CVE-2023-54021
In the Linux kernel, the following vulnerability has been resolved: ext4: set goal start correctly in ext4_mb_normalize_request We need to set ac_g_ex to notify the goal start used in ext4_mb_find_by_goal. Set ac_g_ex instead of ac_f_ex in ext4_mb_normalize_request. Besides we should assure goal start is in range [first_data_block, blocks_count) as ext4_mb_initialize_context does. [ Added a check to make sure size is less than ar->pright; otherwise we could end up passing an underflowed value of ar->pright - size to ext4_get_group_no_and_offset(), which will trigger a BUG_ON later on. - TYT ]
Affected versions
Linux kernel versions
2.6.25
and later are affected. Fixed in
4.14.316,
4.19.284,
5.4.244,
5.10.181,
5.15.113,
6.1.30,
6.3.4,
6.4
and their respective stable series.
References
The following references provide additional information about CVE-2023-54021 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/2479bb6cbdb4d56b807bbe5229e3e26a6f1f4530
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PatchKernel patch commithttps://git.kernel.org/stable/c/390eee955d4de4662db5e3e9e9a9eae020432cb7
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PatchKernel patch commithttps://git.kernel.org/stable/c/3ca3005b502ca8ea87d6a344323b179b48c4e4a3
Frequently asked questions
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What is CVE-2023-54021?
CVE-2023-54021 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 2.6.25 onward and has been patched in 4.14.316, 4.19.284, 5.4.244 and others. CVE-2023-54021 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-2023-54021?
Yes — CVE-2023-54021 has been patched. Fixed versions include 4.14.316, 4.19.284, 5.4.244 and others. If you are running Linux kernel 2.6.25 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2023-54021 actively exploited?
No — CVE-2023-54021 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.