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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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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: tcp_rtx_synack() can be called from process context\n\nLaurent reported the enclosed report [1]\n\nThis bug triggers with following coditions:\n\n0) Kernel built with CONFIG_DEBUG_PREEMPT=y\n\n1) A new passive FastOpen TCP socket is created.\n   This FO socket waits for an ACK coming from client to be a complete\n   ESTABLISHED one.\n2) A socket operation on this socket goes through lock_sock()\n   release_sock() dance.\n3) While the socket is owned by the user in step 2),\n   a retransmit of the SYN is received and stored in socket backlog.\n4) At release_sock() time, the socket backlog is processed while\n   in process context.\n5) A SYNACK packet is cooked in response of the SYN retransmit.\n6) -> tcp_rtx_synack() is called in process context.\n\nBefore blamed commit, tcp_rtx_synack() was always called from BH handler,\nfrom a timer handler.\n\nFix this by using TCP_INC_STATS() & NET_INC_STATS()\nwhich do not assume caller is in non preemptible context.\n\n[1]\nBUG: using __this_cpu_add() in preemptible [00000000] code: epollpep/2180\ncaller is tcp_rtx_synack.part.0+0x36/0xc0\nCPU: 10 PID: 2180 Comm: epollpep Tainted: G           OE     5.16.0-0.bpo.4-amd64 #1  Debian 5.16.12-1~bpo11+1\nHardware name: Supermicro SYS-5039MC-H8TRF/X11SCD-F, BIOS 1.7 11/23/2021\nCall Trace:\n <TASK>\n dump_stack_lvl+0x48/0x5e\n check_preemption_disabled+0xde/0xe0\n tcp_rtx_synack.part.0+0x36/0xc0\n tcp_rtx_synack+0x8d/0xa0\n ? kmem_cache_alloc+0x2e0/0x3e0\n ? apparmor_file_alloc_security+0x3b/0x1f0\n inet_rtx_syn_ack+0x16/0x30\n tcp_check_req+0x367/0x610\n tcp_rcv_state_process+0x91/0xf60\n ? get_nohz_timer_target+0x18/0x1a0\n ? lock_timer_base+0x61/0x80\n ? preempt_count_add+0x68/0xa0\n tcp_v4_do_rcv+0xbd/0x270\n __release_sock+0x6d/0xb0\n release_sock+0x2b/0x90\n sock_setsockopt+0x138/0x1140\n ? __sys_getsockname+0x7e/0xc0\n ? aa_sk_perm+0x3e/0x1a0\n __sys_setsockopt+0x198/0x1e0\n __x64_sys_setsockopt+0x21/0x30\n do_syscall_64+0x38/0xc0\n entry_SYSCALL_64_after_hwframe+0x44/0xae",
          "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": {
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2022-49372"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/0a0f7f84148445c9f02f226928803a870139d820",
          "url": "https://git.kernel.org/stable/c/0a0f7f84148445c9f02f226928803a870139d820"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/0a375c822497ed6ad6b5da0792a12a6f1af10c0b",
          "url": "https://git.kernel.org/stable/c/0a375c822497ed6ad6b5da0792a12a6f1af10c0b"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/3db889f883e65bbd3b1401279bfc1e9ed255c481",
          "url": "https://git.kernel.org/stable/c/3db889f883e65bbd3b1401279bfc1e9ed255c481"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/58bd38cbc961fd799842b7be8c5222310f04b908",
          "url": "https://git.kernel.org/stable/c/58bd38cbc961fd799842b7be8c5222310f04b908"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/88cd232146207ff1d41dededed5e77c0d4438113",
          "url": "https://git.kernel.org/stable/c/88cd232146207ff1d41dededed5e77c0d4438113"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/bdc28a8fb43cc476e33b11519235adb816ce00e8",
          "url": "https://git.kernel.org/stable/c/bdc28a8fb43cc476e33b11519235adb816ce00e8"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/c348b0f8d035fc4bdc040796889beec7218bd1b8",
          "url": "https://git.kernel.org/stable/c/c348b0f8d035fc4bdc040796889beec7218bd1b8"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/d05c2fdf8e10528bb6751bd95243e862d5402a9b",
          "url": "https://git.kernel.org/stable/c/d05c2fdf8e10528bb6751bd95243e862d5402a9b"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/d8e1bc6029acac796293310aacef7b7336f35b6a",
          "url": "https://git.kernel.org/stable/c/d8e1bc6029acac796293310aacef7b7336f35b6a"
        }
      ],
      "release_date": "2025-02-26T07:01:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-01T15:52:43.079109Z",
          "details": "This issue only manifests on kernels built with the non‑default CONFIG_DEBUG_PREEMPT=y and when server‑side TCP Fast Open is explicitly enabled and exercised, plus a narrow race where a SYN retransmit is processed during release_sock(). The impacted path only updates per‑CPU TCP/NET statistics, so there is no confidentiality or integrity impact; the worst case is an availability fault (debug assertion/panic) under those special builds. With a local‑only vector, low required privileges, and a configuration‑dependent, timing‑sensitive trigger, this is low priority for typical centrally managed VM/server environments.",
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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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}