CVE-2026-74426

Kernel crash via dynamic-root trace dereference

Published Aug 15, 2026 · Updated Aug 15, 2026

NULL pointer dereference in the Linux kernel AFS implementation from 5.2 allows local users to crash the kernel through an AFS mount. When a dynamic-root mount leaves the allocated AFS superblock cell and volume pointers unset, trace_afs_get_tree dereferences both pointers in fs/afs/super.c. Triggering the fault requires local mount permission and reaches an availability-only kernel crash, without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

NULL pointer dereference in the Linux kernel AFS implementation from 5.2 allows local users to crash the kernel through an AFS mount. When a dynamic-root mount leaves the allocated AFS superblock cell and volume pointers unset, trace_afs_get_tree dereferences both pointers in fs/afs/super.c. Triggering the fault requires local mount permission and reaches an availability-only kernel crash, without reported data disclosure or modification.

The record

CVE
CVE-2026-74426
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.2
  2. Affected versionversion=80548b03991f58758a336424a90bf9f988e3b077 <0b70716081c6462be9b2928ad736d0d527b09678
  3. Affected versionversion=80548b03991f58758a336424a90bf9f988e3b077 <23b3d457d8387bcb2a61063a9e520063ada9335f
  4. Affected versionversion=80548b03991f58758a336424a90bf9f988e3b077 <67fb48c4a0874953212321cd5d57fdb4900dbc31
  5. Affected versionversion=80548b03991f58758a336424a90bf9f988e3b077 <70b2842734d831c908474779bb8a76daf55f782c
  6. Affected versionversion=80548b03991f58758a336424a90bf9f988e3b077 <867b3ea146a041023bfcd258e6db516b1bb28f19
  7. Affected versionversion=80548b03991f58758a336424a90bf9f988e3b077 <d5b17474feed3c30991f07affa2473adbad95055
  8. Affected versionversion=80548b03991f58758a336424a90bf9f988e3b077 <d648cc2069eb081707c061849046d909f57c78b1
  9. Affected versionversion=80548b03991f58758a336424a90bf9f988e3b077 <ea19edf71721cd42f923e3c70f4ff995b422fe3b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.2; version=80548b03991f58758a336424a90bf9f988e3b077 <0b70716081c6462be9b2928ad736d0d527b09678; version=80548b03991f58758a336424a90bf9f988e3b077 <23b3d457d8387bcb2a61063a9e520063ada9335f; version=80548b03991f58758a336424a90bf9f988e3b077 <67fb48c4a0874953212321cd5d57fdb4900dbc31; version=80548b03991f58758a336424a90bf9f988e3b077 <70b2842734d831c908474779bb8a76daf55f782c; version=80548b03991f58758a336424a90bf9f988e3b077 <867b3ea146a041023bfcd258e6db516b1bb28f19; version=80548b03991f58758a336424a90bf9f988e3b077 <d5b17474feed3c30991f07affa2473adbad95055; version=80548b03991f58758a336424a90bf9f988e3b077 <d648cc2069eb081707c061849046d909f57c78b1; version=80548b03991f58758a336424a90bf9f988e3b077 <ea19edf71721cd42f923e3c70f4ff995b422fe3b

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo