Linux Kernel Race Condition Vulnerability
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…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 2 / 5
- KEV catalog (CISA)18 Sept 2026
- Exploited in EUVD (ENISA)18 Sept 2026
- Used by ransomwareno
- EPSS above 10 %1.6%
- No account, over the networkno
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
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.
Affected products
- patch: 6.6.108
- patch: 6.17
- patch: 0
- 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 <9aee87da5572b3a14075f501752e209801160d3d
- patch: 5.15.194
- 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 <e4c1ec11132ec466f7362a95f36a506ce4dc08c9
- patch: 6.16.9
- patch: 6.1.154
- 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 <7c4491b5644e3a3708f3dbd7591be0a570135b84
- 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 <45bcf60fe49b37daab1acee57b27211ad1574042
- 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 <1b34cbbf4f011a121ef7b2d7d6e6920a036d5285
- patch: 5.10.245
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
References
Other exploited vulnerabilities from the same vendor
- CVE-2026-46300Linux Kernel Missing Initialization of a Variable Vulnerability5.4 · Rising fast
- CVE-2026-53266Linux Kernel Out-of-Bounds Write Vulnerability4.7 · Actively exploited
- CVE-2025-39682Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability5.8 · Actively exploited
- CVE-2026-53362Linux Kernel Unspecified Vulnerability4.3 · Actively exploited
- CVE-2022-0995Linux Kernel Out-of-Bounds Write Vulnerability4.6 · Actively exploited
- CVE-2022-0492Linux Kernel Improper Authentication Vulnerability4.5 · Actively exploited