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EUVD-2026-344823

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 07:58

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T07:58:13.182542+00:00",
  "id": "EUVD-2026-344823"
}

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

Vulnerability from cvelistv5 – Published: 2025-06-18 11:00 – Updated: 2026-08-05 08:56

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

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/8569b4ada1e0b9bfa…
https://git.kernel.org/stable/c/4c34a2a6c9927c239…
https://git.kernel.org/stable/c/ddffe882d74ef43a3…
https://git.kernel.org/stable/c/934e49f7d696afdae…
https://git.kernel.org/stable/c/dbd8c8fc60480e3fa…
https://git.kernel.org/stable/c/e4ae97295984ff1b9…
https://git.kernel.org/stable/c/d81bd6671f45fde4c…
https://git.kernel.org/stable/c/c3b0f72e805f0801f…

Impacted products

2 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) Affected: 3.2.54 , < 3.3 (semver) Affected: 3.4.72 , < 3.5 (semver) Affected: 3.10.22 , < 3.11 (semver) Affected: 3.12.3 , < 3.13 (semver)
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)

Show details on NVD website

JSON

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{
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              "version": "5.19.7",
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              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached through local ftrace registration paths (tracefs function tracer/instances/set_ftrace_filter probes, or perf_event_open function tracing) that call register_ftrace_function \u2192 ftrace_startup; there is no network or adjacent-protocol entry point.\nAC:L - An attacker who can drive ftrace registration fully controls creating dynamic ops, forcing the ftrace_startup_enable failure/disable window (as syzkaller did), ignoring failed unregister, and freeing the ops, then triggering is_ftrace_trampoline via stack unwind; success is not left to uncontrolled third-party state.\nPR:L - Worst reasonable deployments grant TRACE_MODE_WRITE (0640) via tracefs gid=tracing (Android atrace/perfetto, ChromeOS) or CAP_PERFMON for function tracing; these are delegatable low privileges, not init-namespace root, and are not obtainable only via full CAP_SYS_ADMIN.\nUI:N - The attacker creates instances/enables the function tracer (or opens a perf ftrace event), triggers the dead-ftrace register/unregister/free sequence, and causes stack unwinding themselves with no separate victim action.\nS:U - The dangling ftrace_ops UAF and any resulting memory corruption or oops remain inside the host kernel\u0027s privilege domain; this is not a VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - Dynamically allocated ftrace_ops remain linked on ftrace_ops_list after free, so is_ftrace_trampoline\u0027s list walk is a use-after-free that can be reclaimed/sprayed to disclose kernel memory through trampoline/next field reads.\nI:H - The same UAF of struct ftrace_ops (including func/trampoline pointers) is heap-sprayable into type confusion and control-flow hijack when list walkers consume the reclaimed object, matching CVSS guidance that exploitable UAFs are Integrity High.\nA:H - The confirmed syzkaller outcome is a kernel NULL pointer dereference oops in is_ftrace_trampoline while walking the stale ops list, which panics or takes down the system and can be re-triggered after the dangling entry is left behind."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:56:59.013Z",
        "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": "2026-08-05T08:56:59.013Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

EUVD-2026-344823

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

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