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CVE-2022-49779 (GCVE-0-2022-49779)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:09 – Updated: 2026-05-11 19:06
VLAI
Title
kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case
Summary
In the Linux kernel, the following vulnerability has been resolved: kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case In __unregister_kprobe_top(), if the currently unregistered probe has post_handler but other child probes of the aggrprobe do not have post_handler, the post_handler of the aggrprobe is cleared. If this is a ftrace-based probe, there is a problem. In later calls to disarm_kprobe(), we will use kprobe_ftrace_ops because post_handler is NULL. But we're armed with kprobe_ipmodify_ops. This triggers a WARN in __disarm_kprobe_ftrace() and may even cause use-after-free: Failed to disarm kprobe-ftrace at kernel_clone+0x0/0x3c0 (error -2) WARNING: CPU: 5 PID: 137 at kernel/kprobes.c:1135 __disarm_kprobe_ftrace.isra.21+0xcf/0xe0 Modules linked in: testKprobe_007(-) CPU: 5 PID: 137 Comm: rmmod Not tainted 6.1.0-rc4-dirty #18 [...] Call Trace: <TASK> __disable_kprobe+0xcd/0xe0 __unregister_kprobe_top+0x12/0x150 ? mutex_lock+0xe/0x30 unregister_kprobes.part.23+0x31/0xa0 unregister_kprobe+0x32/0x40 __x64_sys_delete_module+0x15e/0x260 ? do_user_addr_fault+0x2cd/0x6b0 do_syscall_64+0x3a/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd [...] For the kprobe-on-ftrace case, we keep the post_handler setting to identify this aggrprobe armed with kprobe_ipmodify_ops. This way we can disarm it correctly.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0bc11ed5ab60c135aa764a62c02cd5ea68289de4 , < 7b0007b28dd970176f2e297c06ae63eea2447127 (git)
Affected: 0bc11ed5ab60c135aa764a62c02cd5ea68289de4 , < 7d606ae1abcc3eab5408e42444d789dc7def51b8 (git)
Affected: 0bc11ed5ab60c135aa764a62c02cd5ea68289de4 , < c49cc2c059b503e962c2f13a806c105f9b757df4 (git)
Affected: 0bc11ed5ab60c135aa764a62c02cd5ea68289de4 , < 55788ebbe8b365b4375bd56b4ba7db79d393a370 (git)
Affected: 0bc11ed5ab60c135aa764a62c02cd5ea68289de4 , < 5dd7caf0bdc5d0bae7cf9776b4d739fb09bd5ebb (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.225 , ≤ 5.4.* (semver)
Unaffected: 5.10.156 , ≤ 5.10.* (semver)
Unaffected: 5.15.80 , ≤ 5.15.* (semver)
Unaffected: 6.0.10 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:06:37.158Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/5dd7caf0bdc5d0bae7cf9776b4d739fb09bd5ebb"
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      "title": "kprobes: Skip clearing aggrprobe\u0027s post_handler in kprobe-on-ftrace case",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49779",
    "datePublished": "2025-05-01T14:09:14.445Z",
    "dateReserved": "2025-04-16T07:17:33.806Z",
    "dateUpdated": "2026-05-11T19:06:37.158Z",
    "state": "PUBLISHED"
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      "date": "2026-09-15",
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    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49779\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-01T15:16:01.080\",\"lastModified\":\"2026-06-17T05:19:07.590\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nkprobes: Skip clearing aggrprobe\u0027s post_handler in kprobe-on-ftrace case\\n\\nIn __unregister_kprobe_top(), if the currently unregistered probe has\\npost_handler but other child probes of the aggrprobe do not have\\npost_handler, the post_handler of the aggrprobe is cleared. If this is\\na ftrace-based probe, there is a problem. In later calls to\\ndisarm_kprobe(), we will use kprobe_ftrace_ops because post_handler is\\nNULL. But we\u0027re armed with kprobe_ipmodify_ops. This triggers a WARN in\\n__disarm_kprobe_ftrace() and may even cause use-after-free:\\n\\n  Failed to disarm kprobe-ftrace at kernel_clone+0x0/0x3c0 (error -2)\\n  WARNING: CPU: 5 PID: 137 at kernel/kprobes.c:1135 __disarm_kprobe_ftrace.isra.21+0xcf/0xe0\\n  Modules linked in: testKprobe_007(-)\\n  CPU: 5 PID: 137 Comm: rmmod Not tainted 6.1.0-rc4-dirty #18\\n  [...]\\n  Call Trace:\\n   \u003cTASK\u003e\\n   __disable_kprobe+0xcd/0xe0\\n   __unregister_kprobe_top+0x12/0x150\\n   ? mutex_lock+0xe/0x30\\n   unregister_kprobes.part.23+0x31/0xa0\\n   unregister_kprobe+0x32/0x40\\n   __x64_sys_delete_module+0x15e/0x260\\n   ? do_user_addr_fault+0x2cd/0x6b0\\n   do_syscall_64+0x3a/0x90\\n   entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n   [...]\\n\\nFor the kprobe-on-ftrace case, we keep the post_handler setting to\\nidentify this aggrprobe armed with kprobe_ipmodify_ops. This way we\\ncan disarm it correctly.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: kprobes: Omitir la limpieza del post_handler de aggrprobe en el caso de kprobe-on-ftrace. En __unregister_kprobe_top(), si la sonda actualmente no registrada tiene post_handler, pero otras sondas secundarias de aggrprobe no lo tienen, se limpia el post_handler de aggrprobe. Si se trata de una sonda basada en ftrace, existe un problema. En llamadas posteriores a disarm_kprobe(), usaremos kprobe_ftrace_ops porque post_handler es NULL. Pero estamos preparados con kprobe_ipmodify_ops. Esto activa una ADVERTENCIA en __disarm_kprobe_ftrace() e incluso puede provocar un use-after-free: No se pudo desarmar kprobe-ftrace en kernel_clone+0x0/0x3c0 (error -2) ADVERTENCIA: CPU: 5 PID: 137 en kernel/kprobes.c:1135 __disarm_kprobe_ftrace.isra.21+0xcf/0xe0 M\u00f3dulos vinculados en: testKprobe_007(-) CPU: 5 PID: 137 Comm: rmmod No contaminado 6.1.0-rc4-dirty #18 [...] Seguimiento de llamadas:  __disable_kprobe+0xcd/0xe0 __unregister_kprobe_top+0x12/0x150 ? mutex_lock+0xe/0x30 unregister_kprobes.part.23+0x31/0xa0 unregister_kprobe+0x32/0x40 __x64_sys_delete_module+0x15e/0x260 ? do_user_addr_fault+0x2cd/0x6b0 do_syscall_64+0x3a/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd [...] For the kprobe-on-ftrace case, we keep the post_handler setting to identify this aggrprobe armed with kprobe_ipmodify_ops. De esta forma, podemos desactivarla 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:17:34+00:00",
      "cve": "CVE-2022-49779",
      "id": "CVE-2022-49779",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kprobes: Skip clearing aggrprobe\u0027s post_handler in kprobe-on-ftrace case",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49779.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T02:25:43Z",
      "cve": "CVE-2022-49779",
      "id": "CVE-2022-49779",
      "initial_release_date": "2025-05-05T13:35:04Z",
      "product_status:known_affected": "339",
      "product_status:known_not_affected": "386",
      "product_status:recommended": "214",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49779",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49779.json",
      "version": "39"
    }
  }
}



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Detection rules are retrieved from Rulezet.


Related by attack behaviour

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.