -> netdev_core_pick_tx -> skb_tx_hash When device is unregistering, the 'dev->real_num_tx_queues' goes to zero and the 'while (unlikely(hash >= qcount))' loop inside the 'skb_tx_hash' becomes infinite, locking up the core forever. But unfortunately, checking just the carrier status is not enough to fix the issue, because some devices may still be in unregistering state while reporting carrier status OK. One example of such device is a net/dummy. It sets carrier ON on start, but it doesn't implement .ndo_stop
OSV
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It was discovered that the CIFS network file system implementation in the
Linux kernel did not properly verify the target namespace when handling
upcalls. An attacker could use this to expose sensitive information.
(CVE-2025-2312)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- PowerPC architecture;
- S390 architecture;
- Block layer subsystem;
- Serial ATA and Parallel ATA drivers;
- Drivers core;
- Network block device driver;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- FireWire subsystem;
- GPIO subsystem;
- GPU drivers;
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It was discovered that the CIFS network file system implementation in the
Linux kernel did not properly verify the target namespace when handling
upcalls. An attacker could use this to expose sensitive information.
(CVE-2025-2312)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- GPIO subsystem;
- GPU drivers;
- InfiniBand drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- i.MX PM domains;
- SCSI subsystem;
- USB Serial drivers;
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It was discovered that the CIFS network file system implementation in the
Linux kernel did not properly verify the target namespace when handling
upcalls. An attacker could use this to expose sensitive information.
(CVE-2025-2312)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- GPIO subsystem;
- GPU drivers;
- InfiniBand drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- i.MX PM domains;
- SCSI subsystem;
- USB Serial drivers;
- AFS file system;
- GFS2 file system;
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It was discovered that the CIFS network file system implementation in the
Linux kernel did not properly verify the target namespace when handling
upcalls. An attacker could use this to expose sensitive information.
(CVE-2025-2312)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- GPIO subsystem;
- GPU drivers;
- InfiniBand drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- i.MX PM domains;
- SCSI subsystem;
- USB Serial drivers;
- AFS file system;
- GFS2 file system;
- File systems infrastructure;
- File system notification infrastructure;
- Overlay file system;
- Proc file system;
- SMB network
OSV
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[MEDIUM] linux-azure-nvidia vulnerabilities
linux-azure-nvidia vulnerabilities
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- GPIO subsystem;
- GPU drivers;
- InfiniBand drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- i.MX PM domains;
- SCSI subsystem;
- USB Serial drivers;
- AFS file system;
- GFS2 file system;
- File systems infrastructure;
- File system notification infrastructure;
- Overlay file system;
- Proc file system;
- SMB network file system;
- Timer subsystem;
- Kernel CPU control infrastructure;
- Memory management;
- Networking core;
- DCCP (Datagram Congestion Control Protocol);
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- IEEE 802.15.4 subsystem;
- Open vSwitch;
- Network traff
OSV
linux, linux-aws, linux-aws-6.8, linux-gke, linux-gkeop, linux-ibm, linux-lowlatency, linux-lowlatency-hwe-6.8, linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency, linux-oem-6.8 vulnerabilities
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CVE-2025-2312 [MEDIUM] linux, linux-aws, linux-aws-6.8, linux-gke, linux-gkeop, linux-ibm, linux-lowlatency, linux-lowlatency-hwe-6.8, linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency, linux-oem-6.8 vulnerabilities
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It was discovered that the CIFS network file system implementation in the
Linux kernel did not properly verify the target namespace when handling
upcalls. An attacker could use this to expose sensitive information.
(CVE-2025-2312)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- GPIO subsystem;
- GPU drivers;
- InfiniBand drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- i.MX PM domains;
- SCSI subsystem;
- USB Serial drivers;
- AFS f
OSV
linux-azure, linux-azure-6.8 vulnerabilities
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[MEDIUM] linux-azure, linux-azure-6.8 vulnerabilities
linux-azure, linux-azure-6.8 vulnerabilities
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- GPIO subsystem;
- GPU drivers;
- InfiniBand drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- i.MX PM domains;
- SCSI subsystem;
- USB Serial drivers;
- AFS file system;
- GFS2 file system;
- File systems infrastructure;
- File system notification infrastructure;
- Overlay file system;
- Proc file system;
- SMB network file system;
- Timer subsystem;
- Kernel CPU control infrastructure;
- Memory management;
- Networking core;
- DCCP (Datagram Congestion Control Protocol);
- IPv6 networking;
- IEEE 802.15.4 subsystem;
- Open vSwitch;
- Net
OSV
linux-realtime vulnerabilities
osv·2025-06-24·CVSS 5.5
CVE-2025-2312 [MEDIUM] linux-realtime vulnerabilities
linux-realtime vulnerabilities
It was discovered that the CIFS network file system implementation in the
Linux kernel did not properly verify the target namespace when handling
upcalls. An attacker could use this to expose sensitive information.
