CVE-2026-98559 PUBLISHED

net/smc: fix UAF on lgr list traversal in smcr_port_err()

Assigner: Linux
Reserved: 25.09.2026 Published: 18.10.2026 Updated: 18.10.2026

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

net/smc: fix UAF on lgr list traversal in smcr_port_err()

smcr_port_err() traverses smc_lgr_list.list without holding smc_lgr_list.lock, allowing a concurrent smc_lgr_terminate_sched() to free an lgr while it is still being dereferenced.

Hold smc_lgr_list.lock across the traversal. Update smc_ib_gid_check() to call smcr_port_err() after releasing the lock.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 541afa10c126b6c22c2a805a559c70cc41fd156e to 34bcf11cd2528ae00bb6d764d808083c66824277 (excl.)
  • affected from 541afa10c126b6c22c2a805a559c70cc41fd156e to 0edcc4284392b28826b5d37532b366b291e6e0fa (excl.)
  • affected from 541afa10c126b6c22c2a805a559c70cc41fd156e to 00a59600ae72d24859d0ad1783a78bc921bc2599 (excl.)
  • affected from 541afa10c126b6c22c2a805a559c70cc41fd156e to 3d35f069e1c119992000d51236dbe54da2d4e61e (excl.)
  • affected from 541afa10c126b6c22c2a805a559c70cc41fd156e to 3d65a2eb4449fc9658fb860dea893025d028d90e (excl.)
  • affected from 541afa10c126b6c22c2a805a559c70cc41fd156e to a9b968e42690d784c241a0761c10253271f7df5d (excl.)
  • affected from 541afa10c126b6c22c2a805a559c70cc41fd156e to 61cb282fe97b3b0ba32ca09417a693162bf4ae3f (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 5.8 is affected
  • unaffected from 0 to 5.8 (excl.)
  • unaffected from 5.15.222 to 5.15.* (incl.)
  • unaffected from 6.1.189 to 6.1.* (incl.)
  • unaffected from 6.6.158 to 6.6.* (incl.)
  • unaffected from 6.12.112 to 6.12.* (incl.)
  • unaffected from 6.18.55 to 6.18.* (incl.)
  • unaffected from 7.2.9 to 7.2.* (incl.)
  • unaffected from 7.3-rc5 to * (incl.)

References