CVE-2021-46981
published 2024-02-28CVE-2021-46981: In the Linux kernel, the following vulnerability has been resolved: nbd: Fix NULL pointer in flush_workqueue Open /dev/nbdX first, the config_refs will be 1…
PriorityP420medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.25%
16.4th percentile
In the Linux kernel, the following vulnerability has been resolved:
nbd: Fix NULL pointer in flush_workqueue
Open /dev/nbdX first, the config_refs will be 1 and
the pointers in nbd_device are still null. Disconnect
/dev/nbdX, then reference a null recv_workq. The
protection by config_refs in nbd_genl_disconnect is useless.
[ 656.366194] BUG: kernel NULL pointer dereference, address: 0000000000000020
[ 656.368943] #PF: supervisor write access in kernel mode
[ 656.369844] #PF: error_code(0x0002) - not-present page
[ 656.370717] PGD 10cc87067 P4D 10cc87067 PUD 1074b4067 PMD 0
[ 656.371693] Oops: 0002 [#1] SMP
[ 656.372242] CPU: 5 PID: 7977 Comm: nbd-client Not tainted 5.11.0-rc5-00040-g76c057c84d28 #1
[ 656.373661] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc31 04/01/2014
[ 656.375904] RIP: 0010:mutex_lock+0x29/0x60
[ 656.376627] Code: 00 0f 1f 44 00 00 55 48 89 fd 48 83 05 6f d7 fe 08 01 e8 7a c3 ff ff 48 83 05 6a d7 fe 08 01 31 c0 65 48 8b 14 25 00 6d 01 00 48 0f b1 55 d
[ 656.378934] RSP: 0018:ffffc900005eb9b0 EFLAGS: 00010246
[ 656.379350] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 656.379915] RDX: ffff888104cf2600 RSI: ffffffffaae8f452 RDI: 0000000000000020
[ 656.380473] RBP: 0000000000000020 R08: 0000000000000000 R09: ffff88813bd6b318
[ 656.381039] R10: 00000000000000c7 R11: fefefefefefefeff R12: ffff888102710b40
[ 656.381599] R13: ffffc900005eb9e0 R14: ffffffffb2930680 R15: ffff88810770ef00
[ 656.382166] FS: 00007fdf117ebb40(0000) GS:ffff88813bd40000(0000) knlGS:0000000000000000
[ 656.382806] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 656.383261] CR2: 0000000000000020 CR3: 0000000100c84000 CR4: 00000000000006e0
[ 656.383819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 656.384370] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 656.384927] Call Trace:
[ 656.385111] flush_workqueue+0x92/0x6c0
[ 656.385395] n
Affected
23 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.10.38-1 (bookworm) | linux 5.10.38-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | >= 4.14.149 < 4.15 | 4.15 |
| linux | linux | >= 4.19.79 < 4.20 | 4.20 |
| linux | linux | >= 5.3.6 < 5.4 | 5.4 |
| linux | linux | >= e9e006f5fcf2bab59149cb38a48a4817c1b538b4 < 1c4962df938891af9ab4775f5224ef8601764107 | 1c4962df938891af9ab4775f5224ef8601764107 |
| linux | linux | >= e9e006f5fcf2bab59149cb38a48a4817c1b538b4 < cde4b55cfb24522dcbba80bbdb0c082303e76c43 | cde4b55cfb24522dcbba80bbdb0c082303e76c43 |
| linux | linux | >= e9e006f5fcf2bab59149cb38a48a4817c1b538b4 < b31d237796fd618379ec8e0f4de3370b5e4aeee7 | b31d237796fd618379ec8e0f4de3370b5e4aeee7 |
| linux | linux | >= e9e006f5fcf2bab59149cb38a48a4817c1b538b4 < 54b78ba7e96e5fe1edb8054e375d31a6c0dc60dc | 54b78ba7e96e5fe1edb8054e375d31a6c0dc60dc |
| linux | linux | >= e9e006f5fcf2bab59149cb38a48a4817c1b538b4 < 79ebe9110fa458d58f1fceb078e2068d7ad37390 | 79ebe9110fa458d58f1fceb078e2068d7ad37390 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 4.15.0-225.237 | 4.15.0-225.237 |
| linux | linux_kernel | >= 5.11 < 5.11.22 | 5.11.22 |
| linux | linux_kernel | >= 5.12 < 5.12.5 | 5.12.5 |
| linux | linux_kernel | >= 5.4 < 5.4.120 | 5.4.120 |