(CVE-2025-2312)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- GPIO subsystem;
- GPU drivers;
- InfiniBand drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- i.MX PM domains;
- SCSI subsystem;
- USB Serial drivers;
- AFS file system;
- GFS2 file system;
- File systems infrastructure;
- File system notification infrastructure;
- Overlay file system;
- Proc file system;
- SMB network file
OSV
linux, linux-aws, linux-gcp, linux-hwe-6.11, linux-lowlatency, linux-lowlatency-hwe-6.11, linux-oem-6.11, linux-oracle, linux-raspi, linux-realtime vulnerabilities
osv·2025-04-23·CVSS 5.5
[MEDIUM] linux, linux-aws, linux-gcp, linux-hwe-6.11, linux-lowlatency, linux-lowlatency-hwe-6.11, linux-oem-6.11, linux-oracle, linux-raspi, linux-realtime vulnerabilities
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Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- GPIO subsystem;
- GPU drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- x86 platform drivers;
- i.MX PM domains;
- SCSI subsystem;
- USB Serial drivers;
- AFS file system;
- GFS2 file system;
- File systems infrastructure;
- Proc file system;
- SMB network file system;
- Timer subsystem;
- Kernel CPU control infrastructure;
- Memory management;
- Networking core;
- Ethtool driver;
- IEEE 802.15.4 subsystem;
- Open vSwitch
OSV
linux-azure, linux-azure-6.11 vulnerabilities
osv·2025-04-23·CVSS 5.5
CVE-2025-2312 [MEDIUM] linux-azure, linux-azure-6.11 vulnerabilities
linux-azure, linux-azure-6.11 vulnerabilities
It was discovered that the CIFS network file system implementation in the
Linux kernel did not properly verify the target namespace when handling
upcalls. An attacker could use this to expose sensitive information.
(CVE-2025-2312)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- GPIO subsystem;
- GPU drivers;
- IRQ chip drivers;
- Network drivers;
- Mellanox network drivers;
- x86 platform drivers;
- i.MX PM domains;
- SCSI subsystem;
- USB Serial drivers;
- AFS file system;
- GFS2 file system;
- File systems infrastructure;
- Proc file system;
- SMB network file system;
- Timer subsystem;
- Kernel CPU control i
GHSA
GHSA-2x4f-r6q9-v77h: In the Linux kernel, the following vulnerability has been resolved:
openvswitch: fix lockup on tx to unregistering netdev with carrier
Commit in a f
ghsa_unreviewed·2025-01-31
CVE-2025-21681 [MEDIUM] CWE-835 GHSA-2x4f-r6q9-v77h: In the Linux kernel, the following vulnerability has been resolved:
openvswitch: fix lockup on tx to unregistering netdev with carrier
Commit in a f
In the Linux kernel, the following vulnerability has been resolved:
openvswitch: fix lockup on tx to unregistering netdev with carrier
Commit in a fixes tag attempted to fix the issue in the following
sequence of calls:
do_output
-> ovs_vport_send
-> dev_queue_xmit
-> __dev_queue_xmit
-> netdev_core_pick_tx
-> skb_tx_hash
When device is unregistering, the 'dev->real_num_tx_queues' goes to
zero and the 'while (unlikely(hash >= qcount))' loop inside the
'skb_tx_hash' becomes infinite, locking up the core forever.
But unfortunately, checking just the carrier status is not enough to
fix the issue, because some devices may still be in unregistering
state while reporting carrier status OK.
One example of such device is a net/dummy. It sets carrier ON
on start, but it doesn't implement .ndo
OSV
CVE-2025-21681: In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix lockup on tx to unregistering netdev with carrier Commit in a fix
osv·2025-01-31·CVSS 5.5
CVE-2025-21681 [MEDIUM] CVE-2025-21681: In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix lockup on tx to unregistering netdev with carrier Commit in a fix
In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix lockup on tx to unregistering netdev with carrier Commit in a fixes tag attempted to fix the issue in the following sequence of calls: do_output -> ovs_vport_send -> dev_queue_xmit -> __dev_queue_xmit -> netdev_core_pick_tx -> skb_tx_hash When device is unregistering, the 'dev->real_num_tx_queues' goes to zero and the 'while (unlikely(hash >= qcount))' loop inside the 'skb_tx_hash' becomes infinite, locking up the core forever. But unfortunately, checking just the carrier status is not enough to fix the issue, because some devices may still be in unregistering state while reporting carrier status OK. One example of such device is a net/dummy. It sets carrier ON on start, but it doesn't implement .ndo_stop
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/47e55e4b410f7d552e43011baa5be1aab4093990https://git.kernel.org/stable/c/82f433e8dd0629e16681edf6039d094b5518d8edhttps://git.kernel.org/stable/c/87fcf0d137c770e6040ebfdb0abd8e7dd481b504https://git.kernel.org/stable/c/930268823f6bccb697aa5d2047aeffd4a497308chttps://git.kernel.org/stable/c/b5c73fc92f8d15c16e5dc87b5c17d2abf1e6d092https://git.kernel.org/stable/c/ea966b6698785fb9cd0fdb867acd91b222e4723fhttps://git.kernel.org/stable/c/ea9e990356b7bee95440ba0e6e83cc4d701afacahttps://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
2025-01-31
Published