CVE-2026-53006

Analyzed Analyzed - Analysis Complete

Use-After-Free in Linux Kernel IPv6 ICMPv6 Handler

Publication date: 2026-06-24

Last updated on: 2026-07-14

Assigner: kernel.org

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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-06-24

Last Modified

2026-07-14

Generated

2026-07-15

AI Q&A

2026-06-24

EPSS Evaluated

2026-07-13

NVD

CVE-2026-53006

EUVD

EUVD-2026-38874

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 6.2 (inc) to 6.6.141 (exc)
linux	linux_kernel	From 6.7 (inc) to 6.12.91 (exc)
linux	linux_kernel	From 6.13 (inc) to 6.18.33 (exc)
linux	linux_kernel	From 6.19 (inc) to 7.0.10 (exc)
linux	linux_kernel	From 5.16 (inc) to 6.1.175 (exc)
linux	linux_kernel	From 5.11 (inc) to 5.15.209 (exc)
linux	linux_kernel	From 4.4 (inc) to 5.10.258 (exc)
redhat	enterprise_linux	8.0
redhat	enterprise_linux	9.0
redhat	enterprise_linux	10.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
CWE-825	The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.

Attack-Flow Graph

Executive Summary

This vulnerability is a use-after-free (UAF) issue in the Linux kernel's IPv6 implementation, specifically in the icmpv6_rcv() function. The problem arises because the source and destination addresses (saddr and daddr) are cached before a call to pskb_pull(), which can change the skb->head pointer. This caching can lead to accessing invalid memory, causing a potential use-after-free condition.

The fix involves removing these temporary cached variables and only accessing the IPv6 header addresses when net_dbg_ratelimited() is called in the slow path, thereby avoiding misuse after pskb_pull() is called.

Impact Analysis

A use-after-free vulnerability in the kernel can lead to system instability, crashes, or potentially allow an attacker to execute arbitrary code with kernel privileges. This can compromise the security and reliability of the affected system.

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