CVE-2023-52939: mm: memcg: fix NULL pointer in mem_cgroup_track_foreign_dirty_slowpath()

mediumCVSS 5.5CVE-2023-52939

CSIRTS triage

vendor: Linux product: Linux kernel Denial of service

What: A NULL pointer dereference in mem_cgroup_track_foreign_dirty_slowpath() causes kernel panic or denial of service.
Who is affected: Systems running affected Linux kernel versions with memory cgroup tracking enabled.
Urgency: Medium severity (CVSS 5.5); kernel DoS requires local access; update at next maintenance.
Action: Apply kernel patch adding NULL pointer checks in memory cgroup foreign dirty tracking.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-52939

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2023-529390.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2023-52939	coverage & exploitation status	NVD · CVE.org

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