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CVE PROGRAM SOURCE RECORD9.1 Critical

CVE-2026-53224

sctp: validate embedded INIT chunk and address list lengths in cookie

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: sctp: validate embedded INIT chunk and address list lengths in cookie sctp_unpack_cookie() only checked that the embedded INIT chunk length did not exceed the remaining cookie payload, but did not ensure that the INIT chunk is large enough to contain a complete INIT header. A malformed COOKIE_ECHO can therefore carry a truncated INIT chunk whose length field is smaller than sizeof(struct sctp_init_chunk). Later, sctp_process_init() accesses INIT parameters unconditionally, which may lead to out-of-bounds reads. In addition, raw_addr_list_len is not fully validated against the remaining cookie payload. When cookie authentication is disabled, an attacker can supply an oversized raw_addr_list_len and cause sctp_raw_to_bind_addrs() to read beyond the end of the cookie. The address parser also lacks sufficient bounds checks for parameter headers and lengths, allowing malformed address parameters to trigger out-of-bounds reads. Fix this by: - requiring the embedded INIT chunk length to be at least sizeof(struct sctp_init_chunk); - validating that the INIT chunk and raw address list together fit within the cookie payload; - verifying sufficient data exists for each address parameter header and payload before parsing it. Note that sctp_verify_init() must be called after sctp_unpack_cookie() and before sctp_process_init() when cookie authentication is disabled. This will be addressed in a separate patch.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < b1ca7dcfb335caa2c73d2d1bb5710e6dea2c11e0affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < dd75066882ecc4ec8df3f5384b4b9fa9579be8f0affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 29ab56e7660b6f849c10c46e87e085649df751ebaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 7560afb8cddafd829e709d7ea09230e45a825557affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 512a9bb77c04ac9927648ea58af617e472be96e6affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6f4c80a2a7e6d06753b89a578b710a2499a5e62baffected

Linux Linux

Default version status: affected

  • 2.6.12affected
  • 0 to < 2.6.12unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.114 to ≤ 6.12.*unaffected
  • 6.18.36 to ≤ 6.18.*unaffected
  • 7.0.13 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References