CVE-2026-46331
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.58%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.58% probability · 46th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-190, CWE-787
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- 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
- https://access.redhat.com/errata/RHSA-2026:27288Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27353Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27354Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27355Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27704Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27705Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27706Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27707Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27708Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27709Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27713Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27731Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:27789Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:28887Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:28962Issue Tracking
- https://access.redhat.com/errata/RHSA-2026:29080Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:29794Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:29799Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:29833Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:29856Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:29863Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:33219Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.