CVE-2023-53590

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxa7555681e50bdebed2c40ff7404ee73c2e932993 < cec326443f01283ef68ea00c06ea073b1835a562affected
LinuxLinux176ee6c673ccd118e9392fd2dbb165423bdb99ca < 8ee401f89cdb10f39098c0656d695b2bc4052100affected
LinuxLinux0dfb9a566327182387c90100ea54d8426cee8c67 < bf5540cbd20e2dae2c81ab9b31deef41ef147d0aaffected
LinuxLinux9ed7bfc79542119ac0a9e1ce8a2a5285e43433e9 < 03c3a5584a0a29821e59b7834635ce823050caaaaffected
LinuxLinux9ed7bfc79542119ac0a9e1ce8a2a5285e43433e9 < 6d529928ea212127851a2df8c40d822237ca946baffected
LinuxLinux9ed7bfc79542119ac0a9e1ce8a2a5285e43433e9 < 68ba44639537de6f91fe32783766322d41848127affected
LinuxLinuxfa20f88271259d42ebe66f0a8c4c20199e888c99affected
LinuxLinux5.4.226 < 5.4.235affected
LinuxLinux5.10.158 < 5.10.173affected
LinuxLinux5.15.82 < 5.15.100affected
LinuxLinux6.0.12 < 6.1affected
LinuxLinux6.1affected
LinuxLinux0 < 6.1unaffected
LinuxLinux5.4.235 <= 5.4.*unaffected
LinuxLinux5.10.173 <= 5.10.*unaffected
LinuxLinux5.15.100 <= 5.15.*unaffected
LinuxLinux6.1.18 <= 6.1.*unaffected
LinuxLinux6.2.5 <= 6.2.*unaffected
LinuxLinux6.3 <= *unaffected

Weaknesses

References