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

mediumCVSS 4.7CVE-2026-74493

CSIRTS triage

vendor: Linux product: Linux kernel Memory corruption

What: The SMC socket implementation does not properly synchronize socket object cleanup during link group termination, causing use-after-free.
Who is affected: Systems running Linux kernel with SMC (Shared Memory Communication) protocol support enabled.
Urgency: Medium priority; CVSS 4.7 with potential denial-of-service or memory corruption risk.
Action: Apply Linux kernel patch addressing CVE-2026-74493 when available.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 4.7
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74493

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-744930.50% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74493	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

criticalCVE-2026-74493: In the Linux kernel, the following vulnerability has been resolved: net/smc: fix socket use-af…nvd

Recent advisories for net/smc

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-74719: In the Linux kernel, the following vulnerability has been resolved: net/smc: fix qentry overwr…nvd · 2026-08-22
highCVE-2026-74692: In the Linux kernel, the following vulnerability has been resolved: net/smc: fix TOCTOU race b…nvd · 2026-08-22
criticalCVE-2026-74493: In the Linux kernel, the following vulnerability has been resolved: net/smc: fix socket use-af…nvd · 2026-08-15
mediumCVE-2026-74692: net/smc: fix TOCTOU race between smc_listen_out() and listener closemsrc · 2026-08-11
lowCVE-2026-74719: net/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()msrc · 2026-08-11
mediumCVE-2024-49568: net/smc: check v2_ext_offset/eid_cnt/ism_gid_cnt when receiving proposal msgmsrc · 2026-08-06