CVE-2026-23356

Kernel crash via missing activity-log references

Published Mar 25, 2026 · Updated Mar 25, 2026

Reachable assertion in the Linux kernel's DRBD driver allows local users to crash the system during an active resynchronization. drbd_al_begin_io_nonblock() logs a failed lc_get_cumulative() call but continues without activity-log extent references, and completion releases references the request never held, triggering BUG_ON in lc_put(). Triggering requires local low-privileged access, DRBD activity, and a timing race with lc_try_lock(); the reported consequence is a kernel crash and possible missed resynchronization of in-flight I/O.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in the Linux kernel's DRBD driver allows local users to crash the system during an active resynchronization. drbd_al_begin_io_nonblock() logs a failed lc_get_cumulative() call but continues without activity-log extent references, and completion releases references the request never held, triggering BUG_ON in lc_put(). Triggering requires local low-privileged access, DRBD activity, and a timing race with lc_try_lock(); the reported consequence is a kernel crash and possible missed resynchronization of in-flight I/O.

The record

CVE
CVE-2026-23356
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 <7752569fc78e89794ce28946529850282233f99d
  2. Affected versionversion=08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 <ab140365fb62c0bdab22b2f516aff563b2559e3b
  3. Affected versionversion=08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 <d1ef3aed4df2ef1fe46befd8f2da9a6ec5445508
  4. Affected versionversion=08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 <e91d8d6565b7819d13dab21d4dbed5b45efba59b
  5. Affected versionversion=08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 <eef1390125b660b8b61f9f227a03bb9c5e6d36a5
  6. Affected versionversion=08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 <f558e5404a72054b525dced1a0c66aa95a144153
  7. Affected versionversion=3.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 <7752569fc78e89794ce28946529850282233f99d; version=08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 <ab140365fb62c0bdab22b2f516aff563b2559e3b; version=08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 <d1ef3aed4df2ef1fe46befd8f2da9a6ec5445508; version=08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 <e91d8d6565b7819d13dab21d4dbed5b45efba59b; version=08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 <eef1390125b660b8b61f9f227a03bb9c5e6d36a5; version=08a1ddab6df7d3c7b6341774cb1cf4b21b96a214 <f558e5404a72054b525dced1a0c66aa95a144153; version=3.10

Published CVSS scores

6.3Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

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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