CVE-2026-43501
published 2026-05-21CVE-2026-43501: In the Linux kernel, the following vulnerability has been resolved: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows ipv6_rpl_srh_rcv()…
PriorityP351critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.60%
44.9th percentile
In the Linux kernel, the following vulnerability has been resolved:
ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
ipv6_rpl_srh_rcv() decompresses an RFC 6554 Source Routing Header, swaps
the next segment into ipv6_hdr->daddr, recompresses, then pulls the old
header and pushes the new one plus the IPv6 header back. The
recompressed header can be larger than the received one when the swap
reduces the common-prefix length the segments share with daddr (CmprI=0,
CmprE>0, seg[0][0] != daddr[0] gives the maximum +8 bytes).
pskb_expand_head() was gated on segments_left == 0, so on earlier
segments the push consumed unchecked headroom. Once skb_push() leaves
fewer than skb->mac_len bytes in front of data,
skb_mac_header_rebuild()'s call to:
skb_set_mac_header(skb, -skb->mac_len);
will store (data - head) - mac_len into the u16 mac_header field, which
wraps to ~65530, and the following memmove() writes mac_len bytes ~64KiB
past skb->head.
A single AF_INET6/SOCK_RAW/IPV6_HDRINCL packet over lo with a two
segment type-3 SRH (CmprI=0, CmprE=15) reaches headroom 8 after one
pass; KASAN reports a 14-byte OOB write in ipv6_rthdr_rcv.
Fix this by expanding the head whenever the remaining room is less than
the push size plus mac_len, and request that much extra so the rebuilt
MAC header fits afterwards.
Affected
65 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < bde199c72d319a4e207f88daabc888317504e2fb | bde199c72d319a4e207f88daabc888317504e2fb |
| linux | linux | >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < be1fa0aa9b4fdd5a8b7a61ba520a690a68391e6e | be1fa0aa9b4fdd5a8b7a61ba520a690a68391e6e |
| linux | linux | >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < 0a9e8053f1f8a8e1bfc1dd61ffe67be6c1180402 | 0a9e8053f1f8a8e1bfc1dd61ffe67be6c1180402 |
| linux | linux | >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < 8e8be63465a5e80394c70324603dfea1bfdad48f | 8e8be63465a5e80394c70324603dfea1bfdad48f |
| linux | linux | >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < 4babc2d9fda2df43823b85d08a0180b68f1b0854 | 4babc2d9fda2df43823b85d08a0180b68f1b0854 |
| linux | linux | >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < c261d07a80576dc8ccf394ef8f074f8c67a06b37 | c261d07a80576dc8ccf394ef8f074f8c67a06b37 |
| linux | linux | >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < 7398ebefbfd4f8a31d4f665a4213302fa995494b | 7398ebefbfd4f8a31d4f665a4213302fa995494b |
| linux | linux | >= 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 < 9e6bf146b55999a095bb14f73a843942456d1adc | 9e6bf146b55999a095bb14f73a843942456d1adc |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 5.11 < 5.15.209 | 5.15.209 |
| linux | linux_kernel | >= 5.16 < 6.1.175 | 6.1.175 |
| linux | linux_kernel | >= 5.7 < 5.10.258 | 5.10.258 |
| linux | linux_kernel | >= 6.13 < 6.18.27 | 6.18.27 |
| linux | linux_kernel | >= 6.19 < 7.0.4 | 7.0.4 |
| linux | linux_kernel | >= 6.2 < 6.6.140 | 6.6.140 |
| linux | linux_kernel | >= 6.7 < 6.12.86 | 6.12.86 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-5.15 | — | — |
| ubuntu | linux-aws-6.8 | — | — |
| ubuntu | linux-aws-fips | — | — |
| ubuntu | linux-azure | — | — |
| ubuntu | linux-azure-5.15 | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_ubuntu8.8HIGH
vendor_redhat7.0HIGH
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- InfiniBand drivers;
- STMicroelectronics network drivers;
- Network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
- File systems infrastructure;
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- Network file system (NFS) server daemon;
- SMB network file system;
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- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
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- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
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An attacker could possibly use these to compromise the system.
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- ARM64 architecture;
- x86 architecture;
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- Network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
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attacker could use this to expose sensitive information. (CVE-2025-54505)
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:
- ARM64 architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- Rados block device (RBD) driver;
- Compressed RAM block device driver;
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An attacker could possibly use these to compromise the system.
