Kernel memory exposure or crash via cache-index mismatch
Published Sep 15, 2025 · Updated Sep 15, 2025
Out-of-bounds access in Linux kernel 3.19 through 6.1.17 and 6.2 through 6.2.4 allows local users to crash the kernel or read memory. The cacheinfo shared_cpu_map builder compares equal cache indexes across CPUs, so a shorter or differently indexed hierarchy drives a slab access past the cache array. Local access is required, and exposure depends on CPUs whose cache levels differ or whose shared cache occupies different indexes.
Summary
What happened
Out-of-bounds access in Linux kernel 3.19 through 6.1.17 and 6.2 through 6.2.4 allows local users to crash the kernel or read memory. The cacheinfo shared_cpu_map builder compares equal cache indexes across CPUs, so a shorter or differently indexed hierarchy drives a slab access past the cache array. Local access is required, and exposure depends on CPUs whose cache levels differ or whose shared cache occupies different indexes.
The record
- CVE
- CVE-2023-53254
- Published
- Sep 15, 2025
- Updated
- Sep 15, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-125
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 15, 2025CVE publishedPublication date reported by the CVE source.
- Sep 15, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <198102c9103fc78d8478495971947af77edb05c1
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2f588d0345d69a35e451077afed428fd057a5e34
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dea49f2993f57d8a2df2cacb0bf649ef49b28879
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo