Kernel memory disclosure or crash via pointer scaling
Published Apr 24, 2026 · Updated Apr 24, 2026
Out-of-bounds read in Linux Kernel rxrpc allows remote attackers to read kernel memory or crash systems via malformed RESPONSE authenticators. rxgk_verify_authenticator() treats the byte-sized auth_len as a count of __be32 elements when forming the parser limit, extending it to four times the allocated temporary buffer. Network access to an rxrpc endpoint is sufficient; parsing the crafted authenticator reads beyond the allocation and can expose adjacent memory or trigger a kernel crash.
Summary
What happened
Out-of-bounds read in Linux Kernel rxrpc allows remote attackers to read kernel memory or crash systems via malformed RESPONSE authenticators. rxgk_verify_authenticator() treats the byte-sized auth_len as a count of __be32 elements when forming the parser limit, extending it to four times the allocated temporary buffer. Network access to an rxrpc endpoint is sufficient; parsing the crafted authenticator reads beyond the allocation and can expose adjacent memory or trigger a kernel crash.
The record
- CVE
- CVE-2026-31636
- Published
- Apr 24, 2026
- Updated
- Apr 24, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-125, T1210
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 24, 2026CVE publishedPublication date reported by the CVE source.
- Apr 24, 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=6.16
- Affected versionversion=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <20a188775a9a9982d1987e12660d9b44b40a6c99
- Affected versionversion=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <3e3138007887504ee9206d0bfb5acb062c600025
- Affected versionversion=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <7875f3d9777bd4e9892c4db830571ab8ac2044c0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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