CVE-2026-63822

Kernel warning via transmit-status buffer double free

Published Jul 19, 2026 · Updated Jul 19, 2026

Double free in the Linux kernel ath11k driver from 5.6 allows attackers to trigger a warning during device removal after initialization failure. The ath11k_dp_alloc error path frees every transmit-ring tx_status buffer without clearing the pointer, so ath11k_dp_free frees the buffer again during teardown. Failed ath11k firmware initialization is required; a VM with failed MSI address initialization reproduces the warning during unbinding.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in the Linux kernel ath11k driver from 5.6 allows attackers to trigger a warning during device removal after initialization failure. The ath11k_dp_alloc error path frees every transmit-ring tx_status buffer without clearing the pointer, so ath11k_dp_free frees the buffer again during teardown. Failed ath11k firmware initialization is required; a VM with failed MSI address initialization reproduces the warning during unbinding.

The record

CVE
CVE-2026-63822
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=5.6
  2. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <051f954b94479d72222c9fbc82a3eef4777bca01
  3. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <0a946abb82f29abe9a15173b707a449cb039b43e
  4. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <0aa097a370277deab5337030b9e2d395742f469c
  5. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <318703b6f71d1a29ee0ac46c32a38f7734d4cfb2
  6. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <40aa3c2b0cb8e34e0576fc94cc70e4e33db03c0a
  7. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <7b2e62b9080bf4a5f4e70cfe47156df8d93a4f13
  8. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <8b7a26b6681922a38cd5a7829ace61f8e54df9b7
  9. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <e569a5cb401a267168621aa9a1e7f07fcc9612c3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.6; version=d5c65159f2895379e11ca13f62feabe93278985d <051f954b94479d72222c9fbc82a3eef4777bca01; version=d5c65159f2895379e11ca13f62feabe93278985d <0a946abb82f29abe9a15173b707a449cb039b43e; version=d5c65159f2895379e11ca13f62feabe93278985d <0aa097a370277deab5337030b9e2d395742f469c; version=d5c65159f2895379e11ca13f62feabe93278985d <318703b6f71d1a29ee0ac46c32a38f7734d4cfb2; version=d5c65159f2895379e11ca13f62feabe93278985d <40aa3c2b0cb8e34e0576fc94cc70e4e33db03c0a; version=d5c65159f2895379e11ca13f62feabe93278985d <7b2e62b9080bf4a5f4e70cfe47156df8d93a4f13; version=d5c65159f2895379e11ca13f62feabe93278985d <8b7a26b6681922a38cd5a7829ace61f8e54df9b7; version=d5c65159f2895379e11ca13f62feabe93278985d <e569a5cb401a267168621aa9a1e7f07fcc9612c3

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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