CVE-2023-54227
In the Linux kernel, the following vulnerability has been resolved: blk-mq: fix tags leak when shrink nr_hw_queues Although we don't need to realloc set->tags[] when shrink nr_hw_queues, we need to free them. Or these tags will be leaked. How to reproduce: 1. mount -t configfs configfs /mnt 2. modprobe null_blk nr_devices=0 submit_queues=8 3. mkdir /mnt/nullb/nullb0 4. echo 1 > /mnt/nullb/nullb0/power 5. echo 4 > /mnt/nullb/nullb0/submit_queues 6. rmdir /mnt/nullb/nullb0 In step 4, will alloc 9 tags (8 submit queues and 1 poll queue), then in step 5, new_nr_hw_queues = 5 (4 submit queues and 1 poll queue). At last in step 6, only these 5 tags are freed, the other 4 tags leaked.
Affected versions
Linux kernel versions
5.16
and later are affected. Fixed in
6.5.5,
6.6
and their respective stable series.
References
The following references provide additional information about CVE-2023-54227 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/c0ef7493e68b8896806a2f598fcffbaa97333405
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PatchKernel patch commithttps://git.kernel.org/stable/c/e1dd7bc93029024af5688253b0c05181d6e01f8e
Frequently asked questions
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What is CVE-2023-54227?
CVE-2023-54227 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.16 onward and has been patched in 6.5.5 and 6.6. CVE-2023-54227 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-2023-54227?
Yes — CVE-2023-54227 has been patched. Fixed versions include 6.5.5 and 6.6. If you are running Linux kernel 5.16 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2023-54227 actively exploited?
No — CVE-2023-54227 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.