CVE-2026-98559: Linux kernel · net/smc: fix UAF on lgr list traversal in smcr_port_err()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in a9b968e42690d784c241a0761c10253271f7df5d : patch Linux kernel soon.
Data as of 26 Oct 2026, 17:16 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in a9b968e42690d784c241a0761c10253271f7df5d, 61cb282fe97b3b0ba32ca09417a693162bf4ae3f, 34bcf11cd2528ae00bb6d764d808083c66824277 +4
Exploitation evidence
Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available and has been applied in the Linux kernel commits identified by the fixedVersions hashes. Users and administrators should update to a Linux kernel version that includes these fixes to remediate the vulnerability.
Description
A use-after-free (UAF) vulnerability was identified and fixed in the Linux kernel's net/smc component. The function smcr_port_err() traversed the smc_lgr_list.list without holding the necessary lock, allowing concurrent termination of list entries that could lead to dereferencing freed memory. The fix involves holding the smc_lgr_list.lock during traversal and adjusting smc_ib_gid_check() to call smcr_port_err() after releasing the lock.
References
- git.kernel.org/stable/c/34bcf11cd2528ae00bb6d764d808083c66824277 (opens in a new tab)
- git.kernel.org/stable/c/0edcc4284392b28826b5d37532b366b291e6e0fa (opens in a new tab)
- git.kernel.org/stable/c/00a59600ae72d24859d0ad1783a78bc921bc2599 (opens in a new tab)
- git.kernel.org/stable/c/3d35f069e1c119992000d51236dbe54da2d4e61e (opens in a new tab)
- git.kernel.org/stable/c/3d65a2eb4449fc9658fb860dea893025d028d90e (opens in a new tab)
- git.kernel.org/stable/c/a9b968e42690d784c241a0761c10253271f7df5d (opens in a new tab)
- git.kernel.org/stable/c/61cb282fe97b3b0ba32ca09417a693162bf4ae3f (opens in a new tab)