01 Record

CVE-2024-40953

KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin()

HighPUBLISHEDCNA: Linux

CNA base score7.9 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

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02 Description

KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin()

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.19% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 9.3% of scored records. A rank, not a probability.

NVD base score

4.7 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-08-04.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2024-07-12 12:31Z2 YR AGO

Last updated

2026-08-05 11:34Z2 MO AGO

Reserved

2024-07-12

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 7.9)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

Weaknesses

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')Class

Data version

5.2

Document digest

5a8c883b49da5ff99a8e16900bb6162542998b29cc3f9d3dda8a4d5f98f91e15

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux217ece6129f2d3b4fdd18d9e79be9e43d8d14a42 to < 11a772d5376aa6d3e2e69b5b5c585f79b60c0e17, 217ece6129f2d3b4fdd18d9e79be9e43d8d14a42 to < 4c141136a28421b78f34969b25a4fa32e06e2180, 217ece6129f2d3b4fdd18d9e79be9e43d8d14a42 to < 71fbc3af3dacb26c3aa2f30bb3ab05c44d082c84, 217ece6129f2d3b4fdd18d9e79be9e43d8d14a42 to < 82bd728a06e55f5b5f93d10ce67f4fe7e689853a, 217ece6129f2d3b4fdd18d9e79be9e43d8d14a42 to < 92c77807d938145c7c3350c944ef9f39d7f6017c, 217ece6129f2d3b4fdd18d9e79be9e43d8d14a42 to < a937ef951bba72f48d2402451419d725d70dba20, 217ece6129f2d3b4fdd18d9e79be9e43d8d14a42 to < 95c8dd79f3a14df96b3820b35b8399bd91b2be60, 217ece6129f2d3b4fdd18d9e79be9e43d8d14a42 to < 49f683b41f28918df3e51ddc0d928cb2e934ccdb, 2.6.39—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/11a772d5376aa6d3e2e69b5b5c585f79b60c0e17
git.kernel.orghttps://git.kernel.org/stable/c/4c141136a28421b78f34969b25a4fa32e06e2180
git.kernel.orghttps://git.kernel.org/stable/c/71fbc3af3dacb26c3aa2f30bb3ab05c44d082c84
git.kernel.orghttps://git.kernel.org/stable/c/82bd728a06e55f5b5f93d10ce67f4fe7e689853a
git.kernel.orghttps://git.kernel.org/stable/c/92c77807d938145c7c3350c944ef9f39d7f6017c
git.kernel.orghttps://git.kernel.org/stable/c/a937ef951bba72f48d2402451419d725d70dba20
git.kernel.orghttps://git.kernel.org/stable/c/95c8dd79f3a14df96b3820b35b8399bd91b2be60
git.kernel.orghttps://git.kernel.org/stable/c/49f683b41f28918df3e51ddc0d928cb2e934ccdb
lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

07 Fixed in

Debian 12

linux
Fixed in 6.1.99-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.9.7-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 6.9.7-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.