| linux | linux_kernel | >= 5.5 < 5.10.38 | 5.10.38 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
vendor_ubuntu5.5MEDIUM
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OSV
linux-aws-hwe vulnerabilities
osv·2024-05-23·CVSS 5.5
CVE-2023-47233 [MEDIUM] linux-aws-hwe vulnerabilities
linux-aws-hwe vulnerabilities
Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could possibly
use this to cause a denial of service (system crash). (CVE-2023-47233)
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:
- Block layer subsystem;
- Userspace I/O drivers;
- Ceph distributed file system;
- Ext4 file system;
- JFS file system;
- NILFS2 file system;
- Bluetooth subsystem;
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linux-gcp vulnerabilities
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CVE-2023-47233 [MEDIUM] linux-gcp vulnerabilities
linux-gcp vulnerabilities
Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could possibly
use this to cause a denial of service (system crash). (CVE-2023-47233)
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:
- Block layer subsystem;
- Userspace I/O drivers;
- Ceph distributed file system;
- Ext4 file system;
- JFS file system;
- NILFS2 file system;
- Bluetooth subsystem;
- Networking core;
- IPv4 networking;
- IPv6 networking;
- Logical Link layer;
- MAC80211 subsystem;
- Netlink;
- NFC subsystem;
- Tom
OSV
linux-azure vulnerabilities
osv·2024-05-20·CVSS 5.5
CVE-2023-47233 [MEDIUM] linux-azure vulnerabilities
linux-azure vulnerabilities
Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could possibly
use this to cause a denial of service (system crash). (CVE-2023-47233)
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:
- Block layer subsystem;
- Userspace I/O drivers;
- Ceph distributed file system;
- Ext4 file system;
- JFS file system;
- NILFS2 file system;
- Bluetooth subsystem;
- Networking core;
- IPv4 networking;
- IPv6 networking;
- Logical Link layer;
- MAC80211 subsystem;
- Netlink;
- NFC subsystem;
- T
OSV
linux, linux-aws, linux-azure-4.15, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle vulnerabilities
osv·2024-05-16·CVSS 5.5
CVE-2023-47233 [MEDIUM] linux, linux-aws, linux-azure-4.15, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle vulnerabilities
linux, linux-aws, linux-azure-4.15, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle vulnerabilities
Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could possibly
use this to cause a denial of service (system crash). (CVE-2023-47233)
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:
- Block layer subsystem;
- Userspace I/O drivers;
- Ceph distributed file system;
- Ext4 file system;
- JFS file system;
- NILFS2 file system;
- Bluetooth subsystem;
- Networking core;
- IPv4 networking;
- IPv6 networking;
GHSA
GHSA-xgg4-mwfh-3vj5: In the Linux kernel, the following vulnerability has been resolved:
nbd: Fix NULL pointer in flush_workqueue
Open /dev/nbdX first, the config_refs w
ghsa_unreviewed·2024-02-28
CVE-2021-46981 [MEDIUM] CWE-476 GHSA-xgg4-mwfh-3vj5: In the Linux kernel, the following vulnerability has been resolved:
nbd: Fix NULL pointer in flush_workqueue
Open /dev/nbdX first, the config_refs w
In the Linux kernel, the following vulnerability has been resolved:
nbd: Fix NULL pointer in flush_workqueue
Open /dev/nbdX first, the config_refs will be 1 and
the pointers in nbd_device are still null. Disconnect
/dev/nbdX, then reference a null recv_workq. The
protection by config_refs in nbd_genl_disconnect is useless.
