# 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 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. - Page: https://www.vulneraibility.com/cve/CVE-2026-46331 - CVSS: 7.8 - Known exploited: not in CISA KEV as of our last sync - EPSS: 0.64% (percentile 51.1) - Unvetted proof-of-concept code on GitHub: 14 GitHub proofs of concept (first 2026-06-17) - CISA SSVC: exploitation poc, automatable no, technical impact total (assessed 2026-06-29) - Weakness: CWE-787, CWE-190 - Published: 2026-06-16 ## Affected versions - Linux: affected >= abe35bf3be51482593076d516a680d79e5fbc8e1 and < 544d857b42a1734b923040e13aa61a6fd4746cf2; >= b773640d5bb9e2acfd91e2695717af04d47aa116 and < d5d01d35a5a7d36f7cb679b67d9cbdd5205672dc; >= 8b796475fd7882663a870456466a4fb315cc1bd6 and < a071e057518decc5e3bec89855758f5f8786f2c5; >= 8b796475fd7882663a870456466a4fb315cc1bd6 and < b685d6ef6f07a3b5ce814565a25f39f2157538a5; >= 8b796475fd7882663a870456466a4fb315cc1bd6 and < 2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61b; >= 8b796475fd7882663a870456466a4fb315cc1bd6 and < b198ed4e52580a7238c7c7082f03906f8b310313; >= 8b796475fd7882663a870456466a4fb315cc1bd6 and < 3dee9d0c198faeb95d052c1b94c2958751a28512; >= 8b796475fd7882663a870456466a4fb315cc1bd6 and < 899ee91156e57784090c5565e4f31bd7dbffbc5a; d0c38a914b0c4c21d553da801003d36979016726; 2ec2dd7d51a9320151f275ddbb2b53260fb32ca1; c19cc520b3d69904e9518d401ad0df7f4702aca0; >= 5.10.117 and < 5.10.260; >= 5.15.41 and < 5.15.211; >= 4.19.244 and < 4.20; >= 5.4.195 and < 5.5; >= 5.17.9 and < 5.18; 5.18; fixed in < 5.18, >= 5.10.260 and <= 5.10.*, >= 5.15.211 and <= 5.15.*, >= 6.1.177 and <= 6.1.*, >= 6.6.144 and <= 6.6.*, >= 6.12.94 and <= 6.12.*, >= 6.18.36 and <= 6.18.*, >= 7.0.13 and <= 7.0.*, >= 7.1 and <= * A version outside these ranges is not a statement that it is unaffected. ## References - [other] https://git.kernel.org/stable/c/544d857b42a1734b923040e13aa61a6fd4746cf2 - [other] https://git.kernel.org/stable/c/d5d01d35a5a7d36f7cb679b67d9cbdd5205672dc - [other] https://git.kernel.org/stable/c/a071e057518decc5e3bec89855758f5f8786f2c5 - [other] https://git.kernel.org/stable/c/b685d6ef6f07a3b5ce814565a25f39f2157538a5 - [other] https://git.kernel.org/stable/c/2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61b - [other] https://git.kernel.org/stable/c/b198ed4e52580a7238c7c7082f03906f8b310313 - [other] https://git.kernel.org/stable/c/3dee9d0c198faeb95d052c1b94c2958751a28512 - [other] https://git.kernel.org/stable/c/899ee91156e57784090c5565e4f31bd7dbffbc5a - [exploit] https://github.com/sgkdev/packet_edit_meme/tree/main - [other] https://access.redhat.com/security/cve/CVE-2026-46331 - [other] https://bugzilla.redhat.com/show_bug.cgi?id=2479492 - [other] https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46331.json - [advisory] https://access.redhat.com/errata/RHSA-2026:27709 - [advisory] https://access.redhat.com/errata/RHSA-2026:33666 - [advisory] https://access.redhat.com/errata/RHSA-2026:34048 - [advisory] https://access.redhat.com/errata/RHSA-2026:40021 - [advisory] https://access.redhat.com/errata/RHSA-2026:28887 - [advisory] https://access.redhat.com/errata/RHSA-2026:28962 - [advisory] https://access.redhat.com/errata/RHSA-2026:29080 - [advisory] https://access.redhat.com/errata/RHSA-2026:34098 - [advisory] https://access.redhat.com/errata/RHSA-2026:29856 - [advisory] https://access.redhat.com/errata/RHSA-2026:29863 - [advisory] https://access.redhat.com/errata/RHSA-2026:29799 - [advisory] https://access.redhat.com/errata/RHSA-2026:29833 - [advisory] https://access.redhat.com/errata/RHSA-2026:29794 - [advisory] https://access.redhat.com/errata/RHSA-2026:27731 - [advisory] https://access.redhat.com/errata/RHSA-2026:27288 - [advisory] https://access.redhat.com/errata/RHSA-2026:27705 - [advisory] https://access.redhat.com/errata/RHSA-2026:27713 - [advisory] https://access.redhat.com/errata/RHSA-2026:27708 - [advisory] https://access.redhat.com/errata/RHSA-2026:27789 - [advisory] https://access.redhat.com/errata/RHSA-2026:33225 - [advisory] https://access.redhat.com/errata/RHSA-2026:27353 - [advisory] https://access.redhat.com/errata/RHSA-2026:33220 - [advisory] https://access.redhat.com/errata/RHSA-2026:27707 - [advisory] https://access.redhat.com/errata/RHSA-2026:27704 - [advisory] https://access.redhat.com/errata/RHSA-2026:27355 - [advisory] https://access.redhat.com/errata/RHSA-2026:33219 - [advisory] https://access.redhat.com/errata/RHSA-2026:33221 - [advisory] https://access.redhat.com/errata/RHSA-2026:33222 - [advisory] https://access.redhat.com/errata/RHSA-2026:33223 - [advisory] https://access.redhat.com/errata/RHSA-2026:33224 - [advisory] https://access.redhat.com/errata/RHSA-2026:27354 - [advisory] https://access.redhat.com/errata/RHSA-2026:27706 - [other] https://cert-portal.siemens.com/productcert/html/ssa-784472.html --- Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.