GHSA-MJCM-HF7X-HM3W

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-09-16 15:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: Fix potential UAF after skb_unshare() failure

If skb_unshare() fails to unshare a packet due to allocation failure in rxrpc_input_packet(), the skb pointer in the parent (rxrpc_io_thread()) will be NULL'd out. This will likely cause the call to trace_rxrpc_rx_done() to oops.

Fix this by moving the unsharing down to where rxrpc_input_call_event() calls rxrpc_input_call_packet(). There are a number of places prior to that where we ignore DATA packets for a variety of reasons (such as the call already being complete) for which an unshare is then avoided.

And with that, rxrpc_input_packet() doesn't need to take a pointer to the pointer to the packet, so change that to just a pointer.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-45998"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416",
      "CWE-825"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:17Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix potential UAF after skb_unshare() failure\n\nIf skb_unshare() fails to unshare a packet due to allocation failure in\nrxrpc_input_packet(), the skb pointer in the parent (rxrpc_io_thread())\nwill be NULL\u0027d out.  This will likely cause the call to\ntrace_rxrpc_rx_done() to oops.\n\nFix this by moving the unsharing down to where rxrpc_input_call_event()\ncalls rxrpc_input_call_packet().  There are a number of places prior to\nthat where we ignore DATA packets for a variety of reasons (such as the\ncall already being complete) for which an unshare is then avoided.\n\nAnd with that, rxrpc_input_packet() doesn\u0027t need to take a pointer to the\npointer to the packet, so change that to just a pointer.",
  "id": "GHSA-mjcm-hf7x-hm3w",
  "modified": "2026-09-16T15:30:36Z",
  "published": "2026-05-27T15:33:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45998"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:34911"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:55445"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:65708"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:65712"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:67721"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:67723"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-45998"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482024"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f2740150f904bfa60e4bad74d65add3ccb5e7f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8fde6296c4d4da2be7ab761305ab7f232b94eefd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/996b0487b3cdda4c91811dbb1c9564626bc840bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bf20f46d94f1db38e6ffc0ca204a5fe0de01b495"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3bf143b1e98fb3d6d9e6825bcd683974d478e8c"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45998.json"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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