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CVE-2026-80844

UnknownEPSS 0.43%

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. EPSS estimates a 0.43% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.43%

36.2th percentile

Probability of exploitation in the next 30 days. Learn more

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. The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.
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