CVE-2026-23002
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2026-01-25

Last updated on: 2026-03-25

Assigner: kernel.org

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.
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Meta Information
Published
2026-01-25
Last Modified
2026-03-25
Generated
2026-05-27
AI Q&A
2026-01-25
EPSS Evaluated
2026-05-25
NVD
CVE-2026-23002
EUVD
EUVD-2026-4620
Affected Vendors & Products
Showing 11 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.12
linux linux_kernel From 6.13 (inc) to 6.18.7 (exc)
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel From 6.12.1 (inc) to 6.12.67 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability in the Linux kernel involves improper handling of file reading in a sleepable context. Specifically, the code was using direct page cache access via read_cache_folio(), which could lead to a kernel NULL pointer dereference bug in filemap_read_folio. The fix changes the code to use __kernel_read() for sleepable contexts, which is a safer, standard kernel file reading interface that handles the complexity of reading file data and prevents the crash.


How can this vulnerability impact me? :

This vulnerability could cause the Linux kernel to crash due to a NULL pointer dereference when reading files in certain contexts. Such a crash can lead to system instability or denial of service, affecting the reliability and availability of the system.


What immediate steps should I take to mitigate this vulnerability?

Apply the patch that updates the Linux kernel to use __kernel_read() for sleepable contexts in lib/buildid, which prevents the kernel NULL pointer dereference in filemap_read_folio. This involves updating your kernel to a version that includes this fix.


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