Kernel crash via Squashfs xattr count overflow
Published Mar 27, 2025 · Updated May 23, 2026
Integer overflow in Linux kernel Squashfs allows local users to crash the system by processing a corrupted filesystem image. The xattr ID parser stores an untrusted 32-bit count in a signed integer and performs width-dependent multiplication and rounding that overflow to a zero-length table, bypassing its size sanity check. Exploitation requires local access sufficient to make the kernel process the crafted image, and the published assessment limits the consequence to loss of availability.
Summary
What happened
Integer overflow in Linux kernel Squashfs allows local users to crash the system by processing a corrupted filesystem image. The xattr ID parser stores an untrusted 32-bit count in a signed integer and performs width-dependent multiplication and rounding that overflow to a zero-length table, bypassing its size sanity check. Exploitation requires local access sufficient to make the kernel process the crafted image, and the published assessment limits the consequence to loss of availability.
The record
- CVE
- CVE-2023-52933
- Published
- Mar 27, 2025
- Updated
- May 23, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 27, 2025CVE publishedPublication date reported by the CVE source.
- May 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=3654a0ed0bdc6d70502bfc7c9fec9f1e243dfcad <1369322c1de52c7b9b988b95c9903110a4566778
- Affected versionversion=4.14.222 <4.14.306
- Affected versionversion=4.19.176 <4.19.273
- Affected versionversion=4.4.258 <4.5
- Affected versionversion=4.9.258 <4.10
- Affected versionversion=506220d2ba21791314af569211ffd8870b8208fa <997bed0f3cde78a3e639d624985bf4a95cf767e6
- Affected versionversion=506220d2ba21791314af569211ffd8870b8208fa <a7da7d01ac5ce9b369a1ac70e1197999cc6c9686
- Affected versionversion=506220d2ba21791314af569211ffd8870b8208fa <f65c4bbbd682b0877b669828b4e033b8d5d0a2dc
- Affected versionversion=5.10.16 <5.10.168
- Affected versionversion=5.11
- Affected versionversion=5.4.98 <5.4.232
- Affected versionversion=91d4f4d0d7bcd6abd9f9288ff40f4edc716f3d4b
- Affected versionversion=a8717b34003f4f7353b23826617ad872f85d85d8 <b38c3e9e0adc01956cc3e5a52e4d3f92f79d88e2
- Affected versionversion=bddcce15cd1fb9675ddd46a76d8fe2d0a571313b <5c4d4a83bf1a862d80c1efff1c6e3ce33b501e2e
- Affected versionversion=eca93bf20f70e0f78c8c28720951942f61a49117
- Affected versionversion=ff49cace7b8cf00d27665f7536a863d406963d06 <7fe583c9bec10cd4b76231c51b37f3e4ca646e01
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
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Your stack
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