Vulnerability details
CVE-2026-31464
scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
Official description
In the Linux kernel, the following vulnerability has been resolved: scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done() A malicious or compromised VIO server can return a num_written value in the discover targets MAD response that exceeds max_targets. This value is stored directly in vhost->num_targets without validation, and is then used as the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which is only allocated for max_targets entries. Indices at or beyond max_targets access kernel memory outside the DMA-coherent allocation. The out-of-bounds data is subsequently embedded in Implicit Logout and PLOGI MADs that are sent back to the VIO server, leaking kernel memory. Fix by clamping num_written to max_targets before storing it.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.1High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 2.6.27 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 ≤ v < a007246cb6c9ebdc93dafbf63cc2d43d98f402cc | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 ≤ v < 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 ≤ v < 4ed727e35b0ab17d3eeeb1e8023768396e2be161 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 ≤ v < d842348f8a00d5b1d7358f207eb34ffcf5b16df3 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 ≤ v < 786f10b1966e485046839f992e89f2c18cbd1983 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 ≤ v < bae4df0a643fa7f84663473aa3082a9c2ed139db | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 ≤ v < 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 ≤ v < d1466bf991b2343cf2ba8336e440c8faf3cbb780 | CVEProject cvelistV5 (CNA) |
References and advisories
8- https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3
- https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc
- https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89
- https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161
- https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780
- https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983
- https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db
- https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f
Details
- Published
- 2026-04-22
- Last updated
- 2026-10-19
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-125Out-of-bounds Read