Kernel memory corruption via unchecked SCTP INIT length
Published Jun 25, 2026 · Updated Jun 25, 2026
Out-of-bounds memory access in the Linux kernel allows remote attackers to corrupt kernel memory via crafted SCTP COOKIE_ECHO packets. The sctp_unpack_cookie() path trusts the cached peer INIT chunk length, so sctp_walk_params() and later kmemdup() copies can pass the remaining COOKIE_ECHO buffer. Reachability requires a listening SCTP endpoint and, for cookie modification, disabled SCTP cookie HMAC; the flaw can disclose memory, corrupt association state, or crash the kernel.
Summary
What happened
Out-of-bounds memory access in the Linux kernel allows remote attackers to corrupt kernel memory via crafted SCTP COOKIE_ECHO packets. The sctp_unpack_cookie() path trusts the cached peer INIT chunk length, so sctp_walk_params() and later kmemdup() copies can pass the remaining COOKIE_ECHO buffer. Reachability requires a listening SCTP endpoint and, for cookie modification, disabled SCTP cookie HMAC; the flaw can disclose memory, corrupt association state, or crash the kernel.
The record
- CVE
- CVE-2026-53246
- Published
- Jun 25, 2026
- Updated
- Jun 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-787, T1210
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 25, 2026CVE publishedPublication date reported by the CVE source.
- Jun 25, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0861615c28de668669d748ef4eb913ea9262d13b
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cc272185c9a9a4b7febc2de52eeaa3d00f19091e
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <edccbf3d63b0a3362bc916ea72edacc1e1ca456a
- Affected versionversion=2.6.12
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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