CyberSecBulletin
CVE-2026-23076NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-23076 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 6524205326e0c1a21263b5c14e48e14ef7e449ae, afca7ff5d5d4d63a1acb95461f55ca9a729feedf, 8c1d09806e1441bc6a54b9a4f2818918046d5174 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 0.18% 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 6524205326e0c1a21263b5c14e48e14ef7e449ae or afca7ff5d5d4d63a1acb95461f55ca9a729feedf or 8c1d09806e1441bc6a54b9a4f2818918046d5174 or a8c42d11b0526a89192bd2f79facb4c60c8a1f38, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.249 or 5.15.199 or 6.1.162 or 6.6.122, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux8cc72361481f00253f1e468ade5795427386d593 up to, but not including, 6524205326e0c1a21263b5c14e48e14ef7e449ae; 8cc72361481f00253f1e468ade5795427386d593 up to, but not including, afca7ff5d5d4d63a1acb95461f55ca9a729feedf; 8cc72361481f00253f1e468ade5795427386d593 up to, but not including, 8c1d09806e1441bc6a54b9a4f2818918046d5174; 8cc72361481f00253f1e468ade5795427386d593 up to, but not including, a8c42d11b0526a89192bd2f79facb4c60c8a1f38; 8cc72361481f00253f1e468ade5795427386d593 up to, but not including, d77ba72558cd66704f0fb7e0969f697e87c0f71c; 8cc72361481f00253f1e468ade5795427386d593 up to, but not including, 873e2360d247eeee642878fcc3398babff7e387c; 8cc72361481f00253f1e468ade5795427386d593 up to, but not including, 61006c540cbdedea83b05577dc7fb7fa18fe1276; 2.6.316524205326e0c1a21263b5c14e48e14ef7e449ae, afca7ff5d5d4d63a1acb95461f55ca9a729feedf, 8c1d09806e1441bc6a54b9a4f2818918046d5174, a8c42d11b0526a89192bd2f79facb4c60c8a1f38, d77ba72558cd66704f0fb7e0969f697e87c0f71c, 873e2360d247eeee642878fcc3398babff7e387c
LinuxLinux Kernel2.6.31 up to, but not including, 5.10.249; 5.11 up to, but not including, 5.15.199; 5.16 up to, but not including, 6.1.162; 6.2 up to, but not including, 6.6.122; 6.7 up to, but not including, 6.12.68; 6.13 up to, but not including, 6.18.8; 6.195.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.68, 6.18.8

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: ALSA: ctxfi: Fix potential OOB access in audio mixer handling In the audio mixer handling code of ctxfi driver, the conf field is used as a kind of loop index, and it's referred in the index callbacks (amixer_index() and sum_index()). As spotted recently by fuzzers, the current code causes OOB access at those functions. | UBSAN: array-index-out-of-bounds in /build/reproducible-path/linux-6.17.8/sound/pci/ctxfi/ctamixer.c:347:48 | index 8 is out of range for type 'unsigned char [8]' After the analysis, the cause was found to be the lack of the proper (re-)initialization of conj field. This patch addresses those OOB accesses by adding the proper initializations of the loop indices.

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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