CVE-2026-31776

Kernel out-of-bounds access via invalid SPDIFI1 index

Published May 1, 2026 · Updated May 1, 2026

Out-of-bounds access in Linux Kernel 6.19 before 6.19.12 allows local users to reach invalid kernel memory through the ALSA ctxfi driver. On hw20k2 devices, daio_device_index() returns -EINVAL for SPDIFI1 instead of index 1, and that value reaches an array access. The path requires an affected hw20k2 audio device and low-privileged local access; public sources do not identify whether the operation reads or writes memory.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux Kernel 6.19 before 6.19.12 allows local users to reach invalid kernel memory through the ALSA ctxfi driver. On hw20k2 devices, daio_device_index() returns -EINVAL for SPDIFI1 instead of index 1, and that value reaches an array access. The path requires an affected hw20k2 audio device and low-privileged local access; public sources do not identify whether the operation reads or writes memory.

The record

CVE
CVE-2026-31776
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-129
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28222e13666b5d26bf66563c056069ed32f87b33
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <57698f184e1afbe054b3cd30e2c43a67c11d7f5e
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5b39985303a639b159dea306a032c08ef22f029d
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <950decf59d4e978b60a792ce0b3e1555a608f489
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a0b45bdfffce9894b39392d061c14fda24de8b67
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a3b0e5f84058a9c3d0542a71c2b3a7801e4ee26a
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b045ab3dff97edae6d538eeff900a34c098761f8
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c8859675f1cf92fe2eb25ef525440702140a0b55

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28222e13666b5d26bf66563c056069ed32f87b33; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <57698f184e1afbe054b3cd30e2c43a67c11d7f5e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5b39985303a639b159dea306a032c08ef22f029d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <950decf59d4e978b60a792ce0b3e1555a608f489; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a0b45bdfffce9894b39392d061c14fda24de8b67; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a3b0e5f84058a9c3d0542a71c2b3a7801e4ee26a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b045ab3dff97edae6d538eeff900a34c098761f8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c8859675f1cf92fe2eb25ef525440702140a0b55

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-129Improper Validation of Array Index

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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