CVE-2024-56706

s390/cpum_sf: Fix and protect memory allocation of SDBs with mutex

Description

In the Linux kernel, the following vulnerability has been resolved: s390/cpum_sf: Fix and protect memory allocation of SDBs with mutex Reservation of the PMU hardware is done at first event creation and is protected by a pair of mutex_lock() and mutex_unlock(). After reservation of the PMU hardware the memory required for the PMUs the event is to be installed on is allocated by allocate_buffers() and alloc_sampling_buffer(). This done outside of the mutex protection. Without mutex protection two or more concurrent invocations of perf_event_init() may run in parallel. This can lead to allocation of Sample Data Blocks (SDBs) multiple times for the same PMU. Prevent this and protect memory allocation of SDBs by mutex.

N/A

CVSS

Severity:

EPSS 0.01%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/4b3bdfa89635db6a53e02955548bd07bebcae233
https://git.kernel.org/stable/c/f55bd479d8663a4a4e403b3d308d3d1aa33d92df

Frequently Asked Questions

What is the severity of CVE-2024-56706?: CVE-2024-56706 has not yet been assigned a CVSS score.
How to fix CVE-2024-56706?: To fix CVE-2024-56706, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-56706 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-56706 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-56706?: CVE-2024-56706 affects Linux Linux, Linux Linux.

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