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CVE-2026-98837

ALSA: caiaq: unregister the input device when probe fails

Products / packages Linux

Published

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Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 22:45:30 UTC

Severity

unknown

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

The Linux kernel has a vulnerability in the ALSA caiaq module, where the input device is not unregistered when probe fails, leading to a use-after-free error. Affected versions include 5.10.258 to 5.10.273, 5.15.209 to 5.15.224, 6.1.175 to 6.1.191, 6.6.140 to 6.6.160, 6.12.86 to 6.12.113, 6.18.27 to 6.18.56, and 7.0.4 to 7.1. The vulnerability requires local access to the system.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

16 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

da938aa9fc7826901921dcea225948ab21a97e45 → before 7017c9dda1ebbab428a6fd29c841596b5c9c84d1

git versions

09616e25f502080ba684fc7fcf959d1376ab756d → before 8315ea07ebb2497531ff42dd640396f6f1d4a8f0

git versions

b956e48371f2ff72b76be9a829800ecec963bd45 → before 1d5d194594ff616ad36a052bde739d1cf5855b95

git versions

f537e3ad69609f6924a4db6b4a7f6561f5288bdd → before df2787819bd137111b56b8631dd581b0cce7144d

git versions

6251e3e256337a30160ef59ab1580dde4d1acd28 → before 850810c12686f80cdf7530f4f21e0157d904f739

git versions

e59ecd4ee3a450db6cb4e4ecaa3efdd593f80056 → before 84727facd8506140cd04f2b0a8b1c4ddeac41cea

git versions

28abd224db4a49560b452115bca3672a20e45b2f → before 2e5a413cc2a489c9427ecd3d73ad764bfb0c7103

git versions

28abd224db4a49560b452115bca3672a20e45b2f → before 0b7bd20f6379bc5e431fd74d866390f5b5b63f3c

git versions

096dd8519cf2f768e9e14f224b627f7aaee1a9c5

git versions

5.10.258 → before 5.10.273

semver versions

5.15.209 → before 5.15.224

semver versions

6.1.175 → before 6.1.191

semver versions

6.6.140 → before 6.6.160

semver versions

6.12.86 → before 6.12.113

semver versions

6.18.27 → before 6.18.56

semver versions

7.0.4 → before 7.1

semver versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

10 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

7.1

unaffected

0 → before 7.1

semver versions

5.10.273 → through 5.10.*

semver versions

5.15.224 → through 5.15.*

semver versions

6.1.191 → through 6.1.*

semver versions

6.6.160 → through 6.6.*

semver versions

6.12.113 → through 6.12.*

semver versions

6.18.56 → through 6.18.*

semver versions

7.2.10 → through 7.2.*

semver versions

7.3 → through *

original_commit_for_fix versions

unknown

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

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

ALSA: caiaq: unregister the input device when probe fails

setup_card() registers the input device, whose name and phys point into struct snd_usb_caiaqdev, and then goes on to snd_card_register() and snd_usb_caiaq_control_init(). If either fails, snd_probe() calls snd_card_free(), which frees the device state but leaves the input device registered: card_free() only clears the pointer, and the input device is unregistered from snd_disconnect() alone. Reading its "uevent" attribute afterwards dereferences freed memory:

BUG: KASAN: slab-use-after-free in string+0x4a9/0x4f0 Read of size 1 at addr ffff8880208f5043 by task caiaq/4967 add_uevent_var+0x183/0x3a0 input_dev_uevent+0x162/0x900 dev_uevent+0x2f1/0x870 uevent_show+0x1ca/0x3a0 ...

Unregister the input device on the probe error path, as snd_disconnect() does. snd_usb_caiaq_input_disconnect() is a no-op when no input device was registered.

Reproduced with a raw-gadget Audio Kontrol 1 and a temporary hack that makes snd_usb_caiaq_control_init() fail.

References

8 sources
git.kernel.org/stable/c/7017c9dda1ebbab428a6fd29c841596b5c9c84d1
Source referenceLinux
git.kernel.org/stable/c/8315ea07ebb2497531ff42dd640396f6f1d4a8f0
Source referenceLinux
git.kernel.org/stable/c/1d5d194594ff616ad36a052bde739d1cf5855b95
Source referenceLinux
git.kernel.org/stable/c/df2787819bd137111b56b8631dd581b0cce7144d
Source referenceLinux
git.kernel.org/stable/c/850810c12686f80cdf7530f4f21e0157d904f739
Source referenceLinux
git.kernel.org/stable/c/84727facd8506140cd04f2b0a8b1c4ddeac41cea
Source referenceLinux
View 2 more references
git.kernel.org/stable/c/2e5a413cc2a489c9427ecd3d73ad764bfb0c7103
Source referenceLinux
git.kernel.org/stable/c/0b7bd20f6379bc5e431fd74d866390f5b5b63f3c
Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification · not supplied
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-98837

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.10.258

Before: 5.10.273

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.15.209

Before: 5.15.224

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.1.175

Before: 6.1.191

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.6.140

Before: 6.6.160

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.12.86

Before: 6.12.113

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.18.27

Before: 6.18.56

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 7.1

Before: 7.2.10

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 7.1

Before: 7.3

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 7.0.4

Applicability preview
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    "nodes": [
      {
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        "negate": false,
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            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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            "vulnerable": true,
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          {
            "vulnerable": true,
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            "versionStartIncluding": "7.0.4"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 1
Linux

Assigning organization

2026-10-30

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

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No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

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