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CVE-2022-50579 (GCVE-0-2022-50579)

Vulnerability from cvelistv5 – Published: 2025-10-22 13:23 – Updated: 2026-05-23 15:24
VLAI
Title
arm64: ftrace: fix module PLTs with mcount
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64: ftrace: fix module PLTs with mcount Li Huafei reports that mcount-based ftrace with module PLTs was broken by commit: a6253579977e4c6f ("arm64: ftrace: consistently handle PLTs.") When a module PLTs are used and a module is loaded sufficiently far away from the kernel, we'll create PLTs for any branches which are out-of-range. These are separate from the special ftrace trampoline PLTs, which the module PLT code doesn't directly manipulate. When mcount is in use this is a problem, as each mcount callsite in a module will be initialized to point to a module PLT, but since commit a6253579977e4c6f ftrace_make_nop() will assume that the callsite has been initialized to point to the special ftrace trampoline PLT, and ftrace_find_callable_addr() rejects other cases. This means that when ftrace tries to initialize a callsite via ftrace_make_nop(), the call to ftrace_find_callable_addr() will find that the `_mcount` stub is out-of-range and is not handled by the ftrace PLT, resulting in a splat: | ftrace_test: loading out-of-tree module taints kernel. | ftrace: no module PLT for _mcount | ------------[ ftrace bug ]------------ | ftrace failed to modify | [<ffff800029180014>] 0xffff800029180014 | actual: 44:00:00:94 | Initializing ftrace call sites | ftrace record flags: 2000000 | (0) | expected tramp: ffff80000802eb3c | ------------[ cut here ]------------ | WARNING: CPU: 3 PID: 157 at kernel/trace/ftrace.c:2120 ftrace_bug+0x94/0x270 | Modules linked in: | CPU: 3 PID: 157 Comm: insmod Tainted: G O 6.0.0-rc6-00151-gcd722513a189-dirty #22 | Hardware name: linux,dummy-virt (DT) | pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) | pc : ftrace_bug+0x94/0x270 | lr : ftrace_bug+0x21c/0x270 | sp : ffff80000b2bbaf0 | x29: ffff80000b2bbaf0 x28: 0000000000000000 x27: ffff0000c4d38000 | x26: 0000000000000001 x25: ffff800009d7e000 x24: ffff0000c4d86e00 | x23: 0000000002000000 x22: ffff80000a62b000 x21: ffff8000098ebea8 | x20: ffff0000c4d38000 x19: ffff80000aa24158 x18: ffffffffffffffff | x17: 0000000000000000 x16: 0a0d2d2d2d2d2d2d x15: ffff800009aa9118 | x14: 0000000000000000 x13: 6333626532303830 x12: 3030303866666666 | x11: 203a706d61727420 x10: 6465746365707865 x9 : 3362653230383030 | x8 : c0000000ffffefff x7 : 0000000000017fe8 x6 : 000000000000bff4 | x5 : 0000000000057fa8 x4 : 0000000000000000 x3 : 0000000000000001 | x2 : ad2cb14bb5438900 x1 : 0000000000000000 x0 : 0000000000000022 | Call trace: | ftrace_bug+0x94/0x270 | ftrace_process_locs+0x308/0x430 | ftrace_module_init+0x44/0x60 | load_module+0x15b4/0x1ce8 | __do_sys_init_module+0x1ec/0x238 | __arm64_sys_init_module+0x24/0x30 | invoke_syscall+0x54/0x118 | el0_svc_common.constprop.4+0x84/0x100 | do_el0_svc+0x3c/0xd0 | el0_svc+0x1c/0x50 | el0t_64_sync_handler+0x90/0xb8 | el0t_64_sync+0x15c/0x160 | ---[ end trace 0000000000000000 ]--- | ---------test_init----------- Fix this by reverting to the old behaviour of ignoring the old instruction when initialising an mcount callsite in a module, which was the behaviour prior to commit a6253579977e4c6f.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bc28fde90937a920f7714ec4408269cac744f796 , < 657de36c72f57fa172a66b06f826b3f5bc56f42e (git)
Affected: db73aa9466338ec821ed2a0b01721fe4d06876b1 , < 6c93b683cedaef745884cb9d554d02ed6266b897 (git)
