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Back to active CVEs
Critical ยท CVSS 10.0CVE-2026-74705

udp: fix potential use-after-free in tunnel segmentationCVE-2026-74705

Answer in brief

CVE-2026-74705 records a Critical severity (CVSS 10.0) vulnerability in udp: fix potential use-after-free in tunnel segmentation. 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 Aug 22, 2026Updated Aug 25, 2026Source checked Oct 7, 2026First seen by HOL Aug 22, 2026Material review Aug 25, 2026
Upstream Advisory

Key facts

Risk
Critical ยท CVSS 10.0
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 10.0. 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>=dbef491ebe7f3a4fb1b9111878b86a426fd540b7 <6a733a38b983d8c2e222f13968209010cf44de87 || >=dbef491ebe7f3a4fb1b9111878b86a426fd540b7 <19d89b13a43640b2da2f277ee462d919d988cb6f || >=dbef491ebe7f3a4fb1b9111878b86a426fd540b7 <b3df61bb745eb5201eac22679a2839d4ccbf3442 || >=dbef491ebe7f3a4fb1b9111878b86a426fd540b7 <1ae134c012e10384cdac420b5cc6e0615cde0b55 || >=dbef491ebe7f3a4fb1b9111878b86a426fd540b7 <5161e67c561c4f28a5d9335a6e859b02511de92b || >=dbef491ebe7f3a4fb1b9111878b86a426fd540b7 <64d322c288577793eedd352b96ef75234ed380fe || >=dbef491ebe7f3a4fb1b9111878b86a426fd540b7 <588d4a6795d99d080f74ef0b5f391ea8c453ae5d || >=dbef491ebe7f3a4fb1b9111878b86a426fd540b7 <d0f86fb36eb260abd10007b62c9dcc1028e03e616a733a38b983d8c2e222f13968209010cf44de87, 19d89b13a43640b2da2f277ee462d919d988cb6f, b3df61bb745eb5201eac22679a2839d4ccbf3442, 1ae134c012e10384cdac420b5cc6e0615cde0b55, 5161e67c561c4f28a5d9335a6e859b02511de92b, 64d322c288577793eedd352b96ef75234ed380fe, 588d4a6795d99d080f74ef0b5f391ea8c453ae5d, d0f86fb36eb260abd10007b62c9dcc1028e03e61
Linux/Linuxgeneric4.6Not 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 6a733a38b983d8c2e222f13968209010cf44de87 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 22, 2026

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

  2. Source modified

    Aug 25, 2026

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

  3. First seen by HOL

    Aug 22, 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 referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: udp: fix potential use-after-free in tunnel segmentation __skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer is no longer valid. Get the UDP header after the pull to avoid a potential use-after-free.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

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  • Langflow OSS is affected by multiple vulnerabilitiesSame generic ecosystem
  • Langflow OSS is affected by multiple vulnerabilitiesSame generic ecosystem

Record context

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