CVE-2026-97503: Linux kernel · genirq/proc: Size interrupt directory names for 10-digit interrupt numbers
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in d4b22fbae70037299e96539c330e4a1054b28a91 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 20:13 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in d4b22fbae70037299e96539c330e4a1054b28a91, c2c7983c93f5d86962318be7e7298f1bc3feb1a6, a8adf64fe7fd5d7c476769a043ee56eda7b775ce +1
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade Linux kernel to d4b22fbae70037299e96539c330e4a1054b28a91, c2c7983c93f5d86962318be7e7298f1bc3feb1a6, a8adf64fe7fd5d7c476769a043ee56eda7b775ce or 488bcd7fd3e9a2ad647b71b505a269fdb28753c4.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available and has been applied in the Linux kernel. Users should update to the fixed kernel versions identified by the commits d4b22fbae70037299e96539c330e4a1054b28a91, c2c7983c93f5d86962318be7e7298f1bc3feb1a6, a8adf64fe7fd5d7c476769a043ee56eda7b775ce, and 488bcd7fd3e9a2ad647b71b505a269fdb28753c4. No additional mitigation is required beyond applying these patches.
Description
A vulnerability in the Linux kernel's genirq/proc subsystem involves improper sizing of interrupt directory names for 10-digit interrupt numbers. The directory names under /proc/irq/<n>/ are constructed using a fixed-size buffer of 10 bytes, which is insufficient for 10-digit IRQ numbers requiring 11 bytes including the null terminator. This can lead to buffer overflows when handling large IRQ numbers. The issue has been fixed by resizing the buffer and using bounded formatting to safely create or remove proc entries.
References
- git.kernel.org/stable/c/a8adf64fe7fd5d7c476769a043ee56eda7b775ce (opens in a new tab)
- git.kernel.org/stable/c/488bcd7fd3e9a2ad647b71b505a269fdb28753c4 (opens in a new tab)
- git.kernel.org/stable/c/d4b22fbae70037299e96539c330e4a1054b28a91 (opens in a new tab)
- git.kernel.org/stable/c/c2c7983c93f5d86962318be7e7298f1bc3feb1a6 (opens in a new tab)