Affected: a6253579977e4c6f7818eeb05bf2bc65678a7187 , < 0f77b6b2ba70d7c9d69ef39694e283ded9f8b5f2 (git)
Affected: a6253579977e4c6f7818eeb05bf2bc65678a7187 , < 985432303cf7d4804fb2c2fdfbf0466a796d68c3 (git)
Affected: a6253579977e4c6f7818eeb05bf2bc65678a7187 , < 8cfb08575c6d4585f1ce0deeb189e5c824776b04 (git)
Affected: dcecc96ed16f73417de5550f384e348c9d56f279 (git)
Affected: 5.10.124 , < 5.10.150 (semver)
Affected: 5.15.49 , < 5.15.75 (semver)
Affected: 5.18.6 , < 5.19 (semver)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 5.10.150 , ≤ 5.10.* (semver)
Unaffected: 5.15.75 , ≤ 5.15.* (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: ftrace: fix module PLTs with mcount\n\nLi Huafei reports that mcount-based ftrace with module PLTs was broken\nby commit:\n\n  a6253579977e4c6f (\"arm64: ftrace: consistently handle PLTs.\")\n\nWhen a module PLTs are used and a module is loaded sufficiently far away\nfrom the kernel, we\u0027ll create PLTs for any branches which are\nout-of-range. These are separate from the special ftrace trampoline\nPLTs, which the module PLT code doesn\u0027t directly manipulate.\n\nWhen mcount is in use this is a problem, as each mcount callsite in a\nmodule will be initialized to point to a module PLT, but since commit\na6253579977e4c6f ftrace_make_nop() will assume that the callsite has\nbeen initialized to point to the special ftrace trampoline PLT, and\nftrace_find_callable_addr() rejects other cases.\n\nThis means that when ftrace tries to initialize a callsite via\nftrace_make_nop(), the call to ftrace_find_callable_addr() will find\nthat the `_mcount` stub is out-of-range and is not handled by the ftrace\nPLT, resulting in a splat:\n\n| ftrace_test: loading out-of-tree module taints kernel.\n| ftrace: no module PLT for _mcount\n| ------------[ ftrace bug ]------------\n| ftrace failed to modify\n| [\u003cffff800029180014\u003e] 0xffff800029180014\n|  actual:   44:00:00:94\n| Initializing ftrace call sites\n| ftrace record flags: 2000000\n|  (0)\n|  expected tramp: ffff80000802eb3c\n| ------------[ cut here ]------------\n| WARNING: CPU: 3 PID: 157 at kernel/trace/ftrace.c:2120 ftrace_bug+0x94/0x270\n| Modules linked in:\n| CPU: 3 PID: 157 Comm: insmod Tainted: G           O       6.0.0-rc6-00151-gcd722513a189-dirty #22\n| Hardware name: linux,dummy-virt (DT)\n| pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n| pc : ftrace_bug+0x94/0x270\n| lr : ftrace_bug+0x21c/0x270\n| sp : ffff80000b2bbaf0\n| x29: ffff80000b2bbaf0 x28: 0000000000000000 x27: ffff0000c4d38000\n| x26: 0000000000000001 x25: ffff800009d7e000 x24: ffff0000c4d86e00\n| x23: 0000000002000000 x22: ffff80000a62b000 x21: ffff8000098ebea8\n| x20: ffff0000c4d38000 x19: ffff80000aa24158 x18: ffffffffffffffff\n| x17: 0000000000000000 x16: 0a0d2d2d2d2d2d2d x15: ffff800009aa9118\n| x14: 0000000000000000 x13: 6333626532303830 x12: 3030303866666666\n| x11: 203a706d61727420 x10: 6465746365707865 x9 : 3362653230383030\n| x8 : c0000000ffffefff x7 : 0000000000017fe8 x6 : 000000000000bff4\n| x5 : 0000000000057fa8 x4 : 0000000000000000 x3 : 0000000000000001\n| x2 : ad2cb14bb5438900 x1 : 0000000000000000 x0 : 0000000000000022\n| Call trace:\n|  ftrace_bug+0x94/0x270\n|  ftrace_process_locs+0x308/0x430\n|  ftrace_module_init+0x44/0x60\n|  load_module+0x15b4/0x1ce8\n|  __do_sys_init_module+0x1ec/0x238\n|  __arm64_sys_init_module+0x24/0x30\n|  invoke_syscall+0x54/0x118\n|  el0_svc_common.constprop.4+0x84/0x100\n|  do_el0_svc+0x3c/0xd0\n|  el0_svc+0x1c/0x50\n|  el0t_64_sync_handler+0x90/0xb8\n|  el0t_64_sync+0x15c/0x160\n| ---[ end trace 0000000000000000 ]---\n| ---------test_init-----------\n\nFix this by reverting to the old behaviour of ignoring the old\ninstruction when initialising an mcount callsite in a module, which was\nthe behaviour prior to commit a6253579977e4c6f."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:24:47.340Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/657de36c72f57fa172a66b06f826b3f5bc56f42e"
