{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-26950",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-26950"
  ],
  "published": "2024-05-01T05:22:01Z",
  "summary": "wireguard: netlink: access device through ctx instead of peer",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwireguard: netlink: access device through ctx instead of peer\n\nThe previous commit fixed a bug that led to a NULL peer->device being\ndereferenced. It's actually easier and faster performance-wise to\ninstead get the device from ctx->wg. This semantically makes more sense\ntoo, since ctx->wg->peer_allowedips.seq is compared with\nctx->allowedips_seq, basing them both in ctx. This also acts as a\ndefence in depth provision against freed peers.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-26950"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/493aa6bdcffd90a4f82aa614fe4f4db0641b4068"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4be453271a882c8ebc28df3dbf9e4d95e6ac42f5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/09c3fa70f65175861ca948cb2f0f791e666c90e5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c991567e6c638079304cc15dff28748e4a3c4a37"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/93bcc1752c69bb309f4d8cfaf960ef1faeb34996"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d44bd323d8bb8031eef4bdc44547925998a11e47"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/71cbd32e3db82ea4a74e3ef9aeeaa6971969c86f"
    }
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    "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": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable code is reached only through the WireGuard generic-netlink family (`WG_CMD_GET_DEVICE` dump plus `WG_CMD_SET_DEVICE`), which requires a local netlink socket. Per kernel scoring guidance, netlink-driven configuration paths are Local.\nAC:L - The attacker controls both halves of the sequence \u2014 partially draining a multi-message dump, then replacing all peers to free the cursor peer, then resuming the same dump socket \u2014 so no uncontrolled timing window is involved and the upstream reproducer triggers it reliably.\nPR:L - The op is gated by `GENL_UNS_ADMIN_PERM`, i.e. `netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)`, which an unprivileged user obtains inside `unshare -Urn` where they can also create the wireguard interface. That is low privilege, not real root.\nUI:N - The entire sequence is performed by the attacker's own processes via netlink; no victim action, mount, or file open is required.\nS:U - The freed `wg_peer` and the corrupted/leaked data all live in the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `get_peer()` on a dangling peer copies freed slab contents \u2014 including `handshake.remote_static`, `preshared_key`, and endpoint data \u2014 straight into the netlink reply delivered to userspace, and a reallocated peer makes `peer->device` an attacker-influenced pointer that is then dereferenced, yielding an arbitrary read primitive.\nI:H - The same path performs `down_read()`/`up_read()` on the freed object, executing atomic read-modify-write operations into reclaimed slab memory; a use-after-free of this shape is exploitable via heap grooming for controlled writes and control-flow influence.\nA:H - In the common case the freed peer is zeroed by `memzero_explicit()`, making `peer->device->peer_allowedips.seq` a NULL pointer dereference and an immediate kernel oops, with the sibling report showing a KASAN slab-use-after-free on the same path."
    }
  }
}