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CVE-2024-50280

Disclosure Date: November 19, 2024 •
CVE-2024-50280
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Description

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

dm cache: fix flushing uninitialized delayed_work on cache_ctr error

An unexpected WARN_ON from flush_work() may occur when cache creation
fails, caused by destroying the uninitialized delayed_work waker in the
error path of cache_create(). For example, the warning appears on the
superblock checksum error.

Reproduce steps:

dmsetup create cmeta —table “0 8192 linear /dev/sdc 0”
dmsetup create cdata —table “0 65536 linear /dev/sdc 8192”
dmsetup create corig —table “0 524288 linear /dev/sdc 262144”
dd if=/dev/urandom of=/dev/mapper/cmeta bs=4k count=1 oflag=direct
dmsetup create cache —table “0 524288 cache /dev/mapper/cmeta
/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0”

Kernel logs:

(snip)
WARNING: CPU: 0 PID: 84 at kernel/workqueue.c:4178 __flush_work+0x5d4/0x890

Fix by pulling out the cancel_delayed_work_sync() from the constructor’s
error path. This patch doesn’t affect the use-after-free fix for
concurrent dm_resume and dm_destroy (commit 6a459d8edbdb (“dm cache: Fix
UAF in destroy()”)) as cache_dtr is not changed.

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CVSS V3 Severity and Metrics
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General Information

Offensive Application
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Utility Class
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OS
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Vulnerable Versions
Linux 5a754d3c7712
Linux 8cc12dab6353
Linux not down converted
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Discovered By
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Metasploit Module
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Vendors

  • Linux

Products

  • Linux
Technical Analysis