CVE-2026-93039 - Vulnerability Details

- ASoC: meson: Keep link pointers valid on realloc failure

Description

In the Linux kernel, the following vulnerability has been resolved:

ASoC: meson: Keep link pointers valid on realloc failure

meson_card_reallocate_links() grows the DAI link and private data
arrays with two consecutive krealloc() calls and updates the owner
pointers only after both calls have succeeded.

A successful krealloc() may move the data: it frees the old block and
returns a new one. When that happens for the link array and the second
krealloc() then fails, card->dai_link still points to the block that
krealloc() already freed, and the error path frees the new block too.
The probe error path then calls meson_card_clean_references(), which
dereferences card->dai_link and kfree()s it again, resulting in a
use-after-free and a double free.

Commit card->dai_link and card->num_links right after the first
krealloc() succeeds, so the pointer always refers to a valid allocation
that meson_card_clean_references() can walk and free. krealloc() with
__GFP_ZERO zero-initializes the added entries, so walking them on the
error path is safe. With both failure paths reduced to a plain return,
drop the goto labels and the error message.

Published: 2026-09-17

Score: 7.4 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The flaw causes a use‑after‑free and double free in the Linux ASoC meson driver during dynamic array reallocation. When the first krealloc() succeeds and the second fails, the driver frees a block that has already been freed, leaving card->dai_link pointing to an invalid block. The error path then dereferences that stale pointer, corrupting kernel memory. Based on the description, it is inferred that an attacker who can force this allocation sequence may crash the kernel or inject code, potentially escalating privileges.

Affected Systems

Any Linux kernel that includes the meson audio driver without the recent patch, regardless of distribution, is affected. No specific release lines are listed, so all unpatched kernel versions that contain the vulnerable code are vulnerable.

Risk and Exploitability

The CVSS score of 7.4 indicates a serious risk. The EPSS score of <1% shows that the likelihood of exploitation is very low at present, and the vulnerability is not listed in the CISA KEV catalog. Based on the description, it is inferred that the flaw could be exploitable locally by an attacker able to trigger the reallocation failure path, but no public exploit is known.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`7864a79f37b55769b817d5e6c5ae0ca4bfdba93b`	affected	< de33afc57f24538186bccf4c4f6c65dd38634fd8
`7864a79f37b55769b817d5e6c5ae0ca4bfdba93b`	affected	< 1c1485343b7c1c39dab7ecb9cd16ba49fd0ce642
`7864a79f37b55769b817d5e6c5ae0ca4bfdba93b`	affected	< 8db0a0fc84e80aa9924e0833aef6cc95df94e5a7
`7864a79f37b55769b817d5e6c5ae0ca4bfdba93b`	affected	< 41e92e0caa1fe3df2efaca346bfcaeb7fb9826ab
`7864a79f37b55769b817d5e6c5ae0ca4bfdba93b`	affected	< 0b30fbe6bf7cf6499b19dd886f466e7c9e820089
`7864a79f37b55769b817d5e6c5ae0ca4bfdba93b`	affected	< 8fec16898f184e5f8f8fdd09ff1ced2bd7ffc13d
`7864a79f37b55769b817d5e6c5ae0ca4bfdba93b`	affected	< 5ed1b048527bebe4529eb6e01c34dcc5d97ba5fe
`7864a79f37b55769b817d5e6c5ae0ca4bfdba93b`	affected	< 2aaa41cf974f83a6fb105422bac4e2f107150774

Linux

affected

Version	Status	Constraints
`4.19`	affected	—
`0`	unaffected	< 4.19
`5.10.270`	unaffected	≤ 5.10.*
`5.15.221`	unaffected	≤ 5.15.*
`6.1.188`	unaffected	≤ 6.1.*
`6.6.157`	unaffected	≤ 6.6.*
`6.12.110`	unaffected	≤ 6.12.*
`6.18.52`	unaffected	≤ 6.18.*
`7.2.6`	unaffected	≤ 7.2.*
`7.3-rc1`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[7864a79f37b55769b817d5e6c5ae0ca4bfdba93b,de33afc57f24538186bccf4c4f6c65dd38634fd8)`	affected	code_commit	—
`[7864a79f37b55769b817d5e6c5ae0ca4bfdba93b,1c1485343b7c1c39dab7ecb9cd16ba49fd0ce642)`	affected	code_commit	—
`[7864a79f37b55769b817d5e6c5ae0ca4bfdba93b,8db0a0fc84e80aa9924e0833aef6cc95df94e5a7)`	affected	code_commit	—
`[7864a79f37b55769b817d5e6c5ae0ca4bfdba93b,41e92e0caa1fe3df2efaca346bfcaeb7fb9826ab)`	affected	code_commit	—
`[7864a79f37b55769b817d5e6c5ae0ca4bfdba93b,0b30fbe6bf7cf6499b19dd886f466e7c9e820089)`	affected	code_commit	—
`[7864a79f37b55769b817d5e6c5ae0ca4bfdba93b,8fec16898f184e5f8f8fdd09ff1ced2bd7ffc13d)`	affected	code_commit	—
`[7864a79f37b55769b817d5e6c5ae0ca4bfdba93b,5ed1b048527bebe4529eb6e01c34dcc5d97ba5fe)`	affected	code_commit	—
`[7864a79f37b55769b817d5e6c5ae0ca4bfdba93b,2aaa41cf974f83a6fb105422bac4e2f107150774)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`4.19`	affected	generic	—
`[0,4.19)`	unaffected	generic	—
`[5.10.270,5.11.0)`	unaffected	semver	—
`[5.15.221,5.16.0)`	unaffected	semver	—
`[6.1.188,6.2.0)`	unaffected	semver	—
`[6.6.157,6.7.0)`	unaffected	semver	—
`[6.12.110,6.13.0)`	unaffected	semver	—
`[6.18.52,6.19.0)`	unaffected	semver	—
`[7.2.6,7.3.0)`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	generic	—

