{
  "cveId": "CVE-2022-49402",
  "url": "https://patchblox.com/security/cve/CVE-2022-49402",
  "summary": "CVE-2022-49402 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49402, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ftrace: Clean up hash direct_functions on regist...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ftrace: Clean up hash direct_functions on register failures  We see the following GPF when register_ftrace_direct fails:  [ ] general protection fault, probably for non-canonical address \\   0x200000000000010: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC PTI [...] [ ] RIP: 0010:ftrace_find_rec_direct\u002B0x53/0x70 [ ] Code: 48 c1 e0 03 48 03 42 08 48 8b 10 31 c0 48 85 d2 74 [...] [ ] RSP: 0018:ffffc9000138bc10 EFLAGS: 00010206 [ ] RAX: 0000000000000000 RBX: ffffffff813e0df0 RCX: 000000000000003b [ ] RDX: 0200000000000000 RSI: 000000000000000c RDI: ffffffff813e0df0 [ ] RBP: ffffffffa00a3000 R08: ffffffff81180ce0 R09: 0000000000000001 [ ] R10: ffffc9000138bc18 R11: 0000000000000001 R12: ffffffff813e0df0 [ ] R13: ffffffff813e0df0 R14: ffff888171b56400 R15: 0000000000000000 [ ] FS:  00007fa9420c7780(0000) GS:ffff888ff6a00000(0000) knlGS:000000000 [ ] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ ] CR2: 000000000770d000 CR3: 0000000107d50003 CR4: 0000000000370ee0 [ ] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ ] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ ] Call Trace: [ ]  \u003CTASK\u003E [ ]  register_ftrace_direct\u002B0x54/0x290 [ ]  ? render_sigset_t\u002B0xa0/0xa0 [ ]  bpf_trampoline_update\u002B0x3f5/0x4a0 [ ]  ? 0xffffffffa00a3000 [ ]  bpf_trampoline_link_prog\u002B0xa9/0x140 [ ]  bpf_tracing_prog_attach\u002B0x1dc/0x450 [ ]  bpf_raw_tracepoint_open\u002B0x9a/0x1e0 [ ]  ? find_held_lock\u002B0x2d/0x90 [ ]  ? lock_release\u002B0x150/0x430 [ ]  __sys_bpf\u002B0xbd6/0x2700 [ ]  ? lock_is_held_type\u002B0xd8/0x130 [ ]  __x64_sys_bpf\u002B0x1c/0x20 [ ]  do_syscall_64\u002B0x3a/0x80 [ ]  entry_SYSCALL_64_after_hwframe\u002B0x44/0xae [ ] RIP: 0033:0x7fa9421defa9 [ ] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 9 f8 [...] [ ] RSP: 002b:00007ffed743bd78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ ] RAX: ffffffffffffffda RBX: 00000000069d2480 RCX: 00007fa9421defa9 [ ] RDX: 0000000000000078 RSI: 00007ffed743bd80 RDI: 0000000000000011 [ ] RBP: 00007ffed743be00 R08: 0000000000bb7270 R09: 0000000000000000 [ ] R10: 00000000069da210 R11: 0000000000000246 R12: 0000000000000001 [ ] R13: 00007ffed743c4b0 R14: 00000000069d2480 R15: 0000000000000001 [ ]  \u003C/TASK\u003E [ ] Modules linked in: klp_vm(OK) [ ] ---[ end trace 0000000000000000 ]---  One way to trigger this is:   1. load a livepatch that patches kernel function xxx;   2. run bpftrace -e \u0027kfunc:xxx {}\u0027, this will fail (expected for now);   3. repeat #2 =\u003E gpf.  This is because the entry is added to direct_functions, but not removed. Fix this by remove the entry from direct_functions when register_ftrace_direct fails.  Also remove the last trailing space from ftrace.c, so we don\u0027t have to worry about it anymore.",
  "published": "2025-02-26T07:01:16Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00281,
  "epssPercentile": 0.20672,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.18.5-1",
      "fix": "DEBIAN-CVE-2022-49402",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49402",
      "released": "2025-02-26T07:01:16Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.18.5-1",
      "fix": "DEBIAN-CVE-2022-49402",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49402",
      "released": "2025-02-26T07:01:16Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.18.5-1",
      "fix": "DEBIAN-CVE-2022-49402",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49402",
      "released": "2025-02-26T07:01:16Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}