CVE-2024-35791 json
KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()
published 2024-05-17 2 y ago modified 2026-08-05 3 mo ago also EUVD-2024-35784
- cvss
- 7.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 14%
- public exploits
- 0
- none known
Summary
In the Linux kernel, the following vulnerability has been resolved:
KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()
Do the cache flush of converted pages in svm_register_enc_region() before dropping kvm->lock to fix use-after-free issues where region and/or its array of pages could be freed by a different task, e.g. if userspace has __unregister_enc_region_locked() already queued up for the region.
Note, the "obvious" alternative of using local variables doesn't fully resolve the bug, as region->pages is also dynamically allocated. I.e. the region structure itself would be fine, but region->pages could be freed.
Flushing multiple pages under kvm->lock is unfortunate, but the entire flow is a rare slow path, and the manual flush is only needed on CPUs that lack coherency for encrypted memory.
Patch / fix
- Linux Linux 4.20, 5.5, 5.10.215, 5.15.154, 6.1.84, 6.6.24, 6.7.12, 6.8
- linux Debian 12 6.1.85-1
- linux Debian 14, Debian 13 6.7.12-1
debian advisories DEBIAN-CVE-2024-35791
- linux Ubuntu 22.04 LTS 5.15.0-116.126
- linux-aws Ubuntu 22.04 LTS 5.15.0-1065.71
- linux-gcp Ubuntu 22.04 LTS 5.15.0-1064.72
- linux-gke Ubuntu 22.04 LTS 5.15.0-1062.68
- linux-ibm Ubuntu 22.04 LTS 5.15.0-1058.61
- linux-kvm Ubuntu 22.04 LTS 5.15.0-1062.67
- linux-azure Ubuntu 22.04 LTS 5.15.0-1068.77
- linux-gkeop Ubuntu 22.04 LTS 5.15.0-1048.55
ubuntu advisories UBUNTU-CVE-2024-35791
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- kernel RHEL 9 5.14.0-427.35.1.el9_4
- rv RHEL 9 5.14.0-427.35.1.el9_4
- perf RHEL 9 5.14.0-427.35.1.el9_4
- rtla RHEL 9 5.14.0-427.35.1.el9_4
- bpftool RHEL 9 7.3.0-427.35.1.el9_4
- libperf RHEL 9 5.14.0-427.35.1.el9_4
- kernel-rt RHEL 9 5.14.0-427.35.1.el9_4
- kernel-64k RHEL 9 5.14.0-427.35.1.el9_4
red hat advisories RHSA-2024:6567RHSA-2024:4823RHSA-2024:4831
- kernel-rt Linux Micro 6.0 6.4.0-9.1
- kernel-source-rt Linux Micro 6.0 6.4.0-9.1
- kernel-source Linux Micro 6.0 6.4.0-18.1
- kernel-default Linux Micro 6.0 6.4.0-18.1
- kernel-kvmsmall Linux Micro 6.0 6.4.0-18.1
- kernel-default-base Linux Micro 6.0 6.4.0-17.1.1.51
- kernel-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.5.1
- kernel-syms-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.5.1
suse advisories SUSE-SU-2025:20028-1SUSE-SU-2025:20008-1SUSE-SU-2024:2973-1SUSE-SU-2024:2203-1SUSE-SU-2024:2190-1SUSE-SU-2024:2184-1
- kernel AlmaLinux 9 5.14.0-427.35.1.el9_4
- rv AlmaLinux 9 5.14.0-427.35.1.el9_4
- perf AlmaLinux 9 5.14.0-427.35.1.el9_4
- rtla AlmaLinux 9 5.14.0-427.35.1.el9_4
- bpftool AlmaLinux 9 7.3.0-427.35.1.el9_4
- libperf AlmaLinux 9 5.14.0-427.35.1.el9_4
- kernel-rt AlmaLinux 9 5.14.0-427.35.1.el9_4
- kernel-64k AlmaLinux 9 5.14.0-427.35.1.el9_4
almalinux advisories ALSA-2024:6567
- kernel Rocky Linux 9 5.14.0-427.35.1.el9_4.cloud.1.0
- kernel Rocky Linux 9 5.14.0-427.35.1.el9_4
rocky linux advisories RXSA-2024:6567RLSA-2024:6567
- git.kernel.org/stable/c/2d13b79640b147bd77c34a5998533b2021a4122d commit
- git.kernel.org/stable/c/e126b508ed2e616d679d85fca2fbe77bb48bbdd7 commit
- git.kernel.org/stable/c/4868c0ecdb6cfde7c70cf478c46e06bb9c7e5865 commit
- git.kernel.org/stable/c/12f8e32a5a389a5d58afc67728c76e61beee1ad4 commit
- git.kernel.org/stable/c/f6d53d8a2617dd58c89171a6b9610c470ebda38a commit
- git.kernel.org/stable/c/5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807 commit
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2024-35791 updated cvss 5.5
kernel: KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()
-
Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 moreaffected: no fix planned “Will not fix”
-
Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 moreaffected: no fix available
-
Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.75.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.75.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.75.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.75.1.el9_2fixed: vendor fix RHSA-2024:4823
