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Back to active CVEs
Critical · CVSS 9.1CVE-2024-26665

tunnels: fix out of bounds access when building IPv6 PMTU errorCVE-2024-26665

Answer in brief

CVE-2024-26665 records a Critical severity (CVSS 9.1) vulnerability in tunnels: fix out of bounds access when building IPv6 PMTU error. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 2, 2024Updated Aug 5, 2026Source checked Nov 4, 2026First seen by HOL Aug 5, 2026Material review Aug 5, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 4, 2026
References
7 linked sources
Open source record

Key facts

Risk
Critical · CVSS 9.1
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d || >=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <d964dd1bc1452594b4207d9229c157d9386e5d8a || >=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <e37cde7a5716466ff2a76f7f27f0a29b05b9a732 || >=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <510c869ffa4068c5f19ff4df51d1e2f3a30aaac1 || >=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <7dc9feb8b1705cf00de20563b6bc4831f4c99dab || >=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <d75abeec401f8c86b470e7028a13fcdc87e5dd06e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d, d964dd1bc1452594b4207d9229c157d9386e5d8a, e37cde7a5716466ff2a76f7f27f0a29b05b9a732, 510c869ffa4068c5f19ff4df51d1e2f3a30aaac1, 7dc9feb8b1705cf00de20563b6bc4831f4c99dab, d75abeec401f8c86b470e7028a13fcdc87e5dd06
Linux/Linuxgeneric5.9Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Apr 2, 2024

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 5, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencelists.debian.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: tunnels: fix out of bounds access when building IPv6 PMTU error If the ICMPv6 error is built from a non-linear skb we get the following splat, BUG: KASAN: slab-out-of-bounds in do_csum+0x220/0x240 Read of size 4 at addr ffff88811d402c80 by task netperf/820 CPU: 0 PID: 820 Comm: netperf Not tainted 6.8.0-rc1+ #543 ... kasan_report+0xd8/0x110 do_csum+0x220/0x240 csum_partial+0xc/0x20 skb_tunnel_check_pmtu+0xeb9/0x3280 vxlan_xmit_one+0x14c2/0x4080 vxlan_xmit+0xf61/0x5c00 dev_hard_start_xmit+0xfb/0x510 __dev_queue_xmit+0x7cd/0x32a0 br_dev_queue_push_xmit+0x39d/0x6a0 Use skb_checksum instead of csum_partial who cannot deal with non-linear SKBs.

Quoted source text, attributed separately from HOL analysis.