CVE-2026-45876
In the Linux kernel, the following vulnerability has been resolved: arm64/gcs: Fix error handling in arch_set_shadow_stack_status() alloc_gcs() returns an error-encoded pointer on failure, which comes from do_mmap(), not NULL. The current NULL check fails to detect errors, which could lead to using an invalid GCS address. Use IS_ERR_VALUE() to properly detect errors, consistent with the check in gcs_alloc_thread_stack().
Affected versions
Linux kernel versions
6.13
and later are affected. Fixed in
6.18.14,
6.19.4,
7.0
and their respective stable series.
References
The following references provide additional information about CVE-2026-45876 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/53c998527ffa60f9deda8974a11ad39790684159
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PatchKernel patch commithttps://git.kernel.org/stable/c/a4741114c9622346c4bbb8cc2bbd88153616ffaf
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PatchKernel patch commithttps://git.kernel.org/stable/c/c787a235deb33be6eda40beee8f561da5fd8cb8c
Frequently asked questions
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What is CVE-2026-45876?
CVE-2026-45876 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.13 onward and has been patched in 6.18.14, 6.19.4 and 7.0. CVE-2026-45876 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-2026-45876?
Yes — CVE-2026-45876 has been patched. Fixed versions include 6.18.14, 6.19.4 and 7.0. If you are running Linux kernel 6.13 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-45876 actively exploited?
No — CVE-2026-45876 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.