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          "url": "https://git.kernel.org/stable/c/6c93b683cedaef745884cb9d554d02ed6266b897"
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          "url": "https://git.kernel.org/stable/c/0f77b6b2ba70d7c9d69ef39694e283ded9f8b5f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/985432303cf7d4804fb2c2fdfbf0466a796d68c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/8cfb08575c6d4585f1ce0deeb189e5c824776b04"
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      ],
      "title": "arm64: ftrace: fix module PLTs with mcount",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50579",
    "datePublished": "2025-10-22T13:23:32.242Z",
    "dateReserved": "2025-10-22T13:20:23.762Z",
    "dateUpdated": "2026-05-23T15:24:47.340Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-50579",
      "date": "2026-09-17",
      "epss": "0.00199",
      "percentile": "0.10014"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50579\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-22T14:15:42.927\",\"lastModified\":\"2026-06-17T05:23:49.693\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\narm64: ftrace: fix module PLTs with mcount\\n\\nLi Huafei reports that mcount-based ftrace with module PLTs was broken\\nby commit:\\n\\n  a6253579977e4c6f (\\\"arm64: ftrace: consistently handle PLTs.\\\")\\n\\nWhen a module PLTs are used and a module is loaded sufficiently far away\\nfrom the kernel, we\u0027ll create PLTs for any branches which are\\nout-of-range. These are separate from the special ftrace trampoline\\nPLTs, which the module PLT code doesn\u0027t directly manipulate.\\n\\nWhen mcount is in use this is a problem, as each mcount callsite in a\\nmodule will be initialized to point to a module PLT, but since commit\\na6253579977e4c6f ftrace_make_nop() will assume that the callsite has\\nbeen initialized to point to the special ftrace trampoline PLT, and\\nftrace_find_callable_addr() rejects other cases.\\n\\nThis means that when ftrace tries to initialize a callsite via\\nftrace_make_nop(), the call to ftrace_find_callable_addr() will find\\nthat the `_mcount` stub is out-of-range and is not handled by the ftrace\\nPLT, resulting in a splat:\\n\\n| ftrace_test: loading out-of-tree module taints kernel.\\n| ftrace: no module PLT for _mcount\\n| ------------[ ftrace bug ]------------\\n| ftrace failed to modify\\n| [\u003cffff800029180014\u003e] 0xffff800029180014\\n|  actual:   44:00:00:94\\n| Initializing ftrace call sites\\n| ftrace record flags: 2000000\\n|  (0)\\n|  expected tramp: ffff80000802eb3c\\n| ------------[ cut here ]------------\\n| WARNING: CPU: 3 PID: 157 at kernel/trace/ftrace.c:2120 ftrace_bug+0x94/0x270\\n| Modules linked in:\\n| CPU: 3 PID: 157 Comm: insmod Tainted: G           O       6.0.0-rc6-00151-gcd722513a189-dirty #22\\n| Hardware name: linux,dummy-virt (DT)\\n| pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\\n| pc : ftrace_bug+0x94/0x270\\n| lr : ftrace_bug+0x21c/0x270\\n| sp : ffff80000b2bbaf0\\n| x29: ffff80000b2bbaf0 x28: 0000000000000000 x27: ffff0000c4d38000\\n| x26: 0000000000000001 x25: ffff800009d7e000 x24: ffff0000c4d86e00\\n| x23: 0000000002000000 x22: