CVE-2026-23076 [High] | Out-of-bounds Read in Linux Kernel

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-02-05	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-02-05

—

0.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.1	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	5.2	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.1

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

5.2

[email protected]

OS Trackers for CVE-2026-23076

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2026-23076 not yet assigned priority: Debian including 2 source packages (linux, linux-6.1), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6.	https://security-tracker.debian.org/tracker/CVE-2026-23076
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2026-23076
`suse`	medium	CVE-2026-23076 severity moderate: SUSE including 397 source package names (2.1.3-6.124:kernel-default-base-6.4.0-40.1.21.17, 2.1.3-7.105:kernel-default-6.4.0-40.1, …), 569 product×package rows across 32 product lines (Container suse/sl-micro/6.0/base-os-container, Container suse/sl-micro/6.0/kvm-os-container, … (32 product lines)): Fixed 308, Known Affected 231, First Fixed 25, Known Not Affected 5.	https://www.suse.com/security/cve/CVE-2026-23076/
`ubuntu`	medium	CVE-2026-23076 medium priority: Ubuntu including 157 source packages (linux, linux-allwinner-5.19, …), 1256 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): DNE 871, ignored 173, released 102, needed 94, pending 16.	https://ubuntu.com/security/CVE-2026-23076

Affected software / configurations for CVE-2026-23076

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 2.6.31, < 5.10.249	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.199	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.1.162	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.2, < 6.6.122	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.7, < 6.12.68	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.13, < 6.18.8	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc1::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc2::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc3::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc4::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc5::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc6::::::

References for CVE-2026-23076

URL	Tags
https://git.kernel.org/stable/c/61006c540cbdedea83b05577dc7fb7fa18fe1276	Patch
https://git.kernel.org/stable/c/6524205326e0c1a21263b5c14e48e14ef7e449ae	Patch
https://git.kernel.org/stable/c/873e2360d247eeee642878fcc3398babff7e387c	Patch
https://git.kernel.org/stable/c/8c1d09806e1441bc6a54b9a4f2818918046d5174	Patch
https://git.kernel.org/stable/c/a8c42d11b0526a89192bd2f79facb4c60c8a1f38	Patch
https://git.kernel.org/stable/c/afca7ff5d5d4d63a1acb95461f55ca9a729feedf	Patch
https://git.kernel.org/stable/c/d77ba72558cd66704f0fb7e0969f697e87c0f71c	Patch

URL

CVE-2026-23076 | ALSA: ctxfi: Fix potential OOB access in audio mixer handling

Exploit prediction scoring system (EPSS) score for CVE-2026-23076

Common vulnerability scoring system (CVSS) metrics for CVE-2026-23076

Weakness enumeration for CVE-2026-23076

OS Trackers for CVE-2026-23076

Affected software / configurations for CVE-2026-23076

References for CVE-2026-23076