CVE-2026-23002

MEDIUM EPSS 4.6%
Published Jan 25, 20265mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jan 25, 2026 5mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: lib/buildid: use __kernel_read() for sleepable context Prevent a "BUG: unable to handle kernel NULL pointer dereference in filemap_read_folio". For the sleepable context, convert freader to use __kernel_read() instead of direct page cache access via read_cache_folio(). This simplifies the faultable code path by using the standard kernel file reading interface which handles all the complexity of reading file data. At the moment we are not changing the code for non-sleepable context which uses filemap_get_folio() and only succeeds if the target folios are already in memory and up-to-date. The reason is to keep the patch simple and easier to backport to stable kernels. Syzbot repro does not crash the kernel anymore and the selftests run successfully. In the follow up we will make __kernel_read() with IOCB_NOWAIT work for non-sleepable contexts. In addition, I would like to replace the secretmem check with a more generic approach and will add fstest for the buildid code.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
4.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥6.12.1  –  <6.12.67
linuxlinux_kernel*≥6.13  –  <6.18.7
linuxlinux_kernel6.12any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any

References 3

  • git.kernel.org https://git.kernel.org/stable/c/568aeb3476c770a3863c755dd2a199c212434286
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/777a8560fd29738350c5094d4166fe5499452409
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b11dfb7708f212b96c7973a474014c071aa02e05
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/568aeb3476c770a3863c755dd2a199c212434286
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/777a8560fd29738350c5094d4166fe5499452409
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b11dfb7708f212b96c7973a474014c071aa02e05
    Patch