ffff80000a62b000 x21: ffff8000098ebea8\\n| x20: ffff0000c4d38000 x19: ffff80000aa24158 x18: ffffffffffffffff\\n| x17: 0000000000000000 x16: 0a0d2d2d2d2d2d2d x15: ffff800009aa9118\\n| x14: 0000000000000000 x13: 6333626532303830 x12: 3030303866666666\\n| x11: 203a706d61727420 x10: 6465746365707865 x9 : 3362653230383030\\n| x8 : c0000000ffffefff x7 : 0000000000017fe8 x6 : 000000000000bff4\\n| x5 : 0000000000057fa8 x4 : 0000000000000000 x3 : 0000000000000001\\n| x2 : ad2cb14bb5438900 x1 : 0000000000000000 x0 : 0000000000000022\\n| Call trace:\\n|  ftrace_bug+0x94/0x270\\n|  ftrace_process_locs+0x308/0x430\\n|  ftrace_module_init+0x44/0x60\\n|  load_module+0x15b4/0x1ce8\\n|  __do_sys_init_module+0x1ec/0x238\\n|  __arm64_sys_init_module+0x24/0x30\\n|  invoke_syscall+0x54/0x118\\n|  el0_svc_common.constprop.4+0x84/0x100\\n|  do_el0_svc+0x3c/0xd0\\n|  el0_svc+0x1c/0x50\\n|  el0t_64_sync_handler+0x90/0xb8\\n|  el0t_64_sync+0x15c/0x160\\n| ---[ end trace 0000000000000000 ]---\\n| ---------test_init-----------\\n\\nFix this by reverting to the old behaviour of ignoring the old\\ninstruction when initialising an mcount callsite in a module, which was\\nthe behaviour prior to commit a6253579977e4c6f.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/arm64/kernel/ftrace.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"bc28fde90937a920f7714ec4408269cac744f796\",\"lessThan\":\"657de36c72f57fa172a66b06f826b3f5bc56f42e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"db73aa9466338ec821ed2a0b01721fe4d06876b1\",\"lessThan\":\"6c93b683cedaef745884cb9d554d02ed6266b897\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a6253579977e4c6f7818eeb05bf2bc65678a7187\",\"lessThan\":\"0f77b6b2ba70d7c9d69ef39694e283ded9f8b5f2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a6253579977e4c6f7818eeb05bf2bc65678a7187\",\"lessThan\":\"985432303cf7d4804fb2c2fdfbf0466a796d68c3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a6253579977e4c6f7818eeb05bf2bc65678a7187\",\"lessThan\":\"8cfb08575c6d4585f1ce0deeb189e5c824776b04\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dcecc96ed16f73417de5550f384e348c9d56f279\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.124\",\"lessThan\":\"5.10.150\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.49\",\"lessThan\":\"5.15.75\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.18.6\",\"lessThan\":\"5.19\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/arm64/kernel/ftrace.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.150\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.75\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.19.17\",\"lessThanOrEqual\":\"5.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.0.3\",\"lessThanOrEqual\":\"6.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0f77b6b2ba70d7c9d69ef39694e283ded9f8b5f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/657de36c72f57fa172a66b06f826b3f5bc56f42e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6c93b683cedaef745884cb9d554d02ed6266b897\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8cfb08575c6d4585f1ce0deeb189e5c824776b04\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/985432303cf7d4804fb2c2fdfbf0466a796d68c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:55:04+00:00",
      "cve": "CVE-2022-50579",
      "id": "CVE-2022-50579",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: arm64: ftrace: fix module PLTs with mcount",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50579.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


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.