CVE-2022-49607 (GCVE-0-2022-49607)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:23 – Updated: 2025-10-01 19:36
VLAI?
Title
perf/core: Fix data race between perf_event_set_output() and perf_mmap_close()
Summary
In the Linux kernel, the following vulnerability has been resolved: perf/core: Fix data race between perf_event_set_output() and perf_mmap_close() Yang Jihing reported a race between perf_event_set_output() and perf_mmap_close(): CPU1 CPU2 perf_mmap_close(e2) if (atomic_dec_and_test(&e2->rb->mmap_count)) // 1 - > 0 detach_rest = true ioctl(e1, IOC_SET_OUTPUT, e2) perf_event_set_output(e1, e2) ... list_for_each_entry_rcu(e, &e2->rb->event_list, rb_entry) ring_buffer_attach(e, NULL); // e1 isn't yet added and // therefore not detached ring_buffer_attach(e1, e2->rb) list_add_rcu(&e1->rb_entry, &e2->rb->event_list) After this; e1 is attached to an unmapped rb and a subsequent perf_mmap() will loop forever more: again: mutex_lock(&e->mmap_mutex); if (event->rb) { ... if (!atomic_inc_not_zero(&e->rb->mmap_count)) { ... mutex_unlock(&e->mmap_mutex); goto again; } } The loop in perf_mmap_close() holds e2->mmap_mutex, while the attach in perf_event_set_output() holds e1->mmap_mutex. As such there is no serialization to avoid this race. Change perf_event_set_output() to take both e1->mmap_mutex and e2->mmap_mutex to alleviate that problem. Additionally, have the loop in perf_mmap() detach the rb directly, this avoids having to wait for the concurrent perf_mmap_close() to get around to doing it to make progress.
Severity ?
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < 3bbd868099287ff9027db59029b502fcfa2202a0 (git)
Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < f836f9ac95df15f1e0af4beb0ec20021e8c91998 (git)
Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < 17f5417194136517ee9bbd6511249e5310e5617c (git)
Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < 98c3c8fd0d4c560e0f8335b79c407bbf7fc9462c (git)
Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < 43128b3eee337824158f34da6648163d2f2fb937 (git)
Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < da3c256e2d0ebc87c7db0c605c9692b6f1722074 (git)
Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < a9391ff7a7c5f113d6f2bf6621d49110950de49c (git)
Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < 68e3c69803dada336893640110cb87221bb01dcf (git)
Affected: 2487f0db30527032c4d56fc2d0b1a240fe89fef8 (git)
Affected: 703197b61d05f5edae54bad3256901c5a5c8794c (git)
Affected: c52217e88ae0f3a4ae00562d86e338f8f85969b4 (git)
Create a notification for this product.
    Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 4.9.325 , ≤ 4.9.* (semver)
Unaffected: 4.14.290 , ≤ 4.14.* (semver)
Unaffected: 4.19.254 , ≤ 4.19.* (semver)
Unaffected: 5.4.208 , ≤ 5.4.* (semver)
Unaffected: 5.10.134 , ≤ 5.10.* (semver)
Unaffected: 5.15.58 , ≤ 5.15.* (semver)
Unaffected: 5.18.15 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Fix data race between perf_event_set_output() and perf_mmap_close()\n\nYang Jihing reported a race between perf_event_set_output() and\nperf_mmap_close():\n\n\tCPU1\t\t\t\t\tCPU2\n\n\tperf_mmap_close(e2)\n\t  if (atomic_dec_and_test(\u0026e2-\u003erb-\u003emmap_count)) // 1 - \u003e 0\n\t    detach_rest = true\n\n\t\t\t\t\t\tioctl(e1, IOC_SET_OUTPUT, e2)\n\t\t\t\t\t\t  perf_event_set_output(e1, e2)\n\n\t  ...