CVE-2024-57849

HIGH EPSS 10.5%
Published Jan 11, 20251y ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
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Published Jan 11, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: s390/cpum_sf: Handle CPU hotplug remove during sampling CPU hotplug remove handling triggers the following function call sequence: CPUHP_AP_PERF_S390_SF_ONLINE --> s390_pmu_sf_offline_cpu() ... CPUHP_AP_PERF_ONLINE --> perf_event_exit_cpu() The s390 CPUMF sampling CPU hotplug handler invokes: s390_pmu_sf_offline_cpu() +--> cpusf_pmu_setup() +--> setup_pmc_cpu() +--> deallocate_buffers() This function de-allocates all sampling data buffers (SDBs) allocated for that CPU at event initialization. It also clears the PMU_F_RESERVED bit. The CPU is gone and can not be sampled. With the event still being active on the removed CPU, the CPU event hotplug support in kernel performance subsystem triggers the following function calls on the removed CPU: perf_event_exit_cpu() +--> perf_event_exit_cpu_context() +--> __perf_event_exit_context() +--> __perf_remove_from_context() +--> event_sched_out() +--> cpumsf_pmu_del() +--> cpumsf_pmu_stop() +--> hw_perf_event_update() to stop and remove the event. During removal of the event, the sampling device driver tries to read out the remaining samples from the sample data buffers (SDBs). But they have already been freed (and may have been re-assigned). This may lead to a use after free situation in which case the samples are most likely invalid. In the best case the memory has not been reassigned and still contains valid data. Remedy this situation and check if the CPU is still in reserved state (bit PMU_F_RESERVED set). In this case the SDBs have not been released an contain valid data. This is always the case when the event is removed (and no CPU hotplug off occured). If the PMU_F_RESERVED bit is not set, the SDB buffers are gone.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
10.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel* <5.4.287
linuxlinux_kernel*≥5.5  –  <5.10.231
linuxlinux_kernel*≥5.11  –  <5.15.174
linuxlinux_kernel*≥5.16  –  <6.1.120
linuxlinux_kernel*≥6.2  –  <6.6.66
linuxlinux_kernel*≥6.7  –  <6.12.5

References 8

  • git.kernel.org https://git.kernel.org/stable/c/06a92f810df8037ca36157282ddcbefdcaf049b8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/238e3af849dfdcb1faed544349f7025e533f9aab
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/99192c735ed4bfdff0d215ec85c8a87a677cb898
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a0bd7dacbd51c632b8e2c0500b479af564afadf3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a69752f1e5de817941a2ea0609254f6f25acd274
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b5be6a0bb639d165c8418d8dddd8f322587be8be
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/be54e6e0f93a39a9c00478d70d12956a5f3d5b9b
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/06a92f810df8037ca36157282ddcbefdcaf049b8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/238e3af849dfdcb1faed544349f7025e533f9aab
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/99192c735ed4bfdff0d215ec85c8a87a677cb898
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a0bd7dacbd51c632b8e2c0500b479af564afadf3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a69752f1e5de817941a2ea0609254f6f25acd274
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b5be6a0bb639d165c8418d8dddd8f322587be8be
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/be54e6e0f93a39a9c00478d70d12956a5f3d5b9b
    Patch