CVE-2026-74493Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: net/smc: fix socket use-after-free during link group termination __smc_lgr_terminate() drops conns_lock after finding a connection in lgr->conns_all, but before taking…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.5%
In the Linux kernel, the following vulnerability has been resolved:
net/smc: fix socket use-after-free during link group termination
__smc_lgr_terminate() drops conns_lock after finding a connection in lgr->conns_all, but before taking a reference on its socket. The connection is embedded in the socket, and its registration reference protects it only while the connection remains in the tree.
A concurrent close can unregister the connection and drop that reference, freeing the socket before the termination worker reaches sock_hold().
The race is reachable when close overlaps link group termination. Local stress testing reproduced the use-after-free and KASAN reported:
BUG: KASAN: slab-use-after-free in __smc_lgr_terminate.part.0 [smc] Write of size 4 by task kworker/3:3 Workqueue: events smc_lgr_terminate_work [smc] __smc_lgr_terminate.part.0 [smc]
The socket was allocated by smc_create(), freed through slab_free_after_rcu_debug(), and was followed by:
refcount_t: addition on 0; use-after-free. __smc_lgr_terminate.part.0 [smc]
Take the socket reference while conns_lock still protects the tree entry. The unregister path then cannot drop the last reference until termination has finished using the socket.
Linux >= 69318b5215f2dc32c345a3d65b98b4b1bf29c007 < ff44f2df57fb5560bdc75eb977867643e764a262Linux >= 69318b5215f2dc32c345a3d65b98b4b1bf29c007 < 9fb17c95b8f0683570fca1fb2792264147af937aLinux >= 69318b5215f2dc32c345a3d65b98b4b1bf29c007 < bea8dc14de2d56aca749d368563e6888217710a5Linux >= 69318b5215f2dc32c345a3d65b98b4b1bf29c007 < 5a42f162b857019a4c10ff687dc3bcdf51831865Linux >= 69318b5215f2dc32c345a3d65b98b4b1bf29c007 < 281c103a8eaed59001ce952f231df1b07674215aLinux >= 69318b5215f2dc32c345a3d65b98b4b1bf29c007 < f807a63d0d95680c34f677700da9148a07d7c78fLinux >= 69318b5215f2dc32c345a3d65b98b4b1bf29c007 < f0541a775d04c88e90ba448e35ce0d743512822aLinux >= 69318b5215f2dc32c345a3d65b98b4b1bf29c007 < f621d6ebeebb6374342571e4ddf45fdbc420f6cdLinux 5.5Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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