VulnerabilityPublished 4 Feb 2026Updated 19 Oct 2026

CVE-2026-23076: Linux kernel · Out-of-bounds Read

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in d77ba72558cd66704f0fb7e0969f697e87c0f71c : update Linux kernel when convenient.

Data as of 26 Oct 2026, 11:07 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS

0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-06-10.

Patch

Available – fixed in d77ba72558cd66704f0fb7e0969f697e87c0f71c, afca7ff5d5d4d63a1acb95461f55ca9a729feedf, a8c42d11b0526a89192bd2f79facb4c60c8a1f38 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 4 Feb 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 24 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 8cc72361481f00253f1e468ade5795427386d593, < d77ba72558cd66704f0fb7e0969f697e87c0f71c	Fixed in d77ba72558cd66704f0fb7e0969f697e87c0f71c
LinuxLinux	Affected ≥ 8cc72361481f00253f1e468ade5795427386d593, < afca7ff5d5d4d63a1acb95461f55ca9a729feedf	Fixed in afca7ff5d5d4d63a1acb95461f55ca9a729feedf
LinuxLinux	Affected ≥ 8cc72361481f00253f1e468ade5795427386d593, < a8c42d11b0526a89192bd2f79facb4c60c8a1f38	Fixed in a8c42d11b0526a89192bd2f79facb4c60c8a1f38
LinuxLinux	Affected ≥ 8cc72361481f00253f1e468ade5795427386d593, < 6524205326e0c1a21263b5c14e48e14ef7e449ae	Fixed in 6524205326e0c1a21263b5c14e48e14ef7e449ae
LinuxLinux	Affected ≥ 8cc72361481f00253f1e468ade5795427386d593, < 61006c540cbdedea83b05577dc7fb7fa18fe1276	Fixed in 61006c540cbdedea83b05577dc7fb7fa18fe1276
LinuxLinux	Affected ≥ 8cc72361481f00253f1e468ade5795427386d593, < 873e2360d247eeee642878fcc3398babff7e387c	Fixed in 873e2360d247eeee642878fcc3398babff7e387c

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.

CWE-125Out-of-bounds Read (opens in a new tab)
Base weaknessCWE Top 25 (2025): #8
The product reads data past the end, or before the beginning, of the intended buffer.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Architecture and Design · Language Selection
Use a language that provides appropriate memory abstractions.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Overread Buffers (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

WeaknessesCWE-125

Technical details

References

Community reviews

Related threats