CVE-2026-46331 | 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.

Published: 2026-06-16 Last update: 2026-07-10 Assigner: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-46331 is rated Low Risk (37.3/100): CVSS High severity, with low exploitation likelihood (EPSS 0.26%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-46331

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-30 0.23% 0.26% +0.03%
2 2026-06-28 0.29% 0.23% -0.06%
3 2026-06-23 — 0.29% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-46331

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 416baaa9-dc9f-4396-8d5f-8c081fb06d67
6.7 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.8 5.9 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Weakness enumeration for CVE-2026-46331

GitHub Security Advisory for CVE-2026-46331

GHSA-cr2w-747q-47qc · Severity: high — In the Linux kernel, the following vulnerability has been resolved: net/sched: fix pedit partial...

OS Trackers for CVE-2026-46331

vendor priority summary link
debian not yet assigned CVE-2026-46331 not yet assigned priority: Debian including 2 source packages (linux, linux-6.1), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5, open 1. https://security-tracker.debian.org/tracker/CVE-2026-46331
suse high CVE-2026-46331 severity important: SUSE including 4 source package names (kernel-default, kernel-default-base, kernel-default-devel, kernel-source), 6 product×package rows across 2 product lines (SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE, SUSE Linux Enterprise Server Teradata 12 SP3): Known Not Affected 6. https://www.suse.com/security/cve/CVE-2026-46331/
ubuntu high CVE-2026-46331 high priority: Ubuntu including 162 source packages (linux, linux-allwinner-5.19, …), 1458 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): DNE 1051, ignored 172, needed 140, released 88, not-affected 7. https://ubuntu.com/security/CVE-2026-46331

Affected software / configurations for CVE-2026-46331

Vendor Product Version Raw CPE
linux linux_kernel >= 4.19.244, < 4.20 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.4.195, < 5.5 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.10.117, < 5.11 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.15.41, < 5.16 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.17.9, < 5.18 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.18.1, < 6.12.94 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.13, < 6.18.36 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.19, < 7.0.13 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel 5.18 cpe:2.3:o:linux:linux_kernel:5.18:-:*:*:*:*:*:*
linux linux_kernel 5.18 cpe:2.3:o:linux:linux_kernel:5.18:rc7:*:*:*:*:*:*
linux linux_kernel 7.1 cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
linux linux_kernel 7.1 cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
linux linux_kernel 7.1 cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
linux linux_kernel 7.1 cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*
linux linux_kernel 7.1 cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*
linux linux_kernel 7.1 cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*

References for CVE-2026-46331

URL Tags
https://git.kernel.org/stable/c/2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61b Patch
https://git.kernel.org/stable/c/3dee9d0c198faeb95d052c1b94c2958751a28512 Patch
https://git.kernel.org/stable/c/544d857b42a1734b923040e13aa61a6fd4746cf2 Patch
https://git.kernel.org/stable/c/899ee91156e57784090c5565e4f31bd7dbffbc5a Patch
https://git.kernel.org/stable/c/a071e057518decc5e3bec89855758f5f8786f2c5 Patch
https://git.kernel.org/stable/c/b198ed4e52580a7238c7c7082f03906f8b310313 Patch
https://git.kernel.org/stable/c/b685d6ef6f07a3b5ce814565a25f39f2157538a5 Patch
https://git.kernel.org/stable/c/d5d01d35a5a7d36f7cb679b67d9cbdd5205672dc Patch
https://access.redhat.com/errata/RHSA-2026:27288 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27353 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27354 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27355 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27704 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27705 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27706 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27707 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27708 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27709 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27713 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27731 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27789 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:28887 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:28962 Issue Tracking
https://access.redhat.com/errata/RHSA-2026:29080 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:29794 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:29799 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:29833 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:29856 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:29863 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:33219 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:33220 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:33221 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:33222 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:33223 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:33224 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:33225 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:33666 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:34048
https://access.redhat.com/errata/RHSA-2026:34098
https://access.redhat.com/security/cve/CVE-2026-46331 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2479492 Third Party Advisory
https://github.com/sgkdev/packet_edit_meme/tree/main Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46331.json Third Party Advisory
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