7.5

CVE-2023-54227

blk-mq: fix tags leak when shrink nr_hw_queues

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e
Version < 26d495f0f64d8cd4fcd29206ee5c653ee0e0cbcd
Status affected
Version a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e
Version < c0ef7493e68b8896806a2f598fcffbaa97333405
Status affected
Version a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e
Version < e1dd7bc93029024af5688253b0c05181d6e01f8e
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 5.16
Status affected
Version 0
Version < 5.16
Status unaffected
Version <= 6.1.*
Version 6.1.189
Status unaffected
Version <= 6.5.*
Version 6.5.5
Status unaffected
Version <= *
Version 6.6
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.37% 0.296
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Es wurden noch keine Informationen zu CWE veröffentlicht.
https://git.kernel.org/stable/c/c0ef7493e68b8896806a2f598fcffbaa97333405
https://git.kernel.org/stable/c/e1dd7bc93029024af5688253b0c05181d6e01f8e
https://git.kernel.org/stable/c/26d495f0f64d8cd4fcd29206ee5c653ee0e0cbcd