CyberSecBulletin
CVE-2026-31464NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-31464 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. The record lists versions d842348f8a00d5b1d7358f207eb34ffcf5b16df3, a007246cb6c9ebdc93dafbf63cc2d43d98f402cc, 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.27% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to d842348f8a00d5b1d7358f207eb34ffcf5b16df3 or a007246cb6c9ebdc93dafbf63cc2d43d98f402cc or 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 or 4ed727e35b0ab17d3eeeb1e8023768396e2be161, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.253 or 5.15.203 or 6.1.168 or 6.6.131, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux072b91f9c6510d0ec4a49d07dbc318760c7da7b3 up to, but not including, d842348f8a00d5b1d7358f207eb34ffcf5b16df3; 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 up to, but not including, a007246cb6c9ebdc93dafbf63cc2d43d98f402cc; 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 up to, but not including, 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89; 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 up to, but not including, 4ed727e35b0ab17d3eeeb1e8023768396e2be161; 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 up to, but not including, d1466bf991b2343cf2ba8336e440c8faf3cbb780; 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 up to, but not including, 786f10b1966e485046839f992e89f2c18cbd1983; 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 up to, but not including, bae4df0a643fa7f84663473aa3082a9c2ed139db; 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 up to, but not including, 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f; and 1 more rangesd842348f8a00d5b1d7358f207eb34ffcf5b16df3, a007246cb6c9ebdc93dafbf63cc2d43d98f402cc, 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89, 4ed727e35b0ab17d3eeeb1e8023768396e2be161, d1466bf991b2343cf2ba8336e440c8faf3cbb780, 786f10b1966e485046839f992e89f2c18cbd1983
LinuxLinux Kernel2.6.27 up to, but not including, 5.10.253; 5.11 up to, but not including, 5.15.203; 5.16 up to, but not including, 6.1.168; 6.2 up to, but not including, 6.6.131; 6.7 up to, but not including, 6.12.80; 6.13 up to, but not including, 6.18.21; 6.19 up to, but not including, 6.19.11; 7.05.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, 6.18.21

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
AdjacentThe attacker must be on the same local network segment.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H. Scored by CNA.

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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

How developers prevent this class of flaw

  • Use a language that provides appropriate memory abstractions.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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