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CVE-2026-74493— net/smc: fix socket use-after-free during link group termination

CVSS 9.8 · Critical EPSS 0.44% · P37

Possible ATT&CK Techniques 1AI

T1211 · Exploitation for Stealth

Affected Version Matrix 12

VendorProductVersion RangeStatus
LinuxLinux69318b5215f2dc32c345a3d65b98b4b1bf29c007< 5a42f162b857019a4c10ff687dc3bcdf51831865affected
69318b5215f2dc32c345a3d65b98b4b1bf29c007< 281c103a8eaed59001ce952f231df1b07674215aaffected
69318b5215f2dc32c345a3d65b98b4b1bf29c007< f807a63d0d95680c34f677700da9148a07d7c78faffected
69318b5215f2dc32c345a3d65b98b4b1bf29c007< f0541a775d04c88e90ba448e35ce0d743512822aaffected
69318b5215f2dc32c345a3d65b98b4b1bf29c007< f621d6ebeebb6374342571e4ddf45fdbc420f6cdaffected
5.5affected
< 5.5unaffected
6.6.151≤ 6.6.*unaffected
… +4 more rows
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I. Basic Information for CVE-2026-74493

Vulnerability Information
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Vulnerability Title
net/smc: fix socket use-after-free during link group termination
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.5版本存在安全漏洞，该漏洞源于net/smc链路组终止过程中套接字释放后重用，可能导致系统崩溃或内存破坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 69318b5215f2dc32c345a3d65b98b4b1bf29c007 ~ 5a42f162b857019a4c10ff687dc3bcdf51831865 -
LinuxLinux 5.5 -

II. Public POCs for CVE-2026-74493

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III. Intelligence Information for CVE-2026-74493

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Patches & Fixes for CVE-2026-74493 (4)

Same Patch Batch · Linux · 2026-08-15 · 846 CVEs total

CVE-2026-7240710.0 CRITICALgeneve: validate inner network offset in geneve_gro_complete()
CVE-2026-7240810.0 CRITICALgeneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-7427910.0 CRITICALcrypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-7242110.0 CRITICALipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-7428010.0 CRITICALcrypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-7430910.0 CRITICALvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-7447510.0 CRITICALvxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-724939.9 CRITICALnet: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-724369.8 CRITICALnetfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types
CVE-2026-743949.8 CRITICALRDMA/srpt: fix integer overflow in immediate data length check
CVE-2026-724179.8 CRITICALnetfilter: flowtable: Validate iph->ihl in nf_flow_ip4_tunnel_proto()
CVE-2026-720699.8 CRITICALlocking/rt: Fix the incorrect RCU protection in rt_spin_unlock()
CVE-2026-724229.8 CRITICALksmbd: fix use-after-free of conn->preauth_info in concurrent SMB2 NEGOTIATE
CVE-2026-720659.8 CRITICALnet: mana: Validate the packet length reported by the NIC
CVE-2026-720649.8 CRITICALnet: mana: Sync page pool RX frags for CPU
CVE-2026-724299.8 CRITICALipv6: ioam: fix type confusion of dst_entry
CVE-2026-722519.8 CRITICALnetfilter: nf_nat_sip: reload possible stale data pointer
CVE-2026-722269.8 CRITICALbatman-adv: tt: prevent TVLV OOB check overflow
CVE-2026-724519.8 CRITICALxfrm: Fix xfrm state cache insertion race
CVE-2026-720419.8 CRITICALespintcp: use sk_msg_free_partial to fix partial send

Showing top 20 of 846 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74493

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