How severe is CVE-2026-53006?

CVE-2026-53006 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2026-53006?

CVE-2026-53006 affects the following packages: Kernel (Linux). Ecosystems affected: Linux.

How do I fix CVE-2026-53006?

Update Kernel to 5.10.258 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-53006 is resolved across your whole dependency graph.

How do I detect CVE-2026-53006 in my Linux dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Kernel, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-53006 if there is no patch (or I can't update yet)?

Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

Is CVE-2026-53006 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-53006 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-53006?

CVE-2026-53006 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 32th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-53006?

CVE-2026-53006 is classified as Use After Free (CWE-416), CWE-825 (CWE-825). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-53006 published, and has it been updated?

CVE-2026-53006 was published on June 24, 2026 and was last updated on September 18, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐧

🐧 Linux

Not in CISA KEV

CRITICAL severity

CVE-2026-53006 — Kernel

CRITICAL

CVE-2026-53006 is a critical-severity (CVSS 9.8) Use After Free vulnerability in Kernel. A fix is available for Kernel — see the affected versions and patch details below.

ipv6: fix possible UAF in icmpv6_rcv()

Published

Jun 24, 2026

Updated

Sep 18, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk-0.00%

Lower risk than most CVEs32th percentile — riskier than 32% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-53006 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

🐧Kernel

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Linux packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐧Linux	`Kernel`	≥ 4.4.0&&< 5.10.258	5.10.258

Affected Products

2 products · 10 configurations

linux kernellinux

≥ 6.19 && < 7.0.10

range

enterprise linuxredhat

3 versions

8.09.010.0

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Kernel, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update Kernel to 5.10.258 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-53006 is resolved across your whole dependency graph.
Workarounds
Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

Product	Fixed in	Advisory
Red Hat Enterprise Linux 10	`kernel-0:6.12.0-211.40.1.el10_2`	RHSA-2026:47017
Red Hat Enterprise Linux 10.0 Extended Update Support	`kernel-0:6.12.0-55.103.1.el10_0`	RHSA-2026:64767
Red Hat Enterprise Linux 8	`kernel-rt-0:4.18.0-553.148.1.rt7.489.el8_10`	RHSA-2026:47010
Red Hat Enterprise Linux 8	`kernel-0:4.18.0-553.148.1.el8_10`	RHSA-2026:47011
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	`kernel-0:4.18.0-305.206.1.el8_4`	RHSA-2026:65710
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	`kernel-0:4.18.0-372.213.1.el8_6`	RHSA-2026:65711
Red Hat Enterprise Linux 8.8 Telecommunications Update Service	`kernel-0:4.18.0-477.163.1.el8_8`	RHSA-2026:61932
Red Hat Enterprise Linux 9	`kernel-0:5.14.0-687.30.1.el9_8`	RHSA-2026:45192

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

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