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CVE-2026-80844

Unknown

Last modified

CVE-2026-80844 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: xfrm: ah6: validate routing header segments_left AH6 rearranges routing-header addresses before computing or verifying the ICV. ipv6_rearrange_rthdr() assumes that segments_left is not larger than the number of addresses described by the routing header's hdrlen field. That assumption does not hold for raw IPv6 HDRINCL packets.

Description

In the Linux kernel, the following vulnerability has been resolved: xfrm: ah6: validate routing header segments_left AH6 rearranges routing-header addresses before computing or verifying the ICV. ipv6_rearrange_rthdr() assumes that segments_left is not larger than the number of addresses described by the routing header's hdrlen field. That assumption does not hold for raw IPv6 HDRINCL packets. A packet with hdrlen equal to 2 describes one address, but can carry an arbitrary segments_left value. With segments_left equal to 255, the function moves its address pointer 4,064 bytes backwards and passes a 4,064-byte length to memmove(), resulting in an out-of-bounds access. Validate the invariant locally before modifying the routing header or performing any address-pointer arithmetic, and propagate malformed-header errors to the existing AH6 input and output error paths.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2dc650956e4e163b879b3fb1027f9557abc5c985; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 48b0e36cf54358276ee7aa897034c973097d2bc9; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1b7e066eabcc7d6d8f476c34739b45932f2f4c31; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f00df8500e5a36ba70d336fd34bd2152ea074e5f; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1516e31ac458a738be485620579d8f7fb2700fcb; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6733ae71268a27d598cfb3f3339a3c950b9b656d; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 0bf11081ad3753938a2b48723ce6298dbac743a1; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 46640c814f25f096b0b0045ca50e1b7030cd8a30; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7bad4bda74dc4713f398d3b7624ff05478e3a568
LinuxLinux2.6.12

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-80844?
In the Linux kernel, the following vulnerability has been resolved: xfrm: ah6: validate routing header segments_left AH6 rearranges routing-header addresses before computing or verifying the ICV. ipv6_rearrange_rthdr() assumes that segments_left is not larger than the number of addresses described by the routing header's hdrlen field. That assumption does not hold for raw IPv6 HDRINCL packets. A packet with hdrlen equal to 2 describes one address, but can carry an arbitrary segments_left value. With segments_left equal to 255, the function moves its address pointer 4,064 bytes backwards and passes a 4,064-byte length to memmove(), resulting in an out-of-bounds access. Validate the invariant locally before modifying the routing header or performing any address-pointer arithmetic, and propagate malformed-header errors to the existing AH6 input and output error paths.
How severe is CVE-2026-80844?
Severity scoring for CVE-2026-80844 is pending analysis.
How do I fix CVE-2026-80844?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST