Description

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

rhashtable: Fix potential deadlock by moving schedule_work outside lock

Move the hash table growth check and work scheduling outside the
rht lock to prevent a possible circular locking dependency.

The original implementation could trigger a lockdep warning due to
a potential deadlock scenario involving nested locks between
rhashtable bucket, rq lock, and dsq lock. By relocating the
growth check and work scheduling after releasing the rth lock, we break
this potential deadlock chain.

This change expands the flexibility of rhashtable by removing
restrictive locking that previously limited its use in scheduler
and workqueue contexts.

Import to say that this calls rht_grow_above_75(), which reads from
struct rhashtable without holding the lock, if this is a problem, we can
move the check to the lock, and schedule the workqueue after the lock.

Modified so that atomic_inc is also moved outside of the bucket
lock along with the growth above 75% check.

Classification

CVE ID: CVE-2024-58042

Affected Products

Vendor: Linux, Linux

Product: Linux, Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.01% (probability of being exploited)

EPSS Percentile: 1.28% (scored less or equal to compared to others)

EPSS Date: 2025-03-28 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2024-58042
https://git.kernel.org/stable/c/eb2e58484b838fb4e777ee9721bb9e20e6ca971d
https://git.kernel.org/stable/c/ced8ce3c83a7150c5f5d371a8c332d7bc7f9b66d
https://git.kernel.org/stable/c/e1d3422c95f003eba241c176adfe593c33e8a8f6

Timeline