CVE-2026-46331 - net/sched: fix pedit partial COW leading to page cache corruption

CVE-2026-46331 - net/sched: fix pedit partial COW leading to page cache corruption

https://cvefeed.io/rssfeed/latest.atom / Tue, 06/16/2026 - 11:44
CVE ID :CVE-2026-46331
Published : June 16, 2026, 8:16 a.m. | 1 hour, 22 minutes ago
Description :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.
Severity: 0.0 | NA
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