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CVE-2026-31391: crypto: atmel-sha204a - Fix OOM ->tfm_count leak

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-03 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: atmel-sha204a - Fix OOM ->tfm_count leak If memory allocation fails, decrement ->tfm_count to avoid blocking future reads.

Affected products

• Linux kernel: from 5.3 before 5.10.253; from 5.11 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.20; from 6.19 before 6.19.10 — fixed in 5.10.253, 6.1.167, 6.12.78, 6.18.20, 6.19.10, 6.6.130

How to fix

Upgrade to a fixed version: Linux kernel 5.10.253, 6.1.167, 6.12.78, 6.18.20. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1ab70c260cf16f931a728b2cb63fff5f38c814d8
• https://git.kernel.org/stable/c/2bfc83cee05f8b9604502df27d94e8e2b4a3dbf1
• https://git.kernel.org/stable/c/66ee9c1c3575b5d6afc340faca00fd40ed5b7ad9
• https://git.kernel.org/stable/c/6f502049a96b368ea6646c49d9520d6f69a101fa
• https://git.kernel.org/stable/c/c2d0c45dbb9eb272385ae919b17eef5a5318d3f8
• https://git.kernel.org/stable/c/d240b079a37e90af03fd7dfec94930eb6c83936e
• https://git.kernel.org/stable/c/fd262dc6d758232511127372eba866b7600739ba
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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