CVE-2025-38514 (GCVE-0-2025-38514)
Vulnerability from cvelistv5
Published
2025-08-16 10:55
Modified
2026-08-05 12:02
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix oops due to non-existence of prealloc backlog struct If an AF_RXRPC service socket is opened and bound, but calls are preallocated, then rxrpc_alloc_incoming_call() will oops because the rxrpc_backlog struct doesn't get allocated until the first preallocation is made. Fix this by returning NULL from rxrpc_alloc_incoming_call() if there is no backlog struct. This will cause the incoming call to be aborted.
References
Impacted products
Vendor Product Version
Linux Linux Version: 248f219cb8bcbfbd7f132752d44afa2df7c241d1
Version: 248f219cb8bcbfbd7f132752d44afa2df7c241d1
Version: 248f219cb8bcbfbd7f132752d44afa2df7c241d1
Version: 248f219cb8bcbfbd7f132752d44afa2df7c241d1
Version: 248f219cb8bcbfbd7f132752d44afa2df7c241d1
Version: 248f219cb8bcbfbd7f132752d44afa2df7c241d1
Version: 248f219cb8bcbfbd7f132752d44afa2df7c241d1
Version: 248f219cb8bcbfbd7f132752d44afa2df7c241d1
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            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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        "title": "CVE Program Container"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix oops due to non-existence of prealloc backlog struct\n\nIf an AF_RXRPC service socket is opened and bound, but calls are\npreallocated, then rxrpc_alloc_incoming_call() will oops because the\nrxrpc_backlog struct doesn\u0027t get allocated until the first preallocation is\nmade.\n\nFix this by returning NULL from rxrpc_alloc_incoming_call() if there is no\nbacklog struct.  This will cause the incoming call to be aborted."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The oops is driven entirely by a received UDP/rxrpc datagram processed in the endpoint\u0027s I/O thread (`rxrpc_encap_rcv` \u2192 `rxrpc_input_packet` \u2192 `rxrpc_new_incoming_call`), and AF_RXRPC services live on routable UDP ports such as the well-known AFS callback port 7001. Any remote host able to send a packet to that port reaches the vulnerable function.\nAC:L - A single well-formed rxrpc DATA packet (seq!=0, callNumber!=0, matching serviceId, securityIndex 0) deterministically dereferences the NULL backlog pointer \u2014 no race, memory-layout, or timing dependency in the packet path itself, and the well-known service IDs are protocol constants. The attacker can simply keep the port fed so any bind\u2192listen window (as in `afs_open_socket`) is hit, and sockets bound without listening are persistently exposed.\nPR:N - The attacker is an unauthenticated remote peer holding no credentials on the victim: `rxrpc_get_incoming_security()` accepts `RXRPC_SECURITY_NONE` with no key at all, and even for secured services the CHALLENGE is only queued after `rxrpc_alloc_incoming_call()` has already crashed. The same crash is also reachable by a plain unprivileged local user, since `rxrpc_create()`/`rxrpc_bind()` require no capability.\nUI:N - The crash happens autonomously inside the rxrpc I/O kernel thread while processing an inbound packet against an already-bound service socket. No victim action, mount, or file access is part of the attack.\nS:U - The NULL dereference and its consequences are confined to the kernel of the host running the AF_RXRPC service socket, with no crossing into a hypervisor, IOMMU, or sandbox authority.\nC:N - The faulting access is a read of `b-\u003ecall_backlog_head` at offset 4 from NULL, which is below `mmap_min_addr` and faults immediately. No kernel memory contents are returned to the attacker or leaked to userspace.\nI:N - Execution aborts on the very first load in `rxrpc_alloc_incoming_call()`, before any of the subsequent stores (`peer-\u003esrx = *peer_srx`, `conn-\u003elocal = ...`) are reached. Nothing is written or corrupted, so no overwrite or control-flow hijack primitive exists.\nA:H - The dereference oopses the rxrpc I/O kthread while it holds `read_lock_irq(\u0026local-\u003eservices_lock)` and `spin_lock(\u0026rx-\u003eincoming_lock)`, so the thread dies with IRQs disabled and both locks permanently held \u2014 all rxrpc/AFS traffic on that endpoint stops and any later bind or socket release spins forever. Under the common `panic_on_oops=1` configuration it is an immediate full system panic, repeatable with one packet."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:02:34.827Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bf0ca6a1bc4fb904b598137c6718785a107e3adf"
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        {
          "url": "https://git.kernel.org/stable/c/f7afb3ff01c42c49e8a143cdce400b95844bb506"
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        {
          "url": "https://git.kernel.org/stable/c/f5e72b7824d08c206ce106d30cb37c4642900ccc"
        },
        {
          "url": "https://git.kernel.org/stable/c/0eef29385d715d4c7fd707b18d4a9b76c76dd5e6"
        },
        {
          "url": "https://git.kernel.org/stable/c/efc1b2b7c1a308b60df8f36bc2d7ce16d3999364"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1ff5f9d2c5405681457262e23c720b08977c11f"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c2e9ebeb036f9b1b09325ec5cfdfe0e78f357c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/880a88f318cf1d2a0f4c0a7ff7b07e2062b434a4"
        }
      ],
      "title": "rxrpc: Fix oops due to non-existence of prealloc backlog struct",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38514",
    "datePublished": "2025-08-16T10:55:01.150Z",
    "dateReserved": "2025-04-16T04:51:24.023Z",
    "dateUpdated": "2026-08-05T12:02:34.827Z",
    "state": "PUBLISHED"
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}


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