\n\t  list_for_each_entry_rcu(e, \u0026e2-\u003erb-\u003eevent_list, rb_entry)\n\t    ring_buffer_attach(e, NULL);\n\t    // e1 isn\u0027t yet added and\n\t    // therefore not detached\n\n\t\t\t\t\t\t    ring_buffer_attach(e1, e2-\u003erb)\n\t\t\t\t\t\t      list_add_rcu(\u0026e1-\u003erb_entry,\n\t\t\t\t\t\t\t\t   \u0026e2-\u003erb-\u003eevent_list)\n\nAfter this; e1 is attached to an unmapped rb and a subsequent\nperf_mmap() will loop forever more:\n\n\tagain:\n\t\tmutex_lock(\u0026e-\u003emmap_mutex);\n\t\tif (event-\u003erb) {\n\t\t\t...\n\t\t\tif (!atomic_inc_not_zero(\u0026e-\u003erb-\u003emmap_count)) {\n\t\t\t\t...\n\t\t\t\tmutex_unlock(\u0026e-\u003emmap_mutex);\n\t\t\t\tgoto again;\n\t\t\t}\n\t\t}\n\nThe loop in perf_mmap_close() holds e2-\u003emmap_mutex, while the attach\nin perf_event_set_output() holds e1-\u003emmap_mutex. As such there is no\nserialization to avoid this race.\n\nChange perf_event_set_output() to take both e1-\u003emmap_mutex and\ne2-\u003emmap_mutex to alleviate that problem. Additionally, have the loop\nin perf_mmap() detach the rb directly, this avoids having to wait for\nthe concurrent perf_mmap_close() to get around to doing it to make\nprogress."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49607",
    "datePublished": "2025-02-26T02:23:31.823Z",
    "dateReserved": "2025-02-26T02:21:30.417Z",
    "dateUpdated": "2025-10-01T19:36:51.711Z",
    "state": "PUBLISHED"
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      "containers": "{\"cna\": {\"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:44:58.322Z\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nperf/core: Fix data race between perf_event_set_output() and perf_mmap_close()\\n\\nYang Jihing reported a race between perf_event_set_output() and\\nperf_mmap_close():\\n\\n\\tCPU1\\t\\t\\t\\t\\tCPU2\\n\\n\\tperf_mmap_close(e2)\\n\\t  if (atomic_dec_and_test(\u0026e2-\u003erb-\u003emmap_count)) // 1 - \u003e 0\\n\\t    detach_rest = true\\n\\n\\t\\t\\t\\t\\t\\tioctl(e1, IOC_SET_OUTPUT, e2)\\n\\t\\t\\t\\t\\t\\t  perf_event_set_output(e1, e2)\\n\\n\\t  ...\\n\\t  list_for_each_entry_rcu(e, \u0026e2-\u003erb-\u003eevent_list, rb_entry)\\n\\t    ring_buffer_attach(e, NULL);\\n\\t    // e1 isn\u0027t yet added and\\n\\t    // therefore not detached\\n\\n\\t\\t\\t\\t\\t\\t    ring_buffer_attach(e1, e2-\u003erb)\\n\\t\\t\\t\\t\\t\\t      list_add_rcu(\u0026e1-\u003erb_entry,\\n\\t\\t\\t\\t\\t\\t\\t\\t   \u0026e2-\u003erb-\u003eevent_list)\\n\\nAfter this; e1 is attached to an unmapped rb and a subsequent\\nperf_mmap() will loop forever more:\\n\\n\\tagain:\\n\\t\\tmutex_lock(\u0026e-\u003emmap_mutex);\\n\\t\\tif (event-\u003erb) {\\n\\t\\t\\t...\\n\\t\\t\\tif (!atomic_inc_not_zero(\u0026e-\u003erb-\u003emmap_count)) {\\n\\t\\t\\t\\t...\\n\\t\\t\\t\\tmutex_unlock(\u0026e-\u003emmap_mutex);\\n\\t\\t\\t\\tgoto again;\\n\\t\\t\\t}\\n\\t\\t}\\n\\nThe loop in perf_mmap_close() holds e2-\u003emmap_mutex, while the attach\\nin perf_event_set_output() holds e1-\u003emmap_mutex. As such there is no\\nserialization to avoid this race.\\n\\nChange perf_event_set_output() to take both e1-\u003emmap_mutex and\\ne2-\u003emmap_mutex to alleviate that problem. Additionally, have the loop\\nin perf_mmap() detach the rb directly, this avoids having to wait for\\nthe concurrent perf_mmap_close() to get around to doing it to make\\nprogress.