CVE-2026-63971

Summary

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

sctp: fix race between sctp_wait_for_connect and peeloff

sctp_wait_for_connect() drops and re-acquires the socket lock while waiting for the association to reach ESTABLISHED state. During this window, another thread can peeloff the association to a new socket via getsockopt(SCTP_SOCKOPT_PEELOFF), changing asoc->base.sk. After re-acquiring the old socket lock, sctp_wait_for_connect() returns success without noticing the migration — the caller then accesses the association under the wrong lock in sctp_datamsg_from_user().

Add the same sk != asoc->base.sk check that sctp_wait_for_sndbuf() already has, returning an error if the association was migrated while we slept.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux668c9beb9020d5834ee9e43c208190a07d2b1928 < 0e0d5bc76fd4267a71334fcc8f1a5fbcf997845daffected
LinuxLinux668c9beb9020d5834ee9e43c208190a07d2b1928 < bcfeac79af740735ace44008b4a11b8e5add20f5affected
LinuxLinux668c9beb9020d5834ee9e43c208190a07d2b1928 < 8e9b56051d24540cfbf39194618708c4a7633549affected
LinuxLinux668c9beb9020d5834ee9e43c208190a07d2b1928 < 634a9af8a26a84d8b0d7b3b643204b344b42d9fbaffected
LinuxLinux668c9beb9020d5834ee9e43c208190a07d2b1928 < 7d2038d4b80166f7bead8d07eba3b97405816c21affected
LinuxLinux668c9beb9020d5834ee9e43c208190a07d2b1928 < 68667ee4c7dadf7f63167234e2a1af09b3f7874eaffected
LinuxLinux668c9beb9020d5834ee9e43c208190a07d2b1928 < 6140cfa721451fa6e18e134e709703c2bf34d0fbaffected
LinuxLinux668c9beb9020d5834ee9e43c208190a07d2b1928 < f14fe6395a8b3d961a61e138ad7b36ba3626dd4eaffected
LinuxLinux4.16affected
LinuxLinux0 < 4.16unaffected
LinuxLinux5.10.259 <= 5.10.*unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.93 <= 6.12.*unaffected
LinuxLinux6.18.35 <= 6.18.*unaffected
LinuxLinux7.0.12 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References