CVE-2025-39964High· 7.8▾ Abyssal⚠ Exploited in the wildPoC availableIn the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable…
▾ Abyssal zone — Critical with a public exploit or in-the-wild use
impact 42.9 · likelihood 0.3 · exploitation 25
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
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.
Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
Federal remediation due Sep 21, 2026
Last analysed / modified upstream
0.3% → 1.6%
2 GitHub repos (last check)
Added to the CISA catalog on Sep 18, 2026. Federal remediation due Sep 21, 2026. View catalog ↗
In the Linux kernel, the following vulnerability has been resolved:
crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg
Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencies in the internal socket state.
Disallow this by adding a new ctx->write field that indiciates exclusive ownership for writing.
linux_kernel >= 2.6.38, < 5.10.245linux_kernel >= 5.11, < 5.15.194linux_kernel >= 5.16, < 6.1.154linux_kernel >= 6.2, < 6.6.108linux_kernel >= 6.7, < 6.12.49linux_kernel >= 6.13, < 6.16.9linux_kernel = 6.17simatic_s7-1500_cpu_1518-4_pn/dp_mfp_firmware >= 3.1.6simatic_s7-1500_cpu_1518f-4_pn/dp_mfp_firmware >= 3.1.6Upgrade past the affected range:
linux_kernel 6.16.9Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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