[ 656.366194] BUG: kernel NULL pointer dereference, address: 0000000000000020
[ 656.368943] #PF: supervisor write access in kernel mode
[ 656.369844] #PF: error_code(0x0002) - not-present page
[ 656.370717] PGD 10cc87067 P4D 10cc87067 PUD 1074b4067 PMD 0
[ 656.371693] Oops: 0002 [#1] SMP
[ 656.372242] CPU: 5 PID: 7977 Comm: nbd-client Not tainted 5.11.0-rc5-00040-g76c057c84d28 #1
[ 656.373661] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_0738
OSV
CVE-2021-46981: In the Linux kernel, the following vulnerability has been resolved: nbd: Fix NULL pointer in flush_workqueue Open /dev/nbdX first, the config_refs wil
osv·2024-02-28·CVSS 5.5
CVE-2021-46981 [MEDIUM] CVE-2021-46981: In the Linux kernel, the following vulnerability has been resolved: nbd: Fix NULL pointer in flush_workqueue Open /dev/nbdX first, the config_refs wil
In the Linux kernel, the following vulnerability has been resolved: nbd: Fix NULL pointer in flush_workqueue Open /dev/nbdX first, the config_refs will be 1 and the pointers in nbd_device are still null. Disconnect /dev/nbdX, then reference a null recv_workq. The protection by config_refs in nbd_genl_disconnect is useless. [ 656.366194] BUG: kernel NULL pointer dereference, address: 0000000000000020 [ 656.368943] #PF: supervisor write access in kernel mode [ 656.369844] #PF: error_code(0x0002) - not-present page [ 656.370717] PGD 10cc87067 P4D 10cc87067 PUD 1074b4067 PMD 0 [ 656.371693] Oops: 0002 [#1] SMP [ 656.372242] CPU: 5 PID: 7977 Comm: nbd-client Not tainted 5.11.0-rc5-00040-g76c057c84d28 #1 [ 656.373661] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-
Ubuntu
Linux kernel (HWE) vulnerabilities
vendor_ubuntu·2024-05-23·CVSS 5.5
CVE-2024-26635 [MEDIUM] Linux kernel (HWE) vulnerabilities
Title: Linux kernel (HWE) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could possibly
use this to cause a denial of service (system crash). (CVE-2023-47233)
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:
- Block layer subsystem;
- Userspace I/O drivers;
- Ceph distributed file system;
- Ext4 file system;
- JFS file system;
- NILFS2 file system;
- Bluetooth subsystem;
- Networking core;
- IPv4 networking;
- IPv6 network
Ubuntu
Linux kernel (GCP) vulnerabilities
vendor_ubuntu·2024-05-21·CVSS 5.5
CVE-2024-26614 [MEDIUM] Linux kernel (GCP) vulnerabilities
Title: Linux kernel (GCP) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could possibly
use this to cause a denial of service (system crash). (CVE-2023-47233)
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:
- Block layer subsystem;
- Userspace I/O drivers;
- Ceph distributed file system;
- Ext4 file system;
- JFS file system;
- NILFS2 file system;
- Bluetooth subsystem;
- Networking core;
- IPv4 networking;
- IPv6 network
Ubuntu
Linux kernel (Azure) vulnerabilities
vendor_ubuntu·2024-05-20·CVSS 5.5
CVE-2023-47233 [MEDIUM] Linux kernel (Azure) vulnerabilities
Title: Linux kernel (Azure) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could possibly
use this to cause a denial of service (system crash). (CVE-2023-47233)
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:
- Block layer subsystem;
- Userspace I/O drivers;
- Ceph distributed file system;
- Ext4 file system;
- JFS file system;
- NILFS2 file system;
- Bluetooth subsystem;
- Networking core;
- IPv4 networking;
- IPv6 netwo
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2024-05-16·CVSS 5.5
CVE-2023-52524 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could possibly
use this to cause a denial of service (system crash). (CVE-2023-47233)
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:
- Block layer subsystem;
- Userspace I/O drivers;
- Ceph distributed file system;
- Ext4 file system;
- JFS file system;
- NILFS2 file system;
- Bluetooth subsystem;
- Networking core;
- IPv4 networking;
- IPv6 networking;
-
Red Hat
kernel: nbd: Fix NULL pointer in flush_workqueue
vendor_redhat·2024-02-28·CVSS 5.5
CVE-2021-46981 [MEDIUM] CWE-476 kernel: nbd: Fix NULL pointer in flush_workqueue
kernel: nbd: Fix NULL pointer in flush_workqueue
In the Linux kernel, the following vulnerability has been resolved:
nbd: Fix NULL pointer in flush_workqueue
Open /dev/nbdX first, the config_refs will be 1 and
the pointers in nbd_device are still null. Disconnect
/dev/nbdX, then reference a null recv_workq. The
protection by config_refs in nbd_genl_disconnect is useless.
