CVE-2025-40089
In the Linux kernel, the following vulnerability has been resolved: cxl/features: Add check for no entries in cxl_feature_info cxl EDAC calls cxl_feature_info() to get the feature information and if the hardware has no Features support, cxlfs may be passed in as NULL. [ 51.957498] BUG: kernel NULL pointer dereference, address: 0000000000000008 [ 51.965571] #PF: supervisor read access in kernel mode [ 51.971559] #PF: error_code(0x0000) - not-present page [ 51.977542] PGD 17e4f6067 P4D 0 [ 51.981384] Oops: Oops: 0000 [#1] SMP NOPTI [ 51.986300] CPU: 49 UID: 0 PID: 3782 Comm: systemd-udevd Not tainted 6.17.0dj test+ #64 PREEMPT(voluntary) [ 51.997355] Hardware name: <removed> [ 52.009790] RIP: 0010:cxl_feature_info+0xa/0x80 [cxl_core] Add a check for cxlfs before dereferencing it and return -EOPNOTSUPP if there is no cxlfs created due to no hardware support.
Affected versions
Linux kernel versions
6.15
and later are affected. Fixed in
6.17.5,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40089 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/a375246fcf2bbdaeb1df7fa7ee5a8b884a89085e
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PatchKernel patch commithttps://git.kernel.org/stable/c/b8a69e3b1a460bf5d96dd53cbd121aa2cd346886
Frequently asked questions
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What is CVE-2025-40089?
CVE-2025-40089 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.15 onward and has been patched in 6.17.5 and 6.18. CVE-2025-40089 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40089?
Yes — CVE-2025-40089 has been patched. Fixed versions include 6.17.5 and 6.18. If you are running Linux kernel 6.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40089 actively exploited?
No — CVE-2025-40089 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.