What’s Vulnerable › Vulnerabilities

CVE-2026-97503: genirq/proc: Size interrupt directory names for 10-digit interrupt numbers

• 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 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: genirq/proc: Size interrupt directory names for 10-digit interrupt numbers /proc/irq/<n>/ directory names are built in `char name[10]` buffers with `sprintf(name, "%u", irq)`. Ten-digit IRQ numbers already need 11 bytes including the trailing NUL, and current sparse-IRQ configurations allow interrupt numbers in that range. Size the temporary name buffer for the current decimal form and switch to bounded formatting when creating or removing the proc entry.

Affected products

• Linux kernel: 6.5 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/488bcd7fd3e9a2ad647b71b505a269fdb28753c4
• https://git.kernel.org/stable/c/a8adf64fe7fd5d7c476769a043ee56eda7b775ce
• https://git.kernel.org/stable/c/c2c7983c93f5d86962318be7e7298f1bc3feb1a6
• https://git.kernel.org/stable/c/d4b22fbae70037299e96539c330e4a1054b28a91

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