CVE-2026-46331

Summary

In the Linux kernel, the following vulnerability has been resolved: net/sched: fix pedit partial COW leading to page cache corruption tcf_pedit_act() computes the COW range for skb_ensure_writable() once before the key loop using tcfp_off_max_hint, but the hint does not account for the runtime header offset added by typed keys. This can leave part of the write region un-COW'd. Fix by moving skb_ensure_writable() inside the per-key loop where the actual write offset is known, and add overflow checking on the offset arithmetic. For negative offsets (e.g. Ethernet header edits at ingress), use skb_cow() to COW the headroom instead. Guard offset_valid() against INT_MIN, where negation is undefined.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61b ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61bPatch
• https://git.kernel.org/stable/c/3dee9d0c198faeb95d052c1b94c2958751a28512Patch
• https://git.kernel.org/stable/c/544d857b42a1734b923040e13aa61a6fd4746cf2Patch
• https://git.kernel.org/stable/c/899ee91156e57784090c5565e4f31bd7dbffbc5aPatch
• https://git.kernel.org/stable/c/a071e057518decc5e3bec89855758f5f8786f2c5Patch
• https://git.kernel.org/stable/c/b198ed4e52580a7238c7c7082f03906f8b310313Patch
• https://git.kernel.org/stable/c/b685d6ef6f07a3b5ce814565a25f39f2157538a5Patch
• https://git.kernel.org/stable/c/d5d01d35a5a7d36f7cb679b67d9cbdd5205672dcPatch