CVE-2023-4732

Kernel: race between task migrating pages and another task calling exit_mmap to release those same pages getting invalid opcode bug in include/linux/swapops.h

MEDIUM
4.7
CVSS Score
Published: October 3, 2023 at 04:55 PM UTC
Updated: June 17, 2026 at 06:38 AM UTC
10 products affected across 2 vendorsLinux KernelEnterprise LinuxEnterprise Linux for IBM Z Systems

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Severity
MEDIUM4.7
Exploit prediction
EPSS 0.2%

Description

A flaw was found in pfn_swap_entry_to_page in memory management subsystem in the Linux Kernel. In this flaw, an attacker with a local user privilege may cause a denial of service problem due to a BUG statement referencing pmd_t x.

Affected

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

v ≤ 5.13.19
Vendor states this is fixed in 0:4.18.0-372.87.1.el8_6 (unaffected)
Vendor states this is fixed in 0:4.18.0-477.36.1.el8_8 (unaffected)
Vendor states this is fixed in 0:4.18.0-513.5.1.el8_9 (unaffected)
Vendor states this is fixed in 0:4.18.0-513.5.1.rt7.307.el8_9 (unaffected)
Vendor states this is fixed in 6 (unaffected)
Vendor states this is fixed in 7 (unaffected)
Vendor states this is fixed in 9 (unaffected)

Remediation

No guide yet

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

References (6)

Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2023:6901
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2023:7077
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2023:7539
VDB Entryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/security/cve/CVE-2023-4732
Issue Trackingx_refsource_REDHATThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2236982

CVSS

4.7MEDIUMredhat
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-366CWE-362

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