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Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Update the Linux kernel to a patched release that incorporates the commit correcting the reallocation logic
Rebuild affected kernel modules to ensure the updated code is loaded
Reboot the system after the kernel update to finish applying the changes

Generated by OpenCVE AI on September 19, 2026 at 23:23 UTC.

Tracking

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Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DSA	DSA-6528-1	linux security update

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00168.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/0b30fbe6bf7cf6499b19dd886f466e7c9e820089
https://git.kernel.org/stable/c/1c1485343b7c1c39dab7ecb9cd16ba49fd0ce642
https://git.kernel.org/stable/c/2aaa41cf974f83a6fb105422bac4e2f107150774
https://git.kernel.org/stable/c/41e92e0caa1fe3df2efaca346bfcaeb7fb9826ab
https://git.kernel.org/stable/c/5ed1b048527bebe4529eb6e01c34dcc5d97ba5fe
https://git.kernel.org/stable/c/8db0a0fc84e80aa9924e0833aef6cc95df94e5a7
https://git.kernel.org/stable/c/8fec16898f184e5f8f8fdd09ff1ced2bd7ffc13d
https://git.kernel.org/stable/c/de33afc57f24538186bccf4c4f6c65dd38634fd8

History

Sat, 19 Sep 2026 23:45:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-416

Sat, 19 Sep 2026 17:15:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-415 CWE-416

Sat, 19 Sep 2026 06:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-415 CWE-416

Fri, 18 Sep 2026 21:30:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 7.4, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}`

Thu, 17 Sep 2026 16:30:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: ASoC: meson: Keep link pointers valid on realloc failure meson_card_reallocate_links() grows the DAI link and private data arrays with two consecutive krealloc() calls and updates the owner pointers only after both calls have succeeded. A successful krealloc() may move the data: it frees the old block and returns a new one. When that happens for the link array and the second krealloc() then fails, card->dai_link still points to the block that krealloc() already freed, and the error path frees the new block too. The probe error path then calls meson_card_clean_references(), which dereferences card->dai_link and kfree()s it again, resulting in a use-after-free and a double free. Commit card->dai_link and card->num_links right after the first krealloc() succeeds, so the pointer always refers to a valid allocation that meson_card_clean_references() can walk and free. krealloc() with __GFP_ZERO zero-initializes the added entries, so walking them on the error path is safe. With both failure paths reduced to a plain return, drop the goto labels and the error message.
Title		ASoC: meson: Keep link pointers valid on realloc failure
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/0b30fbe6bf7cf6499b19dd886f466e7c9e820089 https://git.kernel.org/stable/c/1c1485343b7c1c39dab7ecb9cd16ba49fd0ce642 https://git.kernel.org/stable/c/2aaa41cf974f83a6fb105422bac4e2f107150774 https://git.kernel.org/stable/c/41e92e0caa1fe3df2efaca346bfcaeb7fb9826ab https://git.kernel.org/stable/c/5ed1b048527bebe4529eb6e01c34dcc5d97ba5fe https://git.kernel.org/stable/c/8db0a0fc84e80aa9924e0833aef6cc95df94e5a7 https://git.kernel.org/stable/c/8fec16898f184e5f8f8fdd09ff1ced2bd7ffc13d https://git.kernel.org/stable/c/de33afc57f24538186bccf4c4f6c65dd38634fd8

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-09-17T16:10:32.812Z

Updated: 2026-09-18T17:55:42.991Z

Reserved: 2026-09-17T15:57:05.657Z

Link: CVE-2026-93039

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-09-17T17:17:56.977

Modified: 2026-09-18T18:18:18.750

Link: CVE-2026-93039

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-09-19T23:30:13Z

Weaknesses

CWE-416
Use After Free

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Local

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Subscriptions

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