CVE-2026-52917

sctp: diag: reject stale associations in dump_one path

State: Published
Severity: 7.1 High
Published: Jun 24, 2026
Updated: Oct 19, 2026
Reserved: Jun 9, 2026

Description

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

sctp: diag: reject stale associations in dump_one path

The SCTP exact sock_diag lookup can hold a transport reference, block on lock_sock(sk), and then resume after sctp_association_free() has marked the association dead and freed its bind address list.

When that happens, inet_assoc_attr_size() and inet_diag_msg_sctpasoc_fill() can still dereference association state that is no longer valid for reporting. In particular, inet_diag_msg_sctpasoc_fill() may read an empty bind-address list as a real sctp_sockaddr_entry and trigger an out-of-bounds read from unrelated association memory.

Reject the association after taking the socket lock if it has been reaped or detached from the endpoint, and report the lookup as stale. This keeps the exact dump-one path from formatting torn association state.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H	Linux

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	8f840e47f190cbe61a96945c13e9551048d42cef to before 6657af827e21883ae90693e42e7f59a6aab690b5Affected 8f840e47f190cbe61a96945c13e9551048d42cef to before b2be72d401833194917e44fbd8d8144bb4f2db16Affected 8f840e47f190cbe61a96945c13e9551048d42cef to before 5425de8bd6e9fe5bd67d158e3348171ae7510117Affected 8f840e47f190cbe61a96945c13e9551048d42cef to before e97c2a535e23ed0fdd2660993fb3f10d9535c9bcAffected 8f840e47f190cbe61a96945c13e9551048d42cef to before 480f754580b5686b928977d16a59f20cef83ff01Affected 8f840e47f190cbe61a96945c13e9551048d42cef to before 78c4f964b2f94e405721c093773f6250e1e676b2Affected 8f840e47f190cbe61a96945c13e9551048d42cef to before f5af203dec6e0e7a6090fcc2130e9f3901bfc84dAffected 8f840e47f190cbe61a96945c13e9551048d42cef to before 5eba3e48d78edd7551b992cb7ba687019b3a78daAffected
LinuxLinux	4.7Affected before 4.7Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

8f840e47f190cbe61a96945c13e9551048d42cef to before 6657af827e21883ae90693e42e7f59a6aab690b5Affected
8f840e47f190cbe61a96945c13e9551048d42cef to before b2be72d401833194917e44fbd8d8144bb4f2db16Affected
8f840e47f190cbe61a96945c13e9551048d42cef to before 5425de8bd6e9fe5bd67d158e3348171ae7510117Affected
8f840e47f190cbe61a96945c13e9551048d42cef to before e97c2a535e23ed0fdd2660993fb3f10d9535c9bcAffected
8f840e47f190cbe61a96945c13e9551048d42cef to before 480f754580b5686b928977d16a59f20cef83ff01Affected
8f840e47f190cbe61a96945c13e9551048d42cef to before 78c4f964b2f94e405721c093773f6250e1e676b2Affected
8f840e47f190cbe61a96945c13e9551048d42cef to before f5af203dec6e0e7a6090fcc2130e9f3901bfc84dAffected
8f840e47f190cbe61a96945c13e9551048d42cef to before 5eba3e48d78edd7551b992cb7ba687019b3a78daAffected

LinuxLinux

4.7Affected
before 4.7Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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