CyberSecBulletin
CVE-2026-63838NVD status: Analyzed

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-63838 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 9f1daac27ca28e98c8c0e4450de42bb68d547250, 15e7b2ac2455995a6af02b9d3da7a432837aaf72, 134c61925e9e9ee0f4fdbab5c3984d5bb024f5f5 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 0.14% 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 9f1daac27ca28e98c8c0e4450de42bb68d547250 or 15e7b2ac2455995a6af02b9d3da7a432837aaf72 or 134c61925e9e9ee0f4fdbab5c3984d5bb024f5f5 or a62b3e6e42359a79158c134e3cf5c74fe160c3f5, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 6.6.141 or 6.12.91 or 6.18.33 or 7.0.10, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux547b02f74e4ac1e7d295a6266d5bc93a647cd4ac up to, but not including, 9f1daac27ca28e98c8c0e4450de42bb68d547250; 547b02f74e4ac1e7d295a6266d5bc93a647cd4ac up to, but not including, 15e7b2ac2455995a6af02b9d3da7a432837aaf72; 547b02f74e4ac1e7d295a6266d5bc93a647cd4ac up to, but not including, 134c61925e9e9ee0f4fdbab5c3984d5bb024f5f5; 547b02f74e4ac1e7d295a6266d5bc93a647cd4ac up to, but not including, a62b3e6e42359a79158c134e3cf5c74fe160c3f5; 547b02f74e4ac1e7d295a6266d5bc93a647cd4ac up to, but not including, f9e437cddf6cf9e603bdaefe148c1f4792aaf39c; 6.69f1daac27ca28e98c8c0e4450de42bb68d547250, 15e7b2ac2455995a6af02b9d3da7a432837aaf72, 134c61925e9e9ee0f4fdbab5c3984d5bb024f5f5, a62b3e6e42359a79158c134e3cf5c74fe160c3f5, f9e437cddf6cf9e603bdaefe148c1f4792aaf39c
LinuxLinux Kernel6.6 up to, but not including, 6.6.141; 6.7 up to, but not including, 6.12.91; 6.13 up to, but not including, 6.18.33; 6.19 up to, but not including, 7.0.106.6.141, 6.12.91, 6.18.33, 7.0.10

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
LowA basic user account is enough.
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:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.

Official description

In the Linux kernel, the following vulnerability has been resolved: ASoC: rsnd: Fix potential out-of-bounds access of component_dais[] component_dais[RSND_MAX_COMPONENT] is initially zero-initialized and later populated in rsnd_dai_of_node(). However, the existing boundary check: if (i >= RSND_MAX_COMPONENT) does not guarantee that the last valid element remains zero. As a result, the loop can rely on component_dais[RSND_MAX_COMPONENT] being zero, which may lead to an out-of-bounds access. Found by Linux Verification Center (linuxtesting.org) with SVACE.

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. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

Spotted an error? Tell us.