CyberSecBulletin
CVE-2026-68255NVD status: Received

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-68255 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.7 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, without any action from a user. The record lists versions 65ce911f341ad8ff0c08922eff5bb6db75666eb0, 64bedd2758eccbc74d39f7006a7ec16fa39dc901, 3f506a85a905b080cadc029a1651a310479090a6 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 0.19% 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 65ce911f341ad8ff0c08922eff5bb6db75666eb0 or 64bedd2758eccbc74d39f7006a7ec16fa39dc901 or 3f506a85a905b080cadc029a1651a310479090a6 or 9fc2a017c5d597937e0c28b9a9669844aa796c42, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxb4b01b4995fb15b55a2d067eb405917f5ab32709 up to, but not including, 65ce911f341ad8ff0c08922eff5bb6db75666eb0; b4b01b4995fb15b55a2d067eb405917f5ab32709 up to, but not including, 64bedd2758eccbc74d39f7006a7ec16fa39dc901; b4b01b4995fb15b55a2d067eb405917f5ab32709 up to, but not including, 3f506a85a905b080cadc029a1651a310479090a6; b4b01b4995fb15b55a2d067eb405917f5ab32709 up to, but not including, 9fc2a017c5d597937e0c28b9a9669844aa796c42; b4b01b4995fb15b55a2d067eb405917f5ab32709 up to, but not including, 2757e6e803092cf0aeaf4b735e16b5d3bdc705c5; b4b01b4995fb15b55a2d067eb405917f5ab32709 up to, but not including, 35be0e2c6862abcd5e5f5445261f1fd910d4a9b4; b4b01b4995fb15b55a2d067eb405917f5ab32709 up to, but not including, 375c1934ef0196d3b6d3a1eae3232bef8dae7bf7; b4b01b4995fb15b55a2d067eb405917f5ab32709 up to, but not including, 4e1a53892ba7f8a3e1da6bfc53c83ae7c812dccd; and 1 more ranges65ce911f341ad8ff0c08922eff5bb6db75666eb0, 64bedd2758eccbc74d39f7006a7ec16fa39dc901, 3f506a85a905b080cadc029a1651a310479090a6, 9fc2a017c5d597937e0c28b9a9669844aa796c42, 2757e6e803092cf0aeaf4b735e16b5d3bdc705c5, 35be0e2c6862abcd5e5f5445261f1fd910d4a9b4

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
LocalThe attacker needs local access or must trick a user into running something.
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:L/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: drm/virtio: bound EDID block reads to the response buffer virtio_get_edid_block() validates the read offset only against the device-supplied resp->size field, never against the fixed-size resp->edid array. The EDID block index is driven by the device-supplied extension count, so a malicious virtio-gpu backend can advertise a large size together with a high block count and read far past the array into adjacent kernel memory, which is then surfaced in the parsed EDID (an out-of-bounds read / info leak). Also reject any read whose end exceeds the size of the edid array. Conforming EDID responses stay within the array and are unaffected.

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

Spotted an error? Tell us.