CVE-2022-49977 (GCVE-0-2022-49977)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:00 – Updated: 2025-12-23 13:26
VLAI?
Title
ftrace: Fix NULL pointer dereference in is_ftrace_trampoline when ftrace is dead
Summary
In the Linux kernel, the following vulnerability has been resolved: ftrace: Fix NULL pointer dereference in is_ftrace_trampoline when ftrace is dead ftrace_startup does not remove ops from ftrace_ops_list when ftrace_startup_enable fails: register_ftrace_function ftrace_startup __register_ftrace_function ... add_ftrace_ops(&ftrace_ops_list, ops) ... ... ftrace_startup_enable // if ftrace failed to modify, ftrace_disabled is set to 1 ... return 0 // ops is in the ftrace_ops_list. When ftrace_disabled = 1, unregister_ftrace_function simply returns without doing anything: unregister_ftrace_function ftrace_shutdown if (unlikely(ftrace_disabled)) return -ENODEV; // return here, __unregister_ftrace_function is not executed, // as a result, ops is still in the ftrace_ops_list __unregister_ftrace_function ... If ops is dynamically allocated, it will be free later, in this case, is_ftrace_trampoline accesses NULL pointer: is_ftrace_trampoline ftrace_ops_trampoline do_for_each_ftrace_op(op, ftrace_ops_list) // OOPS! op may be NULL! Syzkaller reports as follows: [ 1203.506103] BUG: kernel NULL pointer dereference, address: 000000000000010b [ 1203.508039] #PF: supervisor read access in kernel mode [ 1203.508798] #PF: error_code(0x0000) - not-present page [ 1203.509558] PGD 800000011660b067 P4D 800000011660b067 PUD 130fb8067 PMD 0 [ 1203.510560] Oops: 0000 [#1] SMP KASAN PTI [ 1203.511189] CPU: 6 PID: 29532 Comm: syz-executor.2 Tainted: G B W 5.10.0 #8 [ 1203.512324] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 1203.513895] RIP: 0010:is_ftrace_trampoline+0x26/0xb0 [ 1203.514644] Code: ff eb d3 90 41 55 41 54 49 89 fc 55 53 e8 f2 00 fd ff 48 8b 1d 3b 35 5d 03 e8 e6 00 fd ff 48 8d bb 90 00 00 00 e8 2a 81 26 00 <48> 8b ab 90 00 00 00 48 85 ed 74 1d e8 c9 00 fd ff 48 8d bb 98 00 [ 1203.518838] RSP: 0018:ffffc900012cf960 EFLAGS: 00010246 [ 1203.520092] RAX: 0000000000000000 RBX: 000000000000007b RCX: ffffffff8a331866 [ 1203.521469] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 000000000000010b [ 1203.522583] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8df18b07 [ 1203.523550] R10: fffffbfff1be3160 R11: 0000000000000001 R12: 0000000000478399 [ 1203.524596] R13: 0000000000000000 R14: ffff888145088000 R15: 0000000000000008 [ 1203.525634] FS: 00007f429f5f4700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000 [ 1203.526801] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1203.527626] CR2: 000000000000010b CR3: 0000000170e1e001 CR4: 00000000003706e0 [ 1203.528611] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1203.529605] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Therefore, when ftrace_startup_enable fails, we need to rollback registration process and remove ops from ftrace_ops_list.
Severity ?
No CVSS data available.
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: 8a56d7761d2d041ae5e8215d20b4167d8aa93f51 , < 8569b4ada1e0b9bfaa125bd0c0967918b6560fa2 (git)
Affected: 8a56d7761d2d041ae5e8215d20b4167d8aa93f51 , < 4c34a2a6c9927c239dd2e295a03d49b37b618d2c (git)
Affected: 8a56d7761d2d041ae5e8215d20b4167d8aa93f51 , < ddffe882d74ef43a3494f0ab0c24baf076c45f96 (git)
Affected: 8a56d7761d2d041ae5e8215d20b4167d8aa93f51 , < 934e49f7d696afdae9f979abe3f308408184e17b (git)
Affected: 8a56d7761d2d041ae5e8215d20b4167d8aa93f51 , < dbd8c8fc60480e3faa3ae7e27ebe03371ecd1b77 (git)
Affected: 8a56d7761d2d041ae5e8215d20b4167d8aa93f51 , < e4ae97295984ff1b9b340ed18ae1b066f36b7835 (git)
Affected: 8a56d7761d2d041ae5e8215d20b4167d8aa93f51 , < d81bd6671f45fde4c3ac7fd7733c6e3082ae9d8e (git)
Affected: 8a56d7761d2d041ae5e8215d20b4167d8aa93f51 , < c3b0f72e805f0801f05fa2aa52011c4bfc694c44 (git)
Affected: 969a08e9048ddd0d655a19e692673cdb95116ce6 (git)
Affected: 51d351d5b949ae7204696ada7ef502ed34d34fb0 (git)
Affected: 2940c25bec92f40a3f7f32504b8ea115d1701892 (git)
Affected: 189f4e672fc1c086f78818affc810ef29dda42a3 (git)
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    Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 4.9.327 , ≤ 4.9.* (semver)
Unaffected: 4.14.292 , ≤ 4.14.* (semver)
Unaffected: 4.19.257 , ≤ 4.19.* (semver)
Unaffected: 5.4.212 , ≤ 5.4.* (semver)
Unaffected: 5.10.141 , ≤ 5.10.* (semver)
Unaffected: 5.15.65 , ≤ 5.15.* (semver)
