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NVD / CVE Program· CNA Linux

CVE-2024-35791: KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 12f8e32a5a389a5d58afc67728c76e61beee1ad4, 2d13b79640b147bd77c34a5998533b2021a4122d, 4.20.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 12f8e32a5a389a5d58afc67728c76e61beee1ad4, 2d13b79640b147bd77c34a5998533b2021a4122d, 4.20 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 17, 2024
Updated
Aug 5, 2026
EPSS
0.2% · 14th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.8
CNA · Linux
7.8
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • linux linux kernel5.4.98 and later · before 5.5
  • linux linux kernel5.10.15 and later · before 5.10.215
  • linux linux kernel5.11.1 and later · before 5.15.154
  • linux linux kernel5.16 and later · before 6.1.84
  • linux linux kernel4.19.176 and later · before 4.20
  • linux linux kernel6.7 and later · before 6.7.12
  • linux linux kernel6.2 and later · before 6.6.24
  • linux linux kernel5.11
  • linux linux kernel6.8

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • f1ecde00ce1694597f923f0d25f7a797c5243d99, 848bcb0a1d96f67d075465667d3a1ad4af56311e, 5.11affected
    • 4f627ecde7329e476a077bb0590db8f27bb8f912 and later · before 2d13b79640b147bd77c34a5998533b2021a4122daffected · git
    • 19a23da53932bc8011220bd8c410cb76012de004 and later · before e126b508ed2e616d679d85fca2fbe77bb48bbdd7affected · git
    • 19a23da53932bc8011220bd8c410cb76012de004 and later · before 4868c0ecdb6cfde7c70cf478c46e06bb9c7e5865affected · git
    • 19a23da53932bc8011220bd8c410cb76012de004 and later · before 12f8e32a5a389a5d58afc67728c76e61beee1ad4affected · git
    • 19a23da53932bc8011220bd8c410cb76012de004 and later · before f6d53d8a2617dd58c89171a6b9610c470ebda38aaffected · git
    • 19a23da53932bc8011220bd8c410cb76012de004 and later · before 5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807affected · git
    • 5.10.15 and later · before 5.10.215affected · semver
    • 4.19.176 and later · before 4.20affected · semver
    • 5.4.98 and later · before 5.5affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:9bpftoolbefore 7.3.0-427.35.1.el9_47.3.0-427.35.1.el9_4
AlmaLinux:9kernelbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64kbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64k-corebefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64k-debugbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64k-develbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-corebefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-cross-headersbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-debugbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-debug-corebefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-debug-develbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4
AlmaLinux:9kernel-debug-modulesbefore 5.14.0-427.35.1.el9_45.14.0-427.35.1.el9_4

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-35787May 17, 2024 · md/md-bitmap: fix incorrect usage for sb_index
    22Monitor
  • ← EarlierCVE-2024-35790May 17, 2024 · usb: typec: altmodes/displayport: create sysfs nodes as driver's default device attribute group
    22Monitor
  • Later →CVE-2024-35792May 17, 2024 · crypto: rk3288 - Fix use after free in unprepare
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux12f8e32a5a389a5d58afc67728c76e61beee1ad4Vendor (CNA)
Linux Linux2d13b79640b147bd77c34a5998533b2021a4122dVendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux4868c0ecdb6cfde7c70cf478c46e06bb9c7e5865Vendor (CNA)
Linux Linux5.10.215Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807Vendor (CNA)
Linux Linuxe126b508ed2e616d679d85fca2fbe77bb48bbdd7Vendor (CNA)
Linux Linuxf6d53d8a2617dd58c89171a6b9610c470ebda38aVendor (CNA)
almalinux:bpftool7.3.0-427.35.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel5.14.0-427.35.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-427.35.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-427.35.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-427.35.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-427.35.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-427.35.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-427.35.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-427.35.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-427.35.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-427.35.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-427.35.1.el9_4 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.85-1 · Debian:12Package registry (OSV)
red hat:bpftool-debuginfo0:7.3.0-427.35.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-427.35.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-427.35.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-427.35.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-427.35.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-427.35.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-427.35.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-427.35.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

+5

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
free(dev->buf);/* ... another thread is still running ... */process(dev->buf);

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records