CVE intelligence and bounded remediation

CVE-2023-4732 — A flaw was found in pfn_swap_entry_to_page in memory management subsystem in the Linux Kernel

Medium CVSS 4.7

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.

Severity
Medium
CVSS
4.7 (3.1)
Published
2023-10-03
CISA KEV
Not currently listed
Ecosystem
linux/kernel
Weaknesses
CWE-366, CWE-362

Affected products

  • linux / linux_kernel
  • redhat / codeready_linux_builder / 8.0
  • redhat / codeready_linux_builder_for_arm64 / 8.0_aarch64
  • redhat / codeready_linux_builder_for_power_little_endian / 8.0_ppc64le
  • redhat / enterprise_linux / 8.0
  • redhat / enterprise_linux_for_arm_64 / 8.0_aarch64

Showing 6 representative product identities from 10 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Race condition, TOCTOU, and lifecycle synchronization

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Map concurrent actors, shared state, lock boundaries, signals, callbacks, retries, and check-then-use sequences in the affected path.
  • Determine whether untrusted users can influence timing, object names, filesystem state, or repeated state transitions.
  • Identify clustered and multi-process behavior that repository-local tests may not represent.

Remediate safely

  • Make the sensitive state transition atomic or protect it with a consistently ordered synchronization primitive.
  • Perform authorization and invariant checks on the same authoritative object and transaction used for the operation.
  • Use unique private resources, safe ownership transfer, and idempotent operations; add deterministic concurrency regression tests.

Authoritative sources

Complete CVE record and remediation plan

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