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- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
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This update corrects flaws in the following subsystems:
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- IOMMU subsystem;
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- STMicroelectronics network drivers;
- NVME drivers;
- x86 platform drivers;
- SCSI subsystem;
- SPI subsystem;
- TCM subsystem;
- USB over IP driver;
- File systems infrastructure;
- HFS+ file system;
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Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel did not properly handle shared page
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Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
container. (CVE-2026-43284, CVE-2026-43500, CVE-2026-45998, CVE-2026-46000)
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Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
handle in-place cryptographic operations. This flaw is known as Copy Fail.
A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)
It was discovered that the Linux kernel did not properly handle shared page
fragments during socket buffer operations, collectively known as Dirty
Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
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Summary: Several security issues were fixed in the Linux kernel.
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Hardwar
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CVE-2025-68214 [MEDIUM] Linux kernel vulnerabilities
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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:
- RISC-V architecture;
- Cryptographic API;
- InfiniBand drivers;
- IOMMU subsystem;
- Network drivers;
- STMicroelectronics network drivers;
- NVME drivers;
- x86 platform drivers;
- SCSI subsystem;
- SPI subsystem;
- TCM subsystem;
- USB over IP driver;
- File systems infrastructure;
- HFS+ file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- IPv6 networking;
- Tracing infrastructure;
- Timer subsystem;
- B.A.T.M.A.N. meshing protocol;
- Bluetooth subsystem;
- Ethernet bridge;
-
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CVE-2026-46042 [LOW] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
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:
- ARM64 architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- Rados block device (RBD) driver;
- Compressed RAM block device driver;
- Character device driver;
- TPM device driver;
- Hardware crypto device drivers;
- EDAC drivers;
- GPU drivers;
- Greybus drivers;
- HID
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Linux kernel vulnerabilities
vendor_ubuntu·2026-07-01
CVE-2026-43226 Linux kernel vulnerabilities
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:
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Hardware monitoring dr
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vendor_ubuntu·2026-07-01·CVSS 7.1
CVE-2026-43304 [HIGH] Linux kernel (OEM) vulnerabilities
Title: Linux kernel (OEM) 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:
- ARM64 architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- DMA engine subsystem;
- InfiniBand drivers;
- STMicroelectronics network drivers;
- Network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
- File systems infrastructure;
- Ext4 file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- Kernel thread helper (kthread);
- IPv6 networking;
- Tracing infrastructure;
- Kernel exit() syscall;
- Scatterlist API;
- B.A.T.M.A.N. meshi
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vendor_ubuntu·2026-07-01·CVSS 7.1
CVE-2026-43304 [HIGH] Linux kernel vulnerabilities
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:
- ARM64 architecture;
- Block layer subsystem;
- Cryptographic API;
- DMA engine subsystem;
- InfiniBand drivers;
- STMicroelectronics network drivers;
- Network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
- File systems infrastructure;
- Ext4 file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- Kernel thread helper (kthread);
- IPv6 networking;
- Tracing infrastructure;
- Kernel exit() syscall;
- Scatterlist API;
- B.A.T.M.A.N. meshing protocol;
- Ethernet br
Ubuntu
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vendor_ubuntu·2026-07-01·CVSS 8.8
CVE-2026-46042 [HIGH] Linux kernel (OEM) vulnerabilities
Title: Linux kernel (OEM) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel did not properly handle shared page
fragments during socket buffer operations, collectively known as Dirty
Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
container. (CVE-2026-43284, CVE-2026-43500, CVE-2026-45998, CVE-2026-46000)
It was discovered that a logic flaw existed in the XFRM ESP-in-TCP
subsystem in the Linux kernel when handling socket buffer fragments. This
flaw is known as Fragnesia. A local attacker could use this to escalate
privileges, or possibly escape a container. (C
Red Hat
kernel: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
vendor_redhat·2026-05-21·CVSS 7.0
CVE-2026-43501 [HIGH] CWE-131 kernel: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
kernel: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
A flaw was found in the Linux kernel. A local attacker can exploit an out-of-bounds write vulnerability when the kernel recomputes an IPv6 Source Routing Header (SRH). This issue occurs because insufficient headroom is reserved during the recompression process, leading to memory corruption. Successful exploitation could result in a denial of service or potentially arbitrary code execution.
