Improper Validation of Specified Quantity in Input in Linux kernel - CVE-2026-80844
Published: September 5, 2026
Vulnerability identifier: #VU147067
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80844
CWE-ID: CWE-1284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause an out-of-bounds memory access.
The vulnerability exists due to improper validation of routing header segments_left values in ipv6_rearrange_rthdr() when processing raw IPv6 HDRINCL packets with a segments_left value larger than the number of addresses described by hdrlen. A local user can send a crafted packet with an oversized segments_left value to cause an out-of-bounds memory access.
Affected software
Linux kernel
How to mitigate CVE-2026-80844
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/0bf11081ad3753938a2b48723ce6298dbac743a1
- https://git.kernel.org/stable/c/1516e31ac458a738be485620579d8f7fb2700fcb
- https://git.kernel.org/stable/c/1b7e066eabcc7d6d8f476c34739b45932f2f4c31
- https://git.kernel.org/stable/c/2dc650956e4e163b879b3fb1027f9557abc5c985
- https://git.kernel.org/stable/c/46640c814f25f096b0b0045ca50e1b7030cd8a30
- https://git.kernel.org/stable/c/48b0e36cf54358276ee7aa897034c973097d2bc9
- https://git.kernel.org/stable/c/6733ae71268a27d598cfb3f3339a3c950b9b656d
- https://git.kernel.org/stable/c/7bad4bda74dc4713f398d3b7624ff05478e3a568
- https://git.kernel.org/stable/c/f00df8500e5a36ba70d336fd34bd2152ea074e5f