{ "schema_version": "1.6.1", "id": "RPI-CVE-2025-40331", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2025-40331" ], "published": "2025-12-09T04:10:29Z", "summary": "sctp: Prevent TOCTOU out-of-bounds write", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: Prevent TOCTOU out-of-bounds write\n\nFor the following path not holding the sock lock,\n\n sctp_diag_dump() -> sctp_for_each_endpoint() -> sctp_ep_dump()\n\nmake sure not to exceed bounds in case the address list has grown\nbetween buffer allocation (time-of-check) and write (time-of-use).", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1", 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"https://git.kernel.org/stable/c/3006959371007fc2eae4a078f823c680fa52de1a" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/72e3fea68eac8d088e44c3dd954e843478e9240e" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/584307275b2048991b2e8984962189b6cc0a9b85" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c9119f243d9c0da3c3b5f577a328de3e7ffd1b42" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/2fe08fcaacb7eb019fa9c81db39b2214de216677" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/89eac1e150dbd42963e13d23828cb8c4e0763196" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/95aef86ab231f047bb8085c70666059b58f53c09" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T12:19:11Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.8, "cvss_v3_severity": "High", "scenario": "AV:L - Triggering requires local syscalls \u2014 a `NETLINK_SOCK_DIAG` dump request plus a concurrent `setsockopt(SCTP_SOCKOPT_BINDX_ADD)` on the attacker's own socket. A remote SCTP peer cannot drive the diag dump, so despite being in net/sctp this is the local netlink/diag surface.\nAC:L - The attacker owns both sides of the race \u2014 one thread hammers the diag dump, another calls sctp_bindx on its own endpoint \u2014 and the vulnerable window spans the entire unbounded write loop, which the attacker lengthens by pre-binding many addresses. Failed attempts are harmless and can be retried indefinitely.\nPR:L - No capability check exists anywhere on the sock_diag/inet_diag dump path (the `net_admin` flag only selects optional attributes), and sctp_do_bind only needs CAP_NET_BIND_SERVICE for ports below 1024, which the attacker avoids. Any unprivileged local user with an SCTP socket can do this, without namespaces.\nUI:N - The attacker creates the SCTP endpoint, issues the diag dump, and grows the address list entirely on its own. No victim action of any kind is involved.\nS:U - The corruption is confined to kernel heap memory managed by the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The same TOCTOU in the shrink direction leaves the tail of the reserved INET_DIAG_LOCALS attribute uninitialized and copies that kernel heap data straight to userspace, and the heap overflow itself corrupts skb_shared_info (frag_list/destructor_arg), which is readily leveraged into arbitrary kernel memory disclosure.\nI:H - This is a heap out-of-bounds write with attacker-chosen length \u2014 a single bindx call can append ~8000 addresses, yielding up to ~1 MB written past the reserved region \u2014 and partially attacker-controlled content, smashing skb_shared_info and adjacent slab objects, which is a strong path to control-flow hijack and privilege escalation.\nA:H - Overwriting skb_shared_info and neighbouring allocations with sockaddr data reliably produces oopses and kernel panics on subsequent skb handling. Any unprivileged user can repeat the attack at will." } } }