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🛡️ CVE-2024-57849 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

s390/cpum_sf: Handle CPU hotplug remove during sampling

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2024-57849 is recorded against 2 packages.

  • kernel (from 6.7.0 up to 6.12.5)
  • linux-kernel (from 6.7 up to 6.12.5)

Timeline and source

Published on 11 January 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
lists.debian.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2024-57849 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-01-11
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.7.0 6.12.5
linux-kernel 6.7 6.12.5

References

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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