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Linux Kernel CVE-2026-80718

| EUVDEUVD-2026-67453 HIGH
2026-08-28 Linux GHSA-wv7w-q623-9gwq
Linux Buffer Overflow Red Hat Suse
7.8
CVSS 3.1 · Vendor: Linux
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Severity by source

Vendor (Linux) 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

AC raised to H because overflow only triggers when nr_units > 1 in SMP/NUMA percpu-km, a non-default condition requiring specific hardware topology.

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:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.0 MEDIUM
qualitative

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

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
Aug 29, 2026 - 08:14 vuln.today
CVSS changed
Aug 29, 2026 - 07:22 NVD
7.8 (HIGH)
Patch available
Aug 28, 2026 - 09:02 EUVD
CVE Published
Aug 28, 2026 - 06:53 cve.org
UNKNOWN (no severity yet)
CVE Published
Aug 28, 2026 - 06:53 cve.org
HIGH 7.8

DescriptionCVE.org

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

mm/percpu-km: fix bitmap overflow and accounting in pcpu_create_chunk()

In pcpu_create_chunk(), nr_pages is the total contiguous backing allocation, i.e., nr_units * pcpu_unit_pages, but pcpu_chunk_populated() uses it to set chunk->populated, whose size is pcpu_unit_pages, bitmap. Since bit N in chunk->populated means page offset N inside every unit is backed. When nr_units > 1, the function writes beyond chunk->populated. Fix it by using chunk->nr_pages.

It also fixes the global pcpu_nr_empty_pop_pages accounting, since pcpu_balance_free() only iterates up to chunk->nr_pages.

Commit a63d4ac4ab609 ("percpu: make percpu-km set chunk->populated bitmap properly") introduced the bitmap overflow issue. Later, commit b539b87fed37f ("percpu: implmeent pcpu_nr_empty_pop_pages and chunk->nr_populated") added pcpu_nr_empty_pop_pages and caused the accounting issue.

AnalysisAI

Bitmap overflow and incorrect global accounting in the Linux kernel's percpu-km memory allocator (mm/percpu-km) allow a local low-privileged attacker on SMP/NUMA systems to corrupt kernel memory, with potential for privilege escalation or kernel crash. Two separate commits introduced the flaws: a63d4ac4ab609 caused pcpu_create_chunk() to write beyond the chunk->populated bitmap when nr_units > 1, and b539b87fed37f introduced the companion pcpu_nr_empty_pop_pages accounting error. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires a Linux kernel build using the percpu-km allocator in an SMP or NUMA configuration where `nr_units > 1` - this is the specific arithmetic condition that causes `nr_pages` to exceed the bitmap bound; single-unit systems are not affected by the overflow. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The NVD CVSS 3.1 vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H scores 7.8, reflecting local exploitation with high C/I/A impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation The primary fix is to upgrade the Linux kernel to a patched stable release: 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8, or 7.2, depending on the branch in use. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Linux systems running kernel versions 5.10.x through 7.2.x on multi-processor or NUMA configurations and prioritize by workload criticality. …

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

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CVE-2026-80718 vulnerability details – vuln.today
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