Unaffected: 5.19.7 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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Show details on NVD website

{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Fix NULL pointer dereference in is_ftrace_trampoline when ftrace is dead\n\nftrace_startup does not remove ops from ftrace_ops_list when\nftrace_startup_enable fails:\n\nregister_ftrace_function\n  ftrace_startup\n    __register_ftrace_function\n      ...\n      add_ftrace_ops(\u0026ftrace_ops_list, ops)\n      ...\n    ...\n    ftrace_startup_enable // if ftrace failed to modify, ftrace_disabled is set to 1\n    ...\n  return 0 // ops is in the ftrace_ops_list.\n\nWhen ftrace_disabled = 1, unregister_ftrace_function simply returns without doing anything:\nunregister_ftrace_function\n  ftrace_shutdown\n    if (unlikely(ftrace_disabled))\n            return -ENODEV;  // return here, __unregister_ftrace_function is not executed,\n                             // as a result, ops is still in the ftrace_ops_list\n    __unregister_ftrace_function\n    ...\n\nIf ops is dynamically allocated, it will be free later, in this case,\nis_ftrace_trampoline accesses NULL pointer:\n\nis_ftrace_trampoline\n  ftrace_ops_trampoline\n    do_for_each_ftrace_op(op, ftrace_ops_list) // OOPS! op may be NULL!\n\nSyzkaller reports as follows:\n[ 1203.506103] BUG: kernel NULL pointer dereference, address: 000000000000010b\n[ 1203.508039] #PF: supervisor read access in kernel mode\n[ 1203.508798] #PF: error_code(0x0000) - not-present page\n[ 1203.509558] PGD 800000011660b067 P4D 800000011660b067 PUD 130fb8067 PMD 0\n[ 1203.510560] Oops: 0000 [#1] SMP KASAN PTI\n[ 1203.511189] CPU: 6 PID: 29532 Comm: syz-executor.2 Tainted: G    B   W         5.10.0 #8\n[ 1203.512324] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n[ 1203.513895] RIP: 0010:is_ftrace_trampoline+0x26/0xb0\n[ 1203.514644] Code: ff eb d3 90 41 55 41 54 49 89 fc 55 53 e8 f2 00 fd ff 48 8b 1d 3b 35 5d 03 e8 e6 00 fd ff 48 8d bb 90 00 00 00 e8 2a 81 26 00 \u003c48\u003e 8b ab 90 00 00 00 48 85 ed 74 1d e8 c9 00 fd ff 48 8d bb 98 00\n[ 1203.518838] RSP: 0018:ffffc900012cf960 EFLAGS: 00010246\n[ 1203.520092] RAX: 0000000000000000 RBX: 000000000000007b RCX: ffffffff8a331866\n[ 1203.521469] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 000000000000010b\n[ 1203.522583] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8df18b07\n[ 1203.523550] R10: fffffbfff1be3160 R11: 0000000000000001 R12: 0000000000478399\n[ 1203.524596] R13: 0000000000000000 R14: ffff888145088000 R15: 0000000000000008\n[ 1203.525634] FS:  00007f429f5f4700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000\n[ 1203.526801] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 1203.527626] CR2: 000000000000010b CR3: 0000000170e1e001 CR4: 00000000003706e0\n[ 1203.528611] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 1203.529605] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n\nTherefore, when ftrace_startup_enable fails, we need to rollback registration\nprocess and remove ops from ftrace_ops_list."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-23T13:26:15.919Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8569b4ada1e0b9bfaa125bd0c0967918b6560fa2"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c34a2a6c9927c239dd2e295a03d49b37b618d2c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ddffe882d74ef43a3494f0ab0c24baf076c45f96"
        },
        {
          "url": "https://git.kernel.org/stable/c/934e49f7d696afdae9f979abe3f308408184e17b"
        },
        {
          "url": "https://git.kernel.org/stable/c/dbd8c8fc60480e3faa3ae7e27ebe03371ecd1b77"
        },
        {
          "url": "https://git.kernel.org/stable/c/e4ae97295984ff1b9b340ed18ae1b066f36b7835"
        },
        {
          "url": "https://git.kernel.org/stable/c/d81bd6671f45fde4c3ac7fd7733c6e3082ae9d8e"
        },
        {
          "url": "https://git.kernel.org/stable/c/c3b0f72e805f0801f05fa2aa52011c4bfc694c44"
        }
      ],
      "title": "ftrace: Fix NULL pointer dereference in is_ftrace_trampoline when ftrace is dead",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49977",
    "datePublished": "2025-06-18T11:00:39.871Z",
    "dateReserved": "2025-06-18T10:57:27.385Z",
    "dateUpdated": "2025-12-23T13:26:15.919Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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