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NVD / CVE Program· CNA Linux

CVE-2026-74512: audit: fix potential use-after-free in audit_del_rule()

HighCVSS 7.8 · v3.1—No exploit Fix available

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: 0.12% (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 246df90b5f1a8a6e6abbd2f058b029558720adec, 3f82927b399d7a276c0c12b6ff4424b747a0c9a7, 45bf3df5b32e5a49953e7ceabc55f7dd85380e46; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 246df90b5f1a8a6e6abbd2f058b029558720adec, 3f82927b399d7a276c0c12b6ff4424b747a0c9a7, 45bf3df5b32e5a49953e7ceabc55f7dd85380e46; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1 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: audit: fix potential use-after-free in audit_del_rule() `audit_del_rule()` destroys `e->rule.exe` via `audit_remove_mark_rule()` before unlinking the rule from RCU-visible filter lists and waiting for a grace period. Concurrent readers in `audit_filter()` and `audit_filter_rules()` still dereference `e->rule.exe`, while the fsnotify mark can be freed on an independent lifetime path. This creates a use-after-free window during rule deletion. Fix this by unlinking the rule from the RCU-visible lists and invoking `synchronize_rcu()` before calling `audit_remove_mark_rule()` (and other rule removal helpers). This ensures that all existing RCU readers have exited the critical section before any underlying resources are destroyed.

Published
Aug 15, 2026
Updated
Oct 16, 2026
EPSS
0.1% · 2th percentile
CWE
—

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 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-74512

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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.

—

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

    • 4.3affected
    • 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and later · before 93616c567469510b7bba55b2674e0c4523fd7e64affected · git
    • 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and later · before 3f82927b399d7a276c0c12b6ff4424b747a0c9a7affected · git
    • 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and later · before 8ae135a8962be9d4e8a131eb18eb06cdf02a47ceaffected · git
    • 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and later · before 45bf3df5b32e5a49953e7ceabc55f7dd85380e46affected · git
    • 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and later · before 78bde7e9bd36eaae1b8e8cfcd47f12a34f301dbfaffected · git
    • 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and later · before cae0dfed5d307b240bff71c3cf206652d1b6f215affected · git
    • 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and later · before 5b8f46864f06d6dbacb7dcea52bc084dfd122638affected · git
    • 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and later · before 246df90b5f1a8a6e6abbd2f058b029558720adecaffected · git
    • before 4.3not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.8-17.1.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-74509Aug 15, 2026 · Bluetooth: hci_sync: Fix advertising data UAFs
    35Monitor
  • ← EarlierCVE-2026-74510Aug 15, 2026 · Bluetooth: mgmt: fix UAF in pair command cancellation
    31Monitor
  • Later →CVE-2026-74513Aug 15, 2026 · dibs: fix use-after-free of dmb_node in loopback attach/detach/unregister
    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 Linux246df90b5f1a8a6e6abbd2f058b029558720adecVendor (CNA)
Linux Linux3f82927b399d7a276c0c12b6ff4424b747a0c9a7Vendor (CNA)
Linux Linux45bf3df5b32e5a49953e7ceabc55f7dd85380e46Vendor (CNA)
Linux Linux5b8f46864f06d6dbacb7dcea52bc084dfd122638Vendor (CNA)
Linux Linux78bde7e9bd36eaae1b8e8cfcd47f12a34f301dbfVendor (CNA)
Linux Linux8ae135a8962be9d4e8a131eb18eb06cdf02a47ceVendor (CNA)
Linux Linux93616c567469510b7bba55b2674e0c4523fd7e64Vendor (CNA)
Linux Linuxcae0dfed5d307b240bff71c3cf206652d1b6f215Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.152.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package registry (OSV)

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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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)

—

CVSS vector

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

nvd-secondary

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.

References

Show all references (7 more)

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

All records