What’s Vulnerable › Vulnerabilities

CVE-2026-98559: net/smc: fix UAF on lgr list traversal in smcr_port_err()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-18 · updated 2026-10-19

Description

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.

Affected products

• Linux kernel: 5.8 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/00a59600ae72d24859d0ad1783a78bc921bc2599
• https://git.kernel.org/stable/c/0edcc4284392b28826b5d37532b366b291e6e0fa
• https://git.kernel.org/stable/c/34bcf11cd2528ae00bb6d764d808083c66824277
• https://git.kernel.org/stable/c/3d35f069e1c119992000d51236dbe54da2d4e61e
• https://git.kernel.org/stable/c/3d65a2eb4449fc9658fb860dea893025d028d90e
• https://git.kernel.org/stable/c/61cb282fe97b3b0ba32ca09417a693162bf4ae3f
• https://git.kernel.org/stable/c/a9b968e42690d784c241a0761c10253271f7df5d

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