CVE-2023-53590

sctp: add a refcnt in sctp_stream_priorities to avoid a nested loop

State: Published
Severity: Not scored
Published: Oct 4, 2025
Updated: May 23, 2026
Reserved: Oct 4, 2025

Description

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

sctp: add a refcnt in sctp_stream_priorities to avoid a nested loop

With this refcnt added in sctp_stream_priorities, we don't need to traverse all streams to check if the prio is used by other streams when freeing one stream's prio in sctp_sched_prio_free_sid(). This can avoid a nested loop (up to 65535 * 65535), which may cause a stuck as Ying reported:

watchdog: BUG: soft lockup - CPU#23 stuck for 26s! [ksoftirqd/23:136] Call Trace: <TASK> sctp_sched_prio_free_sid+0xab/0x100 [sctp] sctp_stream_free_ext+0x64/0xa0 [sctp] sctp_stream_free+0x31/0x50 [sctp] sctp_association_free+0xa5/0x200 [sctp]

Note that it doesn't need to use refcount_t type for this counter, as its accessing is always protected under the sock lock.

v1->v2: - add a check in sctp_sched_prio_set to avoid the possible prio_head refcnt overflow.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	a7555681e50bdebed2c40ff7404ee73c2e932993 to before cec326443f01283ef68ea00c06ea073b1835a562Affected 176ee6c673ccd118e9392fd2dbb165423bdb99ca to before 8ee401f89cdb10f39098c0656d695b2bc4052100Affected 0dfb9a566327182387c90100ea54d8426cee8c67 to before bf5540cbd20e2dae2c81ab9b31deef41ef147d0aAffected 9ed7bfc79542119ac0a9e1ce8a2a5285e43433e9 to before 03c3a5584a0a29821e59b7834635ce823050caaaAffected 9ed7bfc79542119ac0a9e1ce8a2a5285e43433e9 to before 6d529928ea212127851a2df8c40d822237ca946bAffected 9ed7bfc79542119ac0a9e1ce8a2a5285e43433e9 to before 68ba44639537de6f91fe32783766322d41848127Affected fa20f88271259d42ebe66f0a8c4c20199e888c99Affected 5.4.226 to before 5.4.235Affected 5.10.158 to before 5.10.173Affected 5.15.82 to before 5.15.100Affected 6.0.12 to before 6.1Affected
LinuxLinux	6.1Affected before 6.1Not affected 5.4.235 through 5.4.Not affected 5.10.173 through 5.10.Not affected 5.15.100 through 5.15.Not affected 6.1.18 through 6.1.Not affected 6.2.5 through 6.2.*Not affected 6.3 and laterNot affected

Product

Versions

LinuxLinux

a7555681e50bdebed2c40ff7404ee73c2e932993 to before cec326443f01283ef68ea00c06ea073b1835a562Affected
176ee6c673ccd118e9392fd2dbb165423bdb99ca to before 8ee401f89cdb10f39098c0656d695b2bc4052100Affected
0dfb9a566327182387c90100ea54d8426cee8c67 to before bf5540cbd20e2dae2c81ab9b31deef41ef147d0aAffected
9ed7bfc79542119ac0a9e1ce8a2a5285e43433e9 to before 03c3a5584a0a29821e59b7834635ce823050caaaAffected
9ed7bfc79542119ac0a9e1ce8a2a5285e43433e9 to before 6d529928ea212127851a2df8c40d822237ca946bAffected
9ed7bfc79542119ac0a9e1ce8a2a5285e43433e9 to before 68ba44639537de6f91fe32783766322d41848127Affected
fa20f88271259d42ebe66f0a8c4c20199e888c99Affected
5.4.226 to before 5.4.235Affected
5.10.158 to before 5.10.173Affected
5.15.82 to before 5.15.100Affected
6.0.12 to before 6.1Affected

LinuxLinux

6.1Affected
before 6.1Not affected
5.4.235 through 5.4.*Not affected
5.10.173 through 5.10.*Not affected
5.15.100 through 5.15.*Not affected
6.1.18 through 6.1.*Not affected
6.2.5 through 6.2.*Not affected
6.3 and laterNot affected

References

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