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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-72502 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: tcp: ipv6: clamp default adverting MSS to avoid GSO_BY_FRAGS (0xFFFF) When MTU is large, ip6_default_advmss() can return IPV6_MAXPLEN (65535). This is interpreted by TCP as mss_clamp, allowing the MSS to reach 65535. However, 0xFFFF is also used as a magic value GSO_BY_FRAGS in the kernel. If a TCP packet with gso_size=0xFFFF is passed to skb_segment(), it will be mistakenly treated as GSO_BY_FRAGS, leading to a NULL pointer dereference because local TCP packets do not use frag_list. Fix this by returning min(IPV6_MAXPLEN, GSO_BY_FRAGS - 1) (65534) from ip6_default_advmss() when MTU is large. Also update the stale comment in ip6_default_advmss() which suggested that IPV6_MAXPLEN is returned to mean "any MSS".


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/21f69ac1879bb970588d5e7c12a96e6542f7c1a7 kernel.org
https://git.kernel.org/stable/c/2bf43d0e2e6a27d52a7d624e2d6b9116972e8a22 kernel.org
https://git.kernel.org/stable/c/560b33b434e922ef97f9ff23aa2e909ef7aacd5c kernel.org
https://git.kernel.org/stable/c/572fff10819dfc359298d1f774839e76a4d96f93 kernel.org
https://git.kernel.org/stable/c/8e6214a530c03e341dc1b0a846c8f2b716b3551a kernel.org
https://git.kernel.org/stable/c/a210791f33345aa87187f7d7a9f3b9b7f4a28e6d kernel.org
https://git.kernel.org/stable/c/c0db3dc2ac323b6c4b76adede3b355a9daa6dea8 kernel.org
https://git.kernel.org/stable/c/d774cdbda6634a78d0f2baf201ee5a8c57f3bc0e kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-72502
NVD Published Date:
08/15/2026
NVD Last Modified:
08/15/2026
Source:
kernel.org