CVE-2026-31491: Linux kernel · RDMA/irdma: Harden depth calculation functions
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in e37afcb56ae070477741fe2d6e61fc0c542cce2d : update Linux kernel when convenient.
Data as of 5 Nov 2026, 22:21 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-05.
- Patch
- Available – fixed in e37afcb56ae070477741fe2d6e61fc0c542cce2d, cbd852f5700eb3f64392452faf693ac45cae8281, 3f08351de5ca4f2f724b86ad252fbc21289467e1
Exploitation evidence
Disclosed: evidence found.
CVE published 22 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 5 Nov 2026.
What to do
Upgrade Linux kernel to e37afcb56ae070477741fe2d6e61fc0c542cce2d, cbd852f5700eb3f64392452faf693ac45cae8281 or 3f08351de5ca4f2f724b86ad252fbc21289467e1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix has been implemented in the Linux kernel by hardening the depth calculation functions to use 64-bit sizes for all calculations and boundary checks. Users should update to the fixed kernel versions identified by the commits e37afcb56ae070477741fe2d6e61fc0c542cce2d, cbd852f5700eb3f64392452faf693ac45cae8281, and 3f08351de5ca4f2f724b86ad252fbc21289467e1. No additional mitigation steps are indicated.
Description
A vulnerability in the Linux kernel's RDMA/irdma subsystem allowed integer overflow and truncation in depth calculations for SQ/RQ/SRQ sizes when the OS passed U32_MAX. This could cause the system to incorrectly return success for invalid sizes. The issue has been fixed by hardening the depth calculation functions to use 64-bit sizes for boundary checking.