Out-of-bounds write in Linux kernel - CVE-2026-43501
Published: May 22, 2026
Vulnerability identifier: #VU132123
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43501
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in ipv6_rpl_srh_rcv() and skb_mac_header_rebuild() when processing a crafted IPv6 packet with a recompressed type-3 source routing header. A local user can send a specially crafted raw IPv6 packet to trigger an out-of-bounds write and cause a denial of service.
Exploitation requires the ability to send an AF_INET6 SOCK_RAW packet with IPV6_HDRINCL over the loopback interface.
How to mitigate CVE-2026-43501
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/4babc2d9fda2df43823b85d08a0180b68f1b0854
- https://git.kernel.org/stable/c/7398ebefbfd4f8a31d4f665a4213302fa995494b
- https://git.kernel.org/stable/c/8e8be63465a5e80394c70324603dfea1bfdad48f
- https://git.kernel.org/stable/c/9e6bf146b55999a095bb14f73a843942456d1adc
- https://git.kernel.org/stable/c/c261d07a80576dc8ccf394ef8f074f8c67a06b37