CVE-2026-53246sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing When a listening SCTP server processes a COOKIE_ECHO chunk, the cached peer INIT chunk embedded after the cookie is parsed and its parameters are later walked by sctp_process_init() using sctp_walk_params(). However, the chunk header length of this cached INIT chunk was not validated against the remaining buffer in the COOKIE_ECHO payload. If the length field is inflated, the parameter walk can run beyond the actual received data, leading to out-of-bounds reads and potential memory corruption during later parameter handling (e.g. STATE_COOKIE processing and kmemdup() copies). Add a bounds check in sctp_unpack_cookie() to ensure the cached INIT chunk length does not exceed the available data in the COOKIE_ECHO buffer before it is used.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before cc272185c9a9a4b7febc2de52eeaa3d00f19091e; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before edccbf3d63b0a3362bc916ea72edacc1e1ca456a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 0861615c28de668669d748ef4eb913ea9262d13b | CNA record |
linux linux_kernel linux:linux_kernel | from 2.6.12.1 before 6.18.36; from 6.19 before 7.0.13; 2.6.12; 2.6.12; 2.6.12; 2.6.12; 2.6.12; 7.1; and 5 more ranges | NVD |
References
- https://git.kernel.org/stable/c/cc272185c9a9a4b7febc2de52eeaa3d00f19091epatch
- https://git.kernel.org/stable/c/edccbf3d63b0a3362bc916ea72edacc1e1ca456apatch
- https://git.kernel.org/stable/c/0861615c28de668669d748ef4eb913ea9262d13bpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.