🛡️ CVE-2024-35791 — debian-linux

🟠 CVSS 7.8 — High ✅ No Known Exploit CWE-416 NVD

7.8

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()

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.

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.

Weakness class

CVE-2024-35791 is classified as CWE-416: Use After Free. Memory is used after being released, so its contents may already belong to something else.

Affected software

CVE-2024-35791 is recorded against 3 packages.

debian-linux
kernel (from 6.2.0 up to 6.7.12)
linux-kernel

Timeline and source

Published on 17 May 2024 and last revised on 4 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
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
lists.debian.org

CVE-2024-35791 on other distributions

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

BellSoft Debian Ubuntu

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 CWE-416

Public Exploit ✅ No

Source NVD

Published 2024-05-17

Updated 2026-08-12

Modified 2026-08-04

Fix URL https://git.kernel.org/stable/c/12f8e32a5a389a5d58afc67728c76e61beee1ad4

Affected Packages

Software	From version	Fixed in
debian-linux	—	—
kernel	6.2.0	6.7.12
linux-kernel	—	—

References

Patch https://git.kernel.org/stable/c/12f8e32a5a389a5d58afc67728c76e61beee1ad4

Patch https://git.kernel.org/stable/c/2d13b79640b147bd77c34a5998533b2021a4122d

Patch https://git.kernel.org/stable/c/4868c0ecdb6cfde7c70cf478c46e06bb9c7e5865

Patch https://git.kernel.org/stable/c/5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807

Patch https://git.kernel.org/stable/c/e126b508ed2e616d679d85fca2fbe77bb48bbdd7

Patch https://git.kernel.org/stable/c/f6d53d8a2617dd58c89171a6b9610c470ebda38a

Patch https://git.kernel.org/stable/c/12f8e32a5a389a5d58afc67728c76e61beee1ad4

Patch https://git.kernel.org/stable/c/2d13b79640b147bd77c34a5998533b2021a4122d

Patch https://git.kernel.org/stable/c/4868c0ecdb6cfde7c70cf478c46e06bb9c7e5865

Patch https://git.kernel.org/stable/c/5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807

Patch https://git.kernel.org/stable/c/e126b508ed2e616d679d85fca2fbe77bb48bbdd7

Patch https://git.kernel.org/stable/c/f6d53d8a2617dd58c89171a6b9610c470ebda38a

Third Party Advisory https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html

🔗 NVD 🔗 Mitre ✅ Fix / Advisory

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