What’s Vulnerable › Vulnerabilities

CVE-2026-93222: signal: avoid shared siginfo namespace rewrites

• 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: 2026-09-24 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: signal: avoid shared siginfo namespace rewrites send_signal_locked() rewrites sender ids for the target namespace. Group sends reuse the same siginfo, so one recipient can affect the next. Copy the siginfo before changing it.

Affected products

• Linux kernel: from 5.1.20 before 5.2; from 5.2.3 before 5.3; 5.3 — fixed in 5.2, 5.3, 7.3

How to fix

Upgrade to a fixed version: Linux kernel 5.2, 5.3, 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/03c8761e75d1619906bb503686f9cc1dfc6a67f4
• https://git.kernel.org/stable/c/148b0dae2a1755beb873a2aab51fb191414f068c
• https://git.kernel.org/stable/c/4ee7c4e4719a825052f42f02ec159b5b42b68fbc
• https://git.kernel.org/stable/c/6b1de022304ef85284c5933a5fb8492f6f54efc9
• https://git.kernel.org/stable/c/a246da20c8e4ae4319511c698b9f26ad0ad1769f
• https://git.kernel.org/stable/c/b655c2040ce836afad5643842543567b31f8c11d
• https://git.kernel.org/stable/c/d19cdc167e696714509e87d3f7ae765b6e164589
• https://git.kernel.org/stable/c/e015d1ac6b43a23c52c5163299414ae77d7d4ae0

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