rxrpc: Fix the ACK parser to extract the SACK table for parsing

{
  "id": "a021ac28fc994916896ab3518b4f9525518d8dc618e7c04c6aec19ff4fceb362",
  "url": "https://osv.dev/vulnerability/CVE-2026-53151",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "rxrpc: Fix the ACK parser to extract the SACK table for parsing",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix the ACK parser to extract the SACK table for parsing Fix modification of the received skbuff in rxrpc_input_soft_acks() and a potential incorrect access of the buffer in a fragmented UDP packet (the packet would probably have to be deliberately pre-generated as fragmented) when AF_RXRPC tries to extract the contents of the SACK table by copying out the contents of the SACK table into a buffer before attempting to parse AF_RXRPC assumes that it can just call skb_condense() and then validly access the SACK table from skb->data and that it will be a flat buffer - but skb_condense() can silently fail to do anything under some circumstances. Note that whilst rxrpc_input_soft_acks() should be able to parse extended ACKs, the rest of AF_RXRPC doesn't currently support that. Further, there's then no need to call skb_condense() in rxrpc_input_ack(), so don't.",
    "evidence": "osv:CVE-2026-53151",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.6.144",
            "evidence": "/affected/1/ranges"
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            "value": "6.12.95",
            "evidence": "/affected/1/ranges"
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          {
            "value": "7.0.13",
            "evidence": "/affected/1/ranges"
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    "severity": "critical",
    "structured": {
      "id": "CVE-2026-53151",
      "aliases": [
        "CVE-2026-53151"
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
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            "ecosystem": "Linux"
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      "modified": "2026-10-28T02:30:36.742103139Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/224298450be5c04d2a6ea1c2a94669d7ebf65d00",
        "https://git.kernel.org/stable/c/333b6d5bb9f87827ac2639c737bf9613dbae7253",
        "https://git.kernel.org/stable/c/566c4c1244de50fbff1f89ff93c9d7b0fc256db4",
        "https://git.kernel.org/stable/c/5d1ae4e17a3ecd8561cdb4f4f70152f41039c4e1",
        "https://git.kernel.org/stable/c/775c5e89272a2615b72bb84f611ba66fa3b7493e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53151.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53151",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53151.json"
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    "related_cves": [
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        "value": "CVE-2026-53151",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504006,
  "published_at": "2026-06-25T08:38:36.187+00:00"
}