Package: kernel (Red Hat Enterprise Linux 10) - Affected
Package: kernel (Red Hat Enterprise Linux 6) - Under investigation
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Not affected
Package: kernel (Red Hat Enterprise Linux 8) - Not affected
Package: kernel-rt (R
GHSA
GHSA-fqx3-r8j8-73qq: In the Linux kernel, the following vulnerability has been resolved:
ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
ipv6_rpl_srh_rcv
ghsa_unreviewed·2026-05-21
CVE-2026-43501 GHSA-fqx3-r8j8-73qq: In the Linux kernel, the following vulnerability has been resolved:
ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
ipv6_rpl_srh_rcv
In the Linux kernel, the following vulnerability has been resolved:
ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
ipv6_rpl_srh_rcv() decompresses an RFC 6554 Source Routing Header, swaps
the next segment into ipv6_hdr->daddr, recompresses, then pulls the old
header and pushes the new one plus the IPv6 header back. The
recompressed header can be larger than the received one when the swap
reduces the common-prefix length the segments share with daddr (CmprI=0,
CmprE>0, seg[0][0] != daddr[0] gives the maximum +8 bytes).
pskb_expand_head() was gated on segments_left == 0, so on earlier
segments the push consumed unchecked headroom. Once skb_push() leaves
fewer than skb->mac_len bytes in front of data,
skb_mac_header_rebuild()'s call to:
skb_set_mac_header(skb, -skb->mac_l
VulDB
Linux Kernel up to 7.1-rc1 RFC 6554 Source Routing Header ipv6_rpl_srh_rcv out-of-bounds write
vuldb·2026-05-21
CVE-2026-43501 [CRITICAL] Linux Kernel up to 7.1-rc1 RFC 6554 Source Routing Header ipv6_rpl_srh_rcv out-of-bounds write
A vulnerability classified as critical has been found in Linux Kernel up to 6.6.139/6.12.85/6.18.26/7.0.3/7.1-rc1. Impacted is the function ipv6_rpl_srh_rcv of the component RFC 6554 Source Routing Header Handler. Performing a manipulation results in out-of-bounds write.
This vulnerability is reported as CVE-2026-43501. The attacker must have access to the local network to execute the attack. No exploit exists.
It is recommended to upgrade the affected component.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-43501 kernel: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
bugzilla·2026-05-21
CVE-2026-43501 [HIGH] CVE-2026-43501 kernel: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
CVE-2026-43501 kernel: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
In the Linux kernel, the following vulnerability has been resolved:
ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
ipv6_rpl_srh_rcv() decompresses an RFC 6554 Source Routing Header, swaps
the next segment into ipv6_hdr->daddr, recompresses, then pulls the old
header and pushes the new one plus the IPv6 header back. The
recompressed header can be larger than the received one when the swap
reduces the common-prefix length the segments share with daddr (CmprI=0,
CmprE>0, seg[0][0] != daddr[0] gives the maximum +8 bytes).
pskb_expand_head() was gated on segments_left == 0, so on earlier
segments the push consumed unchecked headroom. Once skb_push() leaves
fewer than skb->mac_len bytes in
Bugzilla
CVE-2025-43501 webkit2gtk4.0: Processing maliciously crafted web content may lead to an unexpected process crash [fedora-42]
bugzilla·2025-12-17·CVSS 4.3
CVE-2025-43501 [MEDIUM] CVE-2025-43501 webkit2gtk4.0: Processing maliciously crafted web content may lead to an unexpected process crash [fedora-42]
CVE-2025-43501 webkit2gtk4.0: Processing maliciously crafted web content may lead to an unexpected process crash [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It
https://git.kernel.org/stable/c/0a9e8053f1f8a8e1bfc1dd61ffe67be6c1180402https://git.kernel.org/stable/c/4babc2d9fda2df43823b85d08a0180b68f1b0854https://git.kernel.org/stable/c/7398ebefbfd4f8a31d4f665a4213302fa995494bhttps://git.kernel.org/stable/c/8e8be63465a5e80394c70324603dfea1bfdad48fhttps://git.kernel.org/stable/c/9e6bf146b55999a095bb14f73a843942456d1adchttps://git.kernel.org/stable/c/bde199c72d319a4e207f88daabc888317504e2fbhttps://git.kernel.org/stable/c/be1fa0aa9b4fdd5a8b7a61ba520a690a68391e6ehttps://git.kernel.org/stable/c/c261d07a80576dc8ccf394ef8f074f8c67a06b37https://access.redhat.com/errata/RHSA-2026:25191https://access.redhat.com/errata/RHSA-2026:25217https://access.redhat.com/errata/RHSA-2026:27713https://access.redhat.com/errata/RHSA-2026:27731https://access.redhat.com/errata/RHSA-2026:33900https://access.redhat.com/errata/RHSA-2026:34094https://access.redhat.com/errata/RHSA-2026:34095https://access.redhat.com/security/cve/CVE-2026-43501https://bugzilla.redhat.com/show_bug.cgi?id=2480457https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43501.json
2026-05-21
Published