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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
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        "summary": "Canonical URL",
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          "date": "2022-01-01T00:00:00Z",
          "number": "1",
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          "date": "2026-08-25T12:54:21Z",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix locking in rxrpc's sendmsg\n\nFix three bugs in the rxrpc's sendmsg implementation:\n\n (1) rxrpc_new_client_call() should release the socket lock when returning\n     an error from rxrpc_get_call_slot().\n\n (2) rxrpc_wait_for_tx_window_intr() will return without the call mutex\n     held in the event that we're interrupted by a signal whilst waiting\n     for tx space on the socket or relocking the call mutex afterwards.\n\n     Fix this by: (a) moving the unlock/lock of the call mutex up to\n     rxrpc_send_data() such that the lock is not held around all of\n     rxrpc_wait_for_tx_window*() and (b) indicating to higher callers\n     whether we're return with the lock dropped.  Note that this means\n     recvmsg() will not block on this call whilst we're waiting.\n\n (3) After dropping and regaining the call mutex, rxrpc_send_data() needs\n     to go and recheck the state of the tx_pending buffer and the\n     tx_total_len check in case we raced with another sendmsg() on the same\n     call.\n\nThinking on this some more, it might make sense to have different locks for\nsendmsg() and recvmsg().  There's probably no need to make recvmsg() wait\nfor sendmsg().  It does mean that recvmsg() can return MSG_EOR indicating\nthat a call is dead before a sendmsg() to that call returns - but that can\ncurrently happen anyway.\n\nWithout fix (2), something like the following can be induced:\n\n\tWARNING: bad unlock balance detected!\n\t5.16.0-rc6-syzkaller #0 Not tainted\n\t-------------------------------------\n\tsyz-executor011/3597 is trying to release lock (&call->user_mutex) at:\n\t[<ffffffff885163a3>] rxrpc_do_sendmsg+0xc13/0x1350 net/rxrpc/sendmsg.c:748\n\tbut there are no more locks to release!\n\n\tother info that might help us debug this:\n\tno locks held by syz-executor011/3597.\n\t...\n\tCall Trace:\n\t <TASK>\n\t __dump_stack lib/dump_stack.c:88 [inline]\n\t dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n\t print_unlock_imbalance_bug include/trace/events/lock.h:58 [inline]\n\t __lock_release kernel/locking/lockdep.c:5306 [inline]\n\t lock_release.cold+0x49/0x4e kernel/locking/lockdep.c:5657\n\t __mutex_unlock_slowpath+0x99/0x5e0 kernel/locking/mutex.c:900\n\t rxrpc_do_sendmsg+0xc13/0x1350 net/rxrpc/sendmsg.c:748\n\t rxrpc_sendmsg+0x420/0x630 net/rxrpc/af_rxrpc.c:561\n\t sock_sendmsg_nosec net/socket.c:704 [inline]\n\t sock_sendmsg+0xcf/0x120 net/socket.c:724\n\t ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409\n\t ___sys_sendmsg+0xf3/0x170 net/socket.c:2463\n\t __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492\n\t do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n\t do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n\t entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n[Thanks to Hawkins Jiawei and Khalid Masum for their attempts to fix this]",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "known_affected": [
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2022-49998"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/091dc91e119fdd61432347231724f4e861c6b465",
          "url": "https://git.kernel.org/stable/c/091dc91e119fdd61432347231724f4e861c6b465"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/2bc769b8edb158be7379d15f36e23d66cf850053",
          "url": "https://git.kernel.org/stable/c/2bc769b8edb158be7379d15f36e23d66cf850053"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/79e2ca7aa96e80961828ab6312264633b66183cc",
          "url": "https://git.kernel.org/stable/c/79e2ca7aa96e80961828ab6312264633b66183cc"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/b0f571ecd7943423c25947439045f0d352ca3dbf",
          "url": "https://git.kernel.org/stable/c/b0f571ecd7943423c25947439045f0d352ca3dbf"
        }
      ],
      "release_date": "2025-06-18T11:00:57Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-05T12:17:51.531590Z",
          "details": "This issue is confined to the AF_RXRPC sendmsg path and is only reachable when the rxrpc/AFS stack is present and an AF_RXRPC socket is exercised; the module is not active by default and is typically enabled only if AFS/RxRPC is explicitly configured. It is a local‑only condition with low attack complexity and low required privileges that impacts availability (lock/mutex imbalance leading to WARN/Oops) without confidentiality or integrity effects. In centrally managed server and cloud VM environments that do not deploy AFS/RxRPC or grant shell access to untrusted users, the practical exposure and blast radius are minimal, so this can be safely deprioritized.",
          "product_ids": [
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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}