What happened
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 versions
Linux: 721255b9826bd11c7a38b585905fc2dd0fb94e52 through before d4b22fbae70037299e96539c330e4a1054b28a91 (git); 721255b9826bd11c7a38b585905fc2dd0fb94e52 through before c2c7983c93f5d86962318be7e7298f1bc3feb1a6 (git); 6.5 Fixed: See vendor advisory.
Why it matters
Review the vendor advisory and exposure of the affected product to determine operational impact.
Detection & mitigation
- Apply vendor-provided updates or mitigations.
- Review affected product exposure and access logs.
Public PoC references
No public PoC reference has passed the current publication threshold.