CVE-2023-6531

Kernel: gc's deletion of an skb races with unix_stream_read_generic() leading to uaf

HIGH
7
CVSS Score
Published: January 21, 2024 at 10:01 AM UTC
Updated: August 6, 2026 at 10:30 PM UTC
2 products affected across 2 vendorsLinux KernelEnterprise Linux

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Severity
HIGH7
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

A use-after-free flaw was found in the Linux Kernel due to a race problem in the unix garbage collector's deletion of SKB races with unix_stream_read_generic() on the socket that the SKB is queued on.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Affected range stops below 6.7, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 0:5.14.0-427.13.1.el9_4 (unaffected)
Vendor states this is fixed in 6 (unaffected)
Vendor states this is fixed in 7 (unaffected)
Vendor states this is fixed in 8 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7HIGHredhat
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-362

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