[ 656.366194] BUG: kernel NULL pointer dereference, address: 0000000000000020
[ 656.368943] #PF: supervisor write access in kernel mode
[ 656.369844] #PF: error_code(0x0002) - not-present page
[ 656.370717] PGD 10cc87067 P4D 10cc87067 PUD 1074b4067 PMD 0
[ 656.371693] Oops: 0002 [#1] SMP
[ 656.372242] CPU: 5 PID: 7977 Comm: nbd-client Not tainted 5.11.0-rc5-00040-g76c057c84d28 #1
[ 656.373661] Hardware name: QEMU Standard
Debian
CVE-2021-46981: linux - In the Linux kernel, the following vulnerability has been resolved: nbd: Fix NU...
vendor_debian·2021·CVSS 5.5
CVE-2021-46981 [MEDIUM] CVE-2021-46981: linux - In the Linux kernel, the following vulnerability has been resolved: nbd: Fix NU...
In the Linux kernel, the following vulnerability has been resolved: nbd: Fix NULL pointer in flush_workqueue Open /dev/nbdX first, the config_refs will be 1 and the pointers in nbd_device are still null. Disconnect /dev/nbdX, then reference a null recv_workq. The protection by config_refs in nbd_genl_disconnect is useless. [ 656.366194] BUG: kernel NULL pointer dereference, address: 0000000000000020 [ 656.368943] #PF: supervisor write access in kernel mode [ 656.369844] #PF: error_code(0x0002) - not-present page [ 656.370717] PGD 10cc87067 P4D 10cc87067 PUD 1074b4067 PMD 0 [ 656.371693] Oops: 0002 [#1] SMP [ 656.372242] CPU: 5 PID: 7977 Comm: nbd-client Not tainted 5.11.0-rc5-00040-g76c057c84d28 #1 [ 656.373661] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/1c4962df938891af9ab4775f5224ef8601764107https://git.kernel.org/stable/c/54b78ba7e96e5fe1edb8054e375d31a6c0dc60dchttps://git.kernel.org/stable/c/79ebe9110fa458d58f1fceb078e2068d7ad37390https://git.kernel.org/stable/c/b31d237796fd618379ec8e0f4de3370b5e4aeee7https://git.kernel.org/stable/c/cde4b55cfb24522dcbba80bbdb0c082303e76c43https://git.kernel.org/stable/c/1c4962df938891af9ab4775f5224ef8601764107https://git.kernel.org/stable/c/54b78ba7e96e5fe1edb8054e375d31a6c0dc60dchttps://git.kernel.org/stable/c/79ebe9110fa458d58f1fceb078e2068d7ad37390https://git.kernel.org/stable/c/b31d237796fd618379ec8e0f4de3370b5e4aeee7https://git.kernel.org/stable/c/cde4b55cfb24522dcbba80bbdb0c082303e76c43
2024-02-28
Published