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Advisory severityHigh7.0Red Hat Linux

High [CVE-2026-63924] refresh nh pointer after ipv6_hop_jumbo

This high-severity Red Hat Linux advisory covers CVE-2026-63924 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-63924 Source published Source updated

VulniPulse record published Record updated

CVE-2026-63924
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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Summary

In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo() ipv6_hop_jumbo() calls pskb_trim_rcsum(), which can change skb pointers. Let's recompute nh pointer to make sure any change won't mess things up.

A flaw was found in the Linux kernel's handling of IPv6 extended headers. Specifically, the `ipv6_hop_jumbo()` function, which processes jumbo payloads, can modify internal packet buffer (skb) pointers.

However, the network header (nh) pointer is not recomputed after these modifications. This oversight could lead to incorrect data processing, potentially causing system instability or a denial of service (DoS) due to malformed packets.

Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-825.

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; and 9 more.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Fixed versions
  • kernel-0:6.12.0-211.63.1.el10_2
  • kernel-0:6.12.0-55.111.1.el10_0
  • kernel-0:2.6.32-754.65.1.el6
  • kernel-0:4.18.0-305.214.1.el8_4
  • kernel-0:4.18.0-372.223.1.el8_6
  • kernel-0:4.18.0-477.175.1.el8_8
  • kernel-0:5.14.0-687.55.1.el9_8
  • kernel-0:5.14.0-427.154.1.el9_4
  • kernel-0:5.14.0-570.147.1.el9_6
  • RHSA-2026:76738
  • RHSA-2026:83707
  • RHSA-2026:83796
  • RHSA-2026:84677
  • RHSA-2026:85000
  • RHSA-2026:84793
  • RHSA-2026:76739
  • RHSA-2026:77218
  • RHSA-2026:77219

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

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