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CVE-2022-49568 (GCVE-0-2022-49568)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:23 – Updated: 2026-05-11 19:02
VLAI
Title
KVM: Don't null dereference ops->destroy
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: Don't null dereference ops->destroy A KVM device cleanup happens in either of two callbacks: 1) destroy() which is called when the VM is being destroyed; 2) release() which is called when a device fd is closed. Most KVM devices use 1) but Book3s's interrupt controller KVM devices (XICS, XIVE, XIVE-native) use 2) as they need to close and reopen during the machine execution. The error handling in kvm_ioctl_create_device() assumes destroy() is always defined which leads to NULL dereference as discovered by Syzkaller. This adds a checks for destroy!=NULL and adds a missing release(). This is not changing kvm_destroy_devices() as devices with defined release() should have been removed from the KVM devices list by then.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:36 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 852b6d57dc7fa378019786fa84727036e56839ea , < 170465715a60cbb7876e6b961b21bd3225469da8 (git)
Affected: 852b6d57dc7fa378019786fa84727036e56839ea , < 3616776bc51cd3262bb1be60cc01c72e0a1959cf (git)
Affected: 852b6d57dc7fa378019786fa84727036e56839ea , < e91665fbbf3ccb268b268a7d71a6513538d813ac (git)
Affected: 852b6d57dc7fa378019786fa84727036e56839ea , < d4a5a79b780891c5cbdfdc6124d46fdf8d13dba1 (git)
Affected: 852b6d57dc7fa378019786fa84727036e56839ea , < e8bc2427018826e02add7b0ed0fc625a60390ae5 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 5.4.210 , ≤ 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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    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49568\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T19:36:56.420307Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T16:50:14.176Z\"}}], \"cna\": {\"title\": \"KVM: Don\u0027t null dereference ops-\u003edestroy\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"852b6d57dc7fa378019786fa84727036e56839ea\", \"lessThan\": \"170465715a60cbb7876e6b961b21bd3225469da8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"852b6d57dc7fa378019786fa84727036e56839ea\", \"lessThan\": \"3616776bc51cd3262bb1be60cc01c72e0a1959cf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"852b6d57dc7fa378019786fa84727036e56839ea\", \"lessThan\": \"e91665fbbf3ccb268b268a7d71a6513538d813ac\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"852b6d57dc7fa378019786fa84727036e56839ea\", \"lessThan\": \"d4a5a79b780891c5cbdfdc6124d46fdf8d13dba1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"852b6d57dc7fa378019786fa84727036e56839ea\", \"lessThan\": \"e8bc2427018826e02add7b0ed0fc625a60390ae5\", \"versionType\": \"git\"}], \"programFiles\": [\"virt/kvm/kvm_main.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.10\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.210\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.134\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.58\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.18.15\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.18.*\"}, {\"status\": \"unaffected\", \"version\": \"5.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"virt/kvm/kvm_main.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/170465715a60cbb7876e6b961b21bd3225469da8\"}, {\"url\": \"https://git.kernel.org/stable/c/3616776bc51cd3262bb1be60cc01c72e0a1959cf\"}, {\"url\": \"https://git.kernel.org/stable/c/e91665fbbf3ccb268b268a7d71a6513538d813ac\"}, {\"url\": \"https://git.kernel.org/stable/c/d4a5a79b780891c5cbdfdc6124d46fdf8d13dba1\"}, {\"url\": \"https://git.kernel.org/stable/c/e8bc2427018826e02add7b0ed0fc625a60390ae5\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: Don\u0027t null dereference ops-\u003edestroy\\n\\nA KVM device cleanup happens in either of two callbacks:\\n1) destroy() which is called when the VM is being destroyed;\\n2) release() which is called when a device fd is closed.\\n\\nMost KVM devices use 1) but Book3s\u0027s interrupt controller KVM devices\\n(XICS, XIVE, XIVE-native) use 2) as they need to close and reopen during\\nthe machine execution. The error handling in kvm_ioctl_create_device()\\nassumes destroy() is always defined which leads to NULL dereference as\\ndiscovered by Syzkaller.\\n\\nThis adds a checks for destroy!=NULL and adds a missing release().\\n\\nThis is not changing kvm_destroy_devices() as devices with defined\\nrelease() should have been removed from the KVM devices list by then.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.210\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.134\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.58\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18.15\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19\", \"versionStartIncluding\": \"3.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T19:02:28.088Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49568\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T19:02:28.088Z\", \"dateReserved\": \"2025-02-26T02:21:30.410Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T02:23:12.722Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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.