8.1

CVE-2026-31464: scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()

Modified
AliasesUBUNTU-CVE-2026-31464DEBIAN-CVE-2026-31464
Published 22-04-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-31464 is a high (CVSS 8.1) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 19.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.1, adjacent network); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.27%
0%100%
Low · -0.14 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 39 · Related 37
MGASA-2026-0108MGASA-2026-0110SUSE-SU-2026:22043-1SUSE-SU-2026:22048-1SUSE-SU-2026:22076-1SUSE-SU-2026:22087-1

Timeline

  1. 22-04-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

Decrease -0.14 pp

From 0.42% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: adjacent network, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < d842348f8a00d5b1d7358f207eb34ffcf5b16df3 | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < a007246cb6c9ebdc93dafbf63cc2d43d98f402cc | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < 4ed727e35b0ab17d3eeeb1e8023768396e2be161 | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < d1466bf991b2343cf2ba8336e440c8faf3cbb780 | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < 786f10b1966e485046839f992e89f2c18cbd1983 | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < bae4df0a643fa7f84663473aa3082a9c2ed139db | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f | 2.6.27
  • linux_kernel≥ 2.6.27, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.168 | ≥ 6.2, < 6.6.131 | ≥ 6.7, < 6.12.80 | ≥ 6.13, < 6.18.21 | ≥ 6.19, < 6.19.11 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.11-1

3 vendors · 160 products

References

38 links
Show all 38 references