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Linux Kernel CVE-2026-53153

| EUVDEUVD-2026-39244 HIGH
Missing Synchronization (CWE-820)
2026-06-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-x5g3-hx3c-gfxx
7.8
CVSS 3.1 · Vendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Severity by source

Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.0 HIGH

Local access and cgroup-manipulation privileges give AV:L/PR:L; winning a narrow reparent race window justifies AC:H; kernel list corruption yields full C/I/A impact.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Red Hat
7.0 HIGH
qualitative

Primary rating from Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67).

CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jun 28, 2026 - 09:16 vuln.today
CVSS changed
Jun 28, 2026 - 08:22 NVD
7.8 (HIGH)
Patch available
Jun 25, 2026 - 10:32 EUVD
CVE Published
Jun 25, 2026 - 09:16 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 25, 2026 - 09:16 cve.org
HIGH 7.8

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

mm/list_lru: drain before clearing xarray entry on reparent

memcg_reparent_list_lrus() clears the dying memcg's xarray entry with xas_store(&xas, NULL) before reparenting its per-node lists into the parent. This opens a window where a concurrent list_lru_del() arriving for the dying memcg sees xa_load() == NULL, walks to the parent in lock_list_lru_of_memcg(), takes the parent's per-node lock, and calls list_del_init() on an item still physically linked on the dying memcg's list.

If another in-flight thread holds the dying memcg's per-node lock at the same moment (another list_lru_del, or a list_lru_walk_one running an isolate callback), both threads modify ->next/->prev pointers on the same physical list under different locks. Adjacent items can corrupt each other's links.

Fix it by reversing the order: reparent each per-node list and mark the child's list lru dead and then clear the xarray entry. Any concurrent list_lru op that finds the still-set xarray entry either takes the dying memcg's per-node lock (synchronizing with the drain) or sees LONG_MIN and walks to the parent, where the items now live.

AnalysisAI

Kernel memory corruption in the Linux memory-management list_lru subsystem (memory cgroup reparenting path) allows a local user to corrupt linked-list pointers and destabilize or potentially escalate privileges on the system. The flaw is a race condition in memcg_reparent_list_lrus(), affecting kernels from 6.13 onward; it carries CVSS 7.8 (High) with full confidentiality, integrity and availability impact but a low EPSS of 0.17% (7th percentile). There is no public exploit identified at time of analysis and it is not listed in CISA KEV.

Technical ContextAI

The affected component is the kernel's list_lru infrastructure (mm/list_lru.c), a per-memcg, per-node LRU list mechanism used for reclaimable kernel objects (e.g., dentry/inode shrinker caches) tracked per memory cgroup. When a memory cgroup dies, memcg_reparent_list_lrus() migrates its per-node lists into the parent cgroup. The original code cleared the dying memcg's xarray entry with xas_store(&xas, NULL) BEFORE reparenting the lists, opening a TOCTOU window: a concurrent list_lru_del() that observed xa_load()==NULL would walk to the parent, take the parent's per-node lock, and call list_del_init() on an item still physically linked on the dying memcg's list - while another thread holding the dying memcg's per-node lock manipulated the same physical list under a different lock, corrupting ->next/->prev pointers. The root-cause class is a concurrency/race condition (CWE-362, leading to CWE-787 out-of-bounds/linked-list corruption), even though NVD records the CWE as N/A. The fix reverses ordering: reparent each list and mark the child list_lru dead first, then clear the xarray entry, so any concurrent op either synchronizes on the dying memcg's lock or correctly finds the items in the parent.

RemediationAI

Upstream fix available (commits), released patched version reported by EUVD as 6.18.36 and 7.0.13 on their respective stable branches - upgrade to a stable kernel that contains commit 2b66496d794e98f7aeec7688573051f22ec40bac, 98733f3f0becb1ae0701d021c1748e974e5fa55c, or c19ff4351214f059349788e13e70e74325831ff6 as appropriate to your branch (see https://git.kernel.org/stable/c/2b66496d794e98f7aeec7688573051f22ec40bac and the two sibling commits). Apply your distribution's kernel security update once it ships the backport and reboot. As a compensating control where immediate patching is impossible, restrict the ability of untrusted local users and containers to create and tear down memory cgroups (e.g., constrain delegated cgroup subtrees and limit unprivileged user namespaces via sysctl such as kernel.unprivileged_userns_clone=0), which reduces the attacker's ability to drive rapid memcg reparenting - at the cost of breaking rootless container and nested-cgroup workflows that legitimately rely on those features. No reliable in-kernel runtime workaround exists short of the code fix.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected

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CVE-2026-53153 vulnerability details – vuln.today

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