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Linux Kernel CVE-2026-53006

| EUVDEUVD-2026-38874 CRITICAL
Expired Pointer Dereference (CWE-825)
2026-06-24 Linux GHSA-f2fg-xhhc-4m4w
Information Disclosure Linux
Critical
Disputed · 9.8 Vendor: Linux
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Severity by source

Sources disagree (Medium–Critical)
Vendor (Linux) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
4.8 MEDIUM

Remotely reachable via ICMPv6 (AV:N, PR:N) but needs a reallocation race plus enabled debug logging (AC:H); impact is limited to a memory-disclosure log leak or crash, so C:L/A:L and I:N.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Red Hat
7.0 HIGH
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: Linux

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jun 28, 2026 - 08:48 vuln.today
CVSS changed
Jun 28, 2026 - 08:22 NVD
9.8 (CRITICAL)
Patch available
Jun 24, 2026 - 18:02 EUVD
CVE Published
Jun 24, 2026 - 16:29 cve.org
CRITICAL 9.8
CVE Published
Jun 24, 2026 - 16:29 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

ipv6: fix possible UAF in icmpv6_rcv()

Caching saddr and daddr before pskb_pull() is problematic since skb->head can change.

Remove these temporary variables:

  • We only access &ipv6_hdr(skb)->saddr and &ipv6_hdr(skb)->daddr

when net_dbg_ratelimited() is called in the slow path.

  • Avoid potential future misuse after pskb_pull() call.

AnalysisAI

Use-after-free in the Linux kernel's IPv6 ICMPv6 receive path (icmpv6_rcv()) allows stale pointers to freed socket buffer memory to be dereferenced after a pskb_pull() call relocates skb->head. The affected code cached the source and destination addresses (saddr/daddr) before the pull, and these stale references were only consumed by net_dbg_ratelimited() in the slow path, limiting practical impact. The flaw is fixed upstream across all maintained stable trees; there is no public exploit identified at time of analysis and EPSS exploitation probability is low (0.18%, 8th percentile).

Technical ContextAI

The vulnerability lives in the IPv6 ICMP input handler (net/ipv6/icmp.c, icmpv6_rcv()) of the Linux networking stack. A socket buffer (skb) holds packet data in a buffer referenced by skb->head; calling pskb_pull() can linearize/reallocate that buffer, invalidating any previously taken pointers into it. The buggy code stored &ipv6_hdr(skb)->saddr and &ipv6_hdr(skb)->daddr in temporary variables before the pull, creating dangling pointers - a classic CWE-416 use-after-free (the input lists CWE as N/A, but the root cause is unambiguously a temporal memory-safety error). These dangling references were only read inside net_dbg_ratelimited() on an error/slow path, so the defect surfaces only when kernel network debug logging is active. CPE data identifies the affected component generically as cpe:2.3:a:linux:linux, i.e. the upstream kernel itself.

RemediationAI

Vendor-released patch: update to a fixed stable kernel for your branch - 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10, or mainline 7.1 (or your distribution's backported equivalent). Apply the corresponding stable commit referenced on git.kernel.org (e.g. https://git.kernel.org/stable/c/7bff2c8fe5c35ae58bf73104f53db3676e6e5d94) if you maintain your own kernel build. As an interim compensating control, ensure verbose network-stack debug logging is not enabled in production (the vulnerable path is only reached via net_dbg_ratelimited()), since disabling kernel network debug output prevents the dangling pointers from ever being dereferenced - the trade-off is reduced packet-level diagnostics during troubleshooting. There is no need to disable IPv6 itself, which would be disruptive and is not warranted given the low real-world risk.

Same weakness CWE-825 – Expired Pointer Dereference

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

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CVE-2026-53006 vulnerability details – vuln.today
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