CVE-2022-49406

published 2025-02-26

CVE-2022-49406: In the Linux kernel, the following vulnerability has been resolved: block: Fix potential deadlock in blk_ia_range_sysfs_show() When being read, a sysfs…

Priority P4 19 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

block: Fix potential deadlock in blk_ia_range_sysfs_show()

When being read, a sysfs attribute is already protected against removal
with the kobject node active reference counter. As a result, in
blk_ia_range_sysfs_show(), there is no need to take the queue sysfs
lock when reading the value of a range attribute. Using the queue sysfs
lock in this function creates a potential deadlock situation with the
disk removal, something that a lockdep signals with a splat when the
device is removed:

[ 760.703551] Possible unsafe locking scenario:
[ 760.703551]
[ 760.703554] CPU0 CPU1
[ 760.703556] ---- ----
[ 760.703558] lock(&q->sysfs_lock);
[ 760.703565] lock(kn->active#385);
[ 760.703573] lock(&q->sysfs_lock);
[ 760.703579] lock(kn->active#385);
[ 760.703587]
[ 760.703587] *** DEADLOCK ***

Solve this by removing the mutex_lock()/mutex_unlock() calls from
blk_ia_range_sysfs_show().

Affected

10 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.18.5-1 (bookworm)	linux 5.18.5-1 (bookworm)
linux	linux	—	—
linux	linux	>= a2247f19ee1c5ad75ef095cdfb909a3244b88aa8 < dc107c805cde709866b59867ef72b9390199205e	dc107c805cde709866b59867ef72b9390199205e
linux	linux	>= a2247f19ee1c5ad75ef095cdfb909a3244b88aa8 < 717b078bc745ba9a262abebed9806a17e8bbb77b	717b078bc745ba9a262abebed9806a17e8bbb77b
linux	linux	>= a2247f19ee1c5ad75ef095cdfb909a3244b88aa8 < 41e46b3c2aa24f755b2ae9ec4ce931ba5f0d8532	41e46b3c2aa24f755b2ae9ec4ce931ba5f0d8532
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 5.16 < 5.17.14	5.17.14
linux	linux_kernel	>= 5.18 < 5.18.3	5.18.3

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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CWE-667