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CVE-2026-97503

Linux: genirq/proc: Size interrupt directory names for 10-digit interrupt numbers

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.16%Chance of exploitation activity in the next 30 days, higher than 4% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in488bcd7fd3e9a2ad647b71b505a269fdb28753c4Fixed versionCVE List
Published24 Sep 2026Updated 21 Oct 2026CVE List

What fixes it

  • 488bcd7fd3e9a2ad647b71b505a269fdb28753c4LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 10

  • Linuxaffected: 721255b9826bd11c7a38b585905fc2dd0fb94e52 before a8adf64fe7fd5d7c476769a043ee56eda7b775ceCVE List
  • Linuxaffected: 721255b9826bd11c7a38b585905fc2dd0fb94e52 before 488bcd7fd3e9a2ad647b71b505a269fdb28753c4CVE List
  • Linuxaffected: 721255b9826bd11c7a38b585905fc2dd0fb94e52 before d4b22fbae70037299e96539c330e4a1054b28a91CVE List
  • Linuxaffected: 721255b9826bd11c7a38b585905fc2dd0fb94e52 before c2c7983c93f5d86962318be7e7298f1bc3feb1a6CVE List
  • Linuxaffected: 6.5CVE List
  • Linuxunaffected: all versions before 6.5CVE List
  • Linuxunaffected: 6.6.160 through 6.6.*CVE List
  • Linuxunaffected: 6.12.114 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2CVE List

References 4