Linux Kernel net/sched pedit partial COW causing cache corruption
CVE-2026-46331 Published on June 16, 2026
net/sched: fix pedit partial COW leading to page cache corruption
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.
Products Associated with CVE-2026-46331
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Affected Versions
Linux:- Version 8b796475fd7882663a870456466a4fb315cc1bd6 and below 899ee91156e57784090c5565e4f31bd7dbffbc5a is affected.
- Version d0c38a914b0c4c21d553da801003d36979016726 is affected.
- Version 2ec2dd7d51a9320151f275ddbb2b53260fb32ca1 is affected.
- Version abe35bf3be51482593076d516a680d79e5fbc8e1 is affected.
- Version b773640d5bb9e2acfd91e2695717af04d47aa116 is affected.
- Version c19cc520b3d69904e9518d401ad0df7f4702aca0 is affected.
- Version 4.19.244 and below 4.20 is affected.
- Version 5.4.195 and below 5.5 is affected.
- Version 5.10.117 and below 5.11 is affected.
- Version 5.15.41 and below 5.16 is affected.
- Version 5.17.9 and below 5.18 is affected.
- Version 5.18 is affected.
- Before 5.18 is unaffected.
- Version 7.1, <= * is unaffected.