CVE-2026-31464scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 before d842348f8a00d5b1d7358f207eb34ffcf5b16df3; from 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 before a007246cb6c9ebdc93dafbf63cc2d43d98f402cc; from 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 before 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89; 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 builds before 4ed727e35b0ab17d3eeeb1e8023768396e2be161; from 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 before d1466bf991b2343cf2ba8336e440c8faf3cbb780; from 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 before 786f10b1966e485046839f992e89f2c18cbd1983; from 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 before bae4df0a643fa7f84663473aa3082a9c2ed139db; 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 builds before 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f | CNA record |
linux linux_kernel linux:linux_kernel | from 2.6.27 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.131; from 6.7 before 6.12.80; from 6.13 before 6.18.21; from 6.19 before 6.19.11; 7.0; and 4 more ranges | NVD |
References
- https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3patch
- https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402ccpatch
- https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89patch
- https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161patch
- https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780patch
- https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983patch
- https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139dbpatch
- https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362fpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.