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NVD / CVE Program· CNA Linux

CVE-2026-74753: perf: Reject exited events as group leaders

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 6.12.108, 6.18.46, 6.2; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 6.12.108, 6.18.46, 6.2; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: perf: Reject exited events as group leaders perf_event_remove_on_exec() sets remove-on-exec events to the EXIT state and detaches their group relationships. The event's file descriptor can remain open, however, and perf_event_open() currently accepts that event as a group leader because its early validation rejects only REVOKED and DEAD events. A new sibling can consequently be linked to the detached leader. When the leader is closed, perf_group_detach() observes that its PERF_ATTACH_GROUP bit is already clear and skips the new sibling. The sibling then retains a group_leader pointer to the freed event. Reject group leaders in the EXIT state. Perform the check while holding the shared context mutex so that an exec in the target task cannot detach the leader between validation and group attachment. [peterz: make the earlier test fully consistent]

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 26, 2026
Updated
Oct 30, 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.

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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

    • 1d3e1102273f09180262496658e7eeed8a5a7b59affected
    • 4cdb1b3ab96eb1b7eb70bc5c82fede334bd60df2 and later · before ce12e1170c0c78dffb9b28af6d287492ae7dd99daffected · git
    • 39358e856fb89e62e3c8d7389a2dc4ec33dbe90e and later · before e593031ff19a9484e8a00bc47edd447187721846affected · git
    • a2d5d3ee7b6e3953114726b1521e62123ab5b043 and later · before 7a03413f31c196ab3894f988cdce0bb47b4fec42affected · git
    • 06ccef0434e98058ddae7bcebc901f93d22b7653 and later · before 7ce010275c531475f9d6e7efb11b9e522c74ed2eaffected · git
    • 037a3c43edfb597665dd34457cd22b14692f2ba3 and later · before fa091f46c3833fb22384f10eade2b4e1e1d0b278affected · git
    • 6.1.191 and later · before 6.2affected · semver
    • 6.6.145 and later · before 6.6.156affected · semver
    • 6.12.96 and later · before 6.12.108affected · semver
    • 6.18.39 and later · before 6.18.46affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.61.1.el10_26.12.0-211.61.1.el10_2

+96

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-2026-74750Aug 26, 2026 · ovpn: defer key slot crypto freeing to workqueue
    30Monitor
  • ← EarlierCVE-2026-74752Aug 26, 2026 · sctp: validate cookie AUTH state before use
    39Monitor
  • Later →CVE-2026-74754Aug 26, 2026 · scsi: core: pair EH runtime PM get and put
    0Monitor

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 Linux6.12.108Vendor (CNA)
Linux Linux6.18.46Vendor (CNA)
Linux Linux6.2Vendor (CNA)
Linux Linux6.6.156Vendor (CNA)
Linux Linux7.1.10Vendor (CNA)
Linux Linux7a03413f31c196ab3894f988cdce0bb47b4fec42Vendor (CNA)
Linux Linux7ce010275c531475f9d6e7efb11b9e522c74ed2eVendor (CNA)
Linux Linuxce12e1170c0c78dffb9b28af6d287492ae7dd99dVendor (CNA)
Linux Linuxe593031ff19a9484e8a00bc47edd447187721846Vendor (CNA)
Linux Linuxfa091f46c3833fb22384f10eade2b4e1e1d0b278Vendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.169.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.169.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-devel4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules-extra4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)
red hat:kernel-rt0:4.18.0-553.169.1.rt7.510.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-core0:4.18.0-553.169.1.rt7.510.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug0:4.18.0-553.169.1.rt7.510.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-core0:4.18.0-553.169.1.rt7.510.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-debuginfo0:4.18.0-553.169.1.rt7.510.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)

+9

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).

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)

—

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.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (4 more)

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

All records