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

> A flaw in the Linux kernel's packet scheduler allows memory corruption via improper copy-on-write handling, potentially enabling code execution or privilege escalation.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Jun 2026
- **Updated:** 15 Oct 2026
- **Also known as:** AZL-90107, BELL-CVE-2026-46331, DEBIAN-CVE-2026-46331, GHSA-cr2w-747q-47qc, OESA-2026-2870, RHSA-2026:27355, RHSA-2026:27704, RHSA-2026:27705, RHSA-2026:27706, RHSA-2026:27707, RHSA-2026:27709, RHSA-2026:33666, ROOT-OS-DEBIAN-11-CVE-2026-46331, ROOT-OS-DEBIAN-12-CVE-2026-46331, ROOT-OS-DEBIAN-13-CVE-2026-46331, ROOT-OS-UBUNTU-2204-CVE-2026-46331, ROOT-OS-UBUNTU-2404-CVE-2026-46331, UBUNTU-CVE-2026-46331

## What is CVE-2026-46331?

CVE-2026-46331 is a high-severity memory corruption vulnerability in Linux kernel, published on 16 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

Weakness: CWE-787 (Out-of-bounds Write), CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2026-46331?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `kernel` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-64k` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-64k` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-64k-core` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-64k-core` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-64k-debug` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-64k-debug` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-64k-debug-core` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-64k-debug-core` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-64k-debug-debuginfo` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-64k-debug-debuginfo` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-64k-debug-modules` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-64k-debug-modules` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-64k-debug-modules-core` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-64k-debug-modules-core` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-64k-debug-modules-extra` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-64k-debug-modules-extra` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-64k-debuginfo` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-64k-debuginfo` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-64k-modules` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-64k-modules` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-64k-modules-core` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-64k-modules-core` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-64k-modules-extra` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-64k-modules-extra` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-abi-stablelists` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-abi-stablelists` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-core` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-core` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-debug` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-debug` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-debug-core` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-debug-core` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-debug-debuginfo` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-debug-debuginfo` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-debug-devel` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-debug-devel` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |
| `kernel-debug-devel-matched` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-212.11.el10nv |
| `kernel-debug-devel-matched` | Red Hat:enterprise_linux_nvidia:10::el10 | All versions | 0:6.12.0-231.13.el10nv |

Products: Linux kernel.

## How do I fix CVE-2026-46331?

Apply the vendor's patch.

## Is CVE-2026-46331 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46331 exists.

Public exploit code:

- PACKET_EDIT_MEME.c (aka CVE-2026-46331): yet another page cache poisoning nightmare (github_poc): https://github.com/sgkdev/packet_edit_meme
- CVE-2026-46331 (github_poc): https://github.com/0xredash/CVE-2026-46331
- CVE-2026-46331 and CVE-2026-43503 (github_poc): https://github.com/rjt-gupta/page-cache-corruption-lpes
- CVE-2026-46331 — Linux Kernel Local Privilege Escalation TC pedit + IPsec TEE Page Cache Corruption · Affected kernels: ≤ 6.12.9 (github_poc): https://github.com/vulnquest58/dirtyclone-exploit
- CVE-2026-46331 act_pedit page-cache corruption exploit, with Alpine PIE fix (github_poc): https://github.com/yanxinwu946/CVE-2026-46331
- pedit COW (github_poc): https://github.com/V0IDNETWORK/CVE-2026-46331

## Other vulnerabilities in Linux kernel

- [CVE-2026-53266](https://insights.sbomify.com/CVE-2026-53266/): Linux Kernel Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2013-6282](https://insights.sbomify.com/CVE-2013-6282/): Linux Kernel Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2022-0185](https://insights.sbomify.com/CVE-2022-0185/): Linux Kernel Heap-Based Buffer Overflow (high 8.4, exploited in the wild)
- [CVE-2013-2094](https://insights.sbomify.com/CVE-2013-2094/): Linux Kernel Privilege Escalation (high 8.4, exploited in the wild)
- [CVE-2026-53362](https://insights.sbomify.com/CVE-2026-53362/): Linux Kernel Unspecified (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-46331 and fix it if it is affected.

What it is: CVE-2026-46331 is a high-severity memory corruption vulnerability in Linux kernel, published on 16 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46331 exists.

Affected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-46331/ (Markdown: https://insights.sbomify.com/CVE-2026-46331/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-46331
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-46331
- OSV: https://osv.dev/vulnerability/CVE-2026-46331

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-46331/
Summaries are generated and may contain mistakes; the official description above is the record.