\"}], \"affected\": [{\"product\": \"Linux\", \"vendor\": \"Linux\", \"defaultStatus\": \"unaffected\", \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"programFiles\": [\"kernel/events/core.c\"], \"versions\": [{\"version\": \"9bb5d40cd93c9dd4be74834b1dcb1ba03629716b\", \"lessThan\": \"3bbd868099287ff9027db59029b502fcfa2202a0\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"9bb5d40cd93c9dd4be74834b1dcb1ba03629716b\", \"lessThan\": \"f836f9ac95df15f1e0af4beb0ec20021e8c91998\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"9bb5d40cd93c9dd4be74834b1dcb1ba03629716b\", \"lessThan\": \"17f5417194136517ee9bbd6511249e5310e5617c\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": 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\"5.4.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"5.10.134\", \"lessThanOrEqual\": \"5.10.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"5.15.58\", \"lessThanOrEqual\": \"5.15.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"5.18.15\", \"lessThanOrEqual\": \"5.18.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"5.19\", \"lessThanOrEqual\": \"*\", \"status\": \"unaffected\", \"versionType\": \"original_commit_for_fix\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"3.10\", \"versionEndExcluding\": \"4.9.325\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"3.10\", \"versionEndExcluding\": \"4.14.290\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"3.10\", \"versionEndExcluding\": \"4.19.254\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"3.10\", \"versionEndExcluding\": \"5.4.208\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"3.10\", \"versionEndExcluding\": \"5.10.134\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"3.10\", \"versionEndExcluding\": \"5.15.58\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"3.10\", \"versionEndExcluding\": \"5.18.15\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"3.10\", \"versionEndExcluding\": \"5.19\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"3.2.49\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"3.4.52\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"3.9.8\"}]}]}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3bbd868099287ff9027db59029b502fcfa2202a0\"}, {\"url\": \"https://git.kernel.org/stable/c/f836f9ac95df15f1e0af4beb0ec20021e8c91998\"}, {\"url\": \"https://git.kernel.org/stable/c/17f5417194136517ee9bbd6511249e5310e5617c\"}, {\"url\": \"https://git.kernel.org/stable/c/98c3c8fd0d4c560e0f8335b79c407bbf7fc9462c\"}, {\"url\": \"https://git.kernel.org/stable/c/43128b3eee337824158f34da6648163d2f2fb937\"}, {\"url\": \"https://git.kernel.org/stable/c/da3c256e2d0ebc87c7db0c605c9692b6f1722074\"}, {\"url\": \"https://git.kernel.org/stable/c/a9391ff7a7c5f113d6f2bf6621d49110950de49c\"}, {\"url\": \"https://git.kernel.org/stable/c/68e3c69803dada336893640110cb87221bb01dcf\"}], \"title\": \"perf/core: Fix data race between perf_event_set_output() and perf_mmap_close()\", \"x_generator\": {\"engine\": \"bippy-1.2.0\"}}, \"adp\": [{\"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 4.7, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49607\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T19:35:03.904350Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-362\", \"description\": \"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)\"}]}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2025-10-01T16:51:33.352Z\"}, \"title\": \"CISA ADP Vulnrichment\"}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49607\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Linux\", \"dateReserved\": \"2025-02-26T02:21:30.417Z\", \"datePublished\": \"2025-02-26T02:23:31.823Z\", \"dateUpdated\": \"2025-05-04T12:44:58.322Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

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.