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Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.35.1.el9_4, perf 5.14.0-427.35.1.el9_4, rtla 5.14.0-427.35.1.el9_4, kernel-devel-matched 5.14.0-427.35.1.el9_4, kernel-64k-devel-matched 5.14.0-427.35.1.el9_4, kernel-debug-devel-matched 5.14.0-427.35.1.el9_4, +6 morefixed: vendor fix RHSA-2024:6567
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Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.75.1.el9_2, rtla 5.14.0-284.75.1.el9_2, kernel-devel-matched 5.14.0-284.75.1.el9_2, kernel-64k-devel-matched 5.14.0-284.75.1.el9_2, kernel-debug-devel-matched 5.14.0-284.75.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.75.1.el9_2, +5 morefixed: vendor fix RHSA-2024:4823
-
Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.35.1.el9_4, kernel 5.14.0-427.35.1.el9_4, kernel-64k 5.14.0-427.35.1.el9_4, kernel-core 5.14.0-427.35.1.el9_4, kernel-tools 5.14.0-427.35.1.el9_4, python3-perf 5.14.0-427.35.1.el9_4, +28 morefixed: vendor fix RHSA-2024:6567
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Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.75.1.el9_2, kernel 5.14.0-284.75.1.el9_2, kernel-64k 5.14.0-284.75.1.el9_2, kernel-core 5.14.0-284.75.1.el9_2, kernel-tools 5.14.0-284.75.1.el9_2, python3-perf 5.14.0-284.75.1.el9_2, +28 morefixed: vendor fix RHSA-2024:4823
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Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.35.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.35.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.35.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.35.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.35.1.el9_4 Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.35.1.el9_4, kernel-rt-kvm 5.14.0-427.35.1.el9_4, kernel-rt-core 5.14.0-427.35.1.el9_4, kernel-rt-modules 5.14.0-427.35.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.35.1.el9_4, kernel-rt-debug-core 5.14.0-427.35.1.el9_4, +6 morefixed: vendor fix RHSA-2024:6567
show 3 moreshow fewer
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Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-core 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-modules 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-core 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-modules-core 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-modules 5.14.0-284.75.1.rt14.360.el9_2, +4 more Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-kvm 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-core 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-modules 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-kvm 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-core 5.14.0-284.75.1.rt14.360.el9_2, +6 morefixed: vendor fix RHSA-2024:4831
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Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.35.1.el9_4, kernel-rt-core 5.14.0-427.35.1.el9_4, kernel-rt-modules 5.14.0-427.35.1.el9_4, kernel-rt-debug-core 5.14.0-427.35.1.el9_4, kernel-rt-modules-core 5.14.0-427.35.1.el9_4, kernel-rt-debug-modules 5.14.0-427.35.1.el9_4, +4 morefixed: vendor fix RHSA-2024:6567
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Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-doc 5.14.0-284.75.1.el9_2not affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 y ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Linux Linux
Classification
- Weakness
-
- CWE-416 Use After Free
- Technology feeds
References
-
git.kernel.org
/stable/c/2d13b79640b147bd77c34a5998533b2021a4122d
patch
-
git.kernel.org
/stable/c/e126b508ed2e616d679d85fca2fbe77bb48bbdd7
patch
-
git.kernel.org
/stable/c/4868c0ecdb6cfde7c70cf478c46e06bb9c7e5865
patch
-
git.kernel.org
/stable/c/12f8e32a5a389a5d58afc67728c76e61beee1ad4
patch
-
git.kernel.org
/stable/c/f6d53d8a2617dd58c89171a6b9610c470ebda38a
patch
-
git.kernel.org
/stable/c/5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807
patch
-
lists.debian.org
/debian-lts-announce/2024/06/msg00017.html
third-party-advisory
Sources
- CVE List CVE-2024-35791
- NVD CVE-2024-35791
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.