{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50299",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-50299"
  ],
  "published": "2024-11-19T01:35:04Z",
  "summary": "sctp: properly validate chunk size in sctp_sf_ootb()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: properly validate chunk size in sctp_sf_ootb()\n\nA size validation fix similar to that in Commit 50619dbf8db7 (\"sctp: add\nsize validation when walking chunks\") is also required in sctp_sf_ootb()\nto address a crash reported by syzbot:\n\n  BUG: KMSAN: uninit-value in sctp_sf_ootb+0x7f5/0xce0 net/sctp/sm_statefuns.c:3712\n  sctp_sf_ootb+0x7f5/0xce0 net/sctp/sm_statefuns.c:3712\n  sctp_do_sm+0x181/0x93d0 net/sctp/sm_sideeffect.c:1166\n  sctp_endpoint_bh_rcv+0xc38/0xf90 net/sctp/endpointola.c:407\n  sctp_inq_push+0x2ef/0x380 net/sctp/inqueue.c:88\n  sctp_rcv+0x3831/0x3b20 net/sctp/input.c:243\n  sctp4_rcv+0x42/0x50 net/sctp/protocol.c:1159\n  ip_protocol_deliver_rcu+0xb51/0x13d0 net/ipv4/ip_input.c:205\n  ip_local_deliver_finish+0x336/0x500 net/ipv4/ip_input.c:233",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-50299"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/67b9a278b80f71ec62091ded97c6bcbea33b5ec3"
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    {
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      "url": "https://git.kernel.org/stable/c/9b5d42aeaf1a52f73b003a33da6deef7df34685f"
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      "url": "https://git.kernel.org/stable/c/40b283ba76665437bc2ac72079c51b57b25bff9e"
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      "url": "https://git.kernel.org/stable/c/a758aa6a773bb872196bcc3173171ef8996bddf0"
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      "url": "https://git.kernel.org/stable/c/bf9bff13225baf5f658577f7d985fc4933d79527"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.2,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The vulnerable chunk walk is driven entirely by the contents of a received SCTP packet processed in `sctp_rcv()` \u2192 `sctp_endpoint_bh_rcv()` \u2192 `sctp_do_sm()` \u2192 `sctp_sf_ootb()`. Any remote host that can route an IPv4/IPv6 SCTP packet to the target reaches it.\nAC:L - The attacker fully controls the packet: a single chunk followed by 1\u20133 trailing bytes with a computable CRC32c checksum deterministically drives the loop one iteration past the last complete chunk. No race, no memory-layout dependency, no victim state required.\nPR:N - `__sctp_rcv_lookup_endpoint()` falls back to the per-netns `ctl_sock` endpoint, so out-of-the-blue packets are processed in `SCTP_STATE_CLOSED` even with no listening SCTP socket and no association. The attacker needs no credentials or prior handshake.\nUI:N - The bug triggers in softirq packet-receive context on arrival of the malformed packet. No local user has to open, mount, or configure anything.\nS:U - The out-of-bounds read and any resulting fault stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:L - The chunk-length field is read up to 2 bytes past `skb_tail_pointer()` into uninitialized kernel memory, a genuine read outside the intended buffer. It is strictly bounded to those 2 bytes and both resulting branches converge on `sctp_sf_violation_chunklen()`, so the value is not echoed back \u2014 limited rather than arbitrary disclosure.\nI:N - The defect is purely a read; no kernel memory is written out of bounds and no attacker-influenced data alters kernel state beyond the standard ABORT response the packet would trigger anyway.\nA:H - The upstream commit describes the issue as a crash, and the syzbot KMSAN report is fatal on kernels with panic_on_warn, so an unauthenticated remote attacker can repeatedly panic an affected system by replaying the malformed packet."
    }
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}