Riskcovery

CVE-2024-56706

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

State
Published
Severity
7.8 High
Published
Dec 28, 2024
Updated
Aug 5, 2026
Reserved
Dec 27, 2024

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 8a6fe8f21ec4f049a7b1fe120ad50a5065a9c7a8 to before 4b3bdfa89635db6a53e02955548bd07bebcae233Affected
  • 8a6fe8f21ec4f049a7b1fe120ad50a5065a9c7a8 to before f55bd479d8663a4a4e403b3d308d3d1aa33d92dfAffected
LinuxLinux
  • 6.12Affected
  • before 6.12Not affected
  • 6.12.2 through 6.12.*Not affected
  • 6.13 and laterNot affected

References

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