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Linux Kernel CVE-2026-53272

| EUVDEUVD-2026-39223 HIGH
Use After Free (CWE-416)
2026-06-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-pc3h-m9mc-v77g
Information Disclosure Linux Use After Free Memory Corruption Red Hat Suse
7.8
CVSS 3.1 · NVD
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Severity by source

NVD 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 low-privilege attacker needs mount/unmount ability (PR:L) and must win a tight teardown race (AC:H); the UAF yields full C/I/A impact within the kernel (S:U).

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
4.7 MEDIUM
AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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
Jul 08, 2026 - 04:08 vuln.today
CVSS changed
Jul 08, 2026 - 04:07 NVD
7.8 (HIGH)
Patch available
Jun 25, 2026 - 10:32 EUVD
CVE Published
Jun 25, 2026 - 09:16 nvd
HIGH 7.8
CVE Published
Jun 25, 2026 - 09:16 cve.org
UNKNOWN (no severity yet)

DescriptionNVD

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

erofs: fix use-after-free on sbi->sync_decompress

z_erofs_decompress_kickoff() can race with filesystem unmount, causing a use-after-free on sbi->sync_decompress.

When I/O completes, z_erofs_endio() calls z_erofs_decompress_kickoff() to queue z_erofs_decompressqueue_work() asynchronously. Then, after all folios are unlocked, unmount workflow can proceed and sbi will be freed before accessing to sbi->sync_decompress.

Thread (unmount) I/O completion kworker queue_work z_erofs_decompressqueue_work (all folios are unlocked) cleanup_mnt .. erofs_kill_sb erofs_sb_free kfree(sbi) access sbi->sync_decompress // UAF!!

AnalysisAI

Use-after-free in the Linux kernel's EROFS filesystem lets a local attacker who can trigger a decompression I/O race during unmount corrupt kernel memory. When z_erofs_decompress_kickoff() queues asynchronous decompression work, a concurrent unmount can free the superblock info (sbi) before the kworker accesses sbi->sync_decompress, producing a CWE-416 use-after-free with high confidentiality, integrity and availability impact (CVSS 7.8). EPSS is low (0.16%, 6th percentile) and there is no public exploit identified at time of analysis; the flaw is not on CISA KEV.

Technical ContextAI

EROFS (Enhanced Read-Only File System) is a compressed, read-only Linux filesystem widely deployed for Android system images, container/OCI image layers, and embedded/appliance firmware. The bug lives in the compressed-data read path: on I/O completion, z_erofs_endio() calls z_erofs_decompress_kickoff() to schedule z_erofs_decompressqueue_work() on a kworker. Because the folios are unlocked before the deferred work reads sbi->sync_decompress, the unmount path (cleanup_mnt -> erofs_kill_sb -> erofs_sb_free -> kfree(sbi)) can free the per-superblock structure first, so the kworker then dereferences freed memory. This is a classic object-lifetime/refcount race (CWE-416 use-after-free) between an asynchronous work queue and superblock teardown, confirmed by the CPE data to affect only the Linux kernel (cpe:2.3:o:linux:linux_kernel).

RemediationAI

Vendor-released patch: upgrade to a fixed Linux kernel - 6.12.94, 6.18.36, 7.0.13, or 7.1 (or later) - or apply the corresponding stable commits (00bf6868, 1aee05e8, 86ab00cf, 95caf60d) from https://git.kernel.org/stable/ that correct the sbi lifetime handling around z_erofs_decompress_kickoff(). For most environments this means taking your distribution's next kernel update and rebooting. Where immediate patching is not possible, reduce exposure by limiting who can mount and unmount EROFS filesystems: avoid auto-mounting untrusted EROFS images from removable media or unprivileged containers, and restrict mount privileges, since triggering the race requires exercising the EROFS decompression path followed by an unmount. These are hardening measures only and do not close the race - the reliable fix is the kernel upgrade. Track distributor advisories via the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-53272 .

Same weakness CWE-416 – Use After Free

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Image SLES15-SP7-Azure-3P Image SLES15-SP7-Azure-Basic Image SLES15-SP7-Azure-Standard Image SLES15-SP7-HPC-Azure Affected
Image SLES15-SP7-BYOS-Azure Image SLES15-SP7-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-Aliyun Image SLES15-SP7-CHOST-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-EC2 Image SLES15-SP7-CHOST-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-GDC Image SLES15-SP7-CHOST-BYOS-SAP-CCloud Image SLES15-SP7-EC2 Image SLES15-SP7-EC2-ECS-HVM Image SLES15-SP7-GCE Image SLES15-SP7-HPC-BYOS-Azure Image SLES15-SP7-HPC-BYOS-EC2 Image SLES15-SP7-HPC-BYOS-GCE Image SLES15-SP7-Hardened-BYOS-Azure Image SLES15-SP7-Hardened-BYOS-EC2 Image SLES15-SP7-Hardened-BYOS-GCE Image SLES15-SP7-SAPCAL-Azure Image SLES15-SP7-SAPCAL-EC2 Image SLES15-SP7-SAPCAL-GCE Affected
Image SLES15-SP7-SAP-Azure Image SLES15-SP7-SAP-Azure-3P Image SLES15-SP7-SAP-BYOS-Azure Image SLES15-SP7-SAP-BYOS-EC2 Image SLES15-SP7-SAP-BYOS-GCE Image SLES15-SP7-SAP-EC2 Image SLES15-SP7-SAP-GCE Image SLES15-SP7-SAP-Hardened-Azure Image SLES15-SP7-SAP-Hardened-BYOS-Azure Image SLES15-SP7-SAP-Hardened-BYOS-EC2 Image SLES15-SP7-SAP-Hardened-BYOS-GCE Image SLES15-SP7-SAP-Hardened-GCE Affected
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed

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CVE-2026-53272 vulnerability details – vuln.today
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