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CVE-2022-49873 (GCVE-0-2022-49873)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:10 – Updated: 2026-05-11 19:08
VLAI
Title
bpf: Fix wrong reg type conversion in release_reference()
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix wrong reg type conversion in release_reference() Some helper functions will allocate memory. To avoid memory leaks, the verifier requires the eBPF program to release these memories by calling the corresponding helper functions. When a resource is released, all pointer registers corresponding to the resource should be invalidated. The verifier use release_references() to do this job, by apply __mark_reg_unknown() to each relevant register. It will give these registers the type of SCALAR_VALUE. A register that will contain a pointer value at runtime, but of type SCALAR_VALUE, which may allow the unprivileged user to get a kernel pointer by storing this register into a map. Using __mark_reg_not_init() while NOT allow_ptr_leaks can mitigate this problem.
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 16:03 UTC
CWE
  • CWE-704 - Incorrect Type Conversion or Cast
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fd978bf7fd312581a7ca454a991f0ffb34c4204b , < cedd4f01f67be94735f15123158f485028571037 (git)
Affected: fd978bf7fd312581a7ca454a991f0ffb34c4204b , < 466ce46f251dfb259a8cbaa895ab9edd6fb56240 (git)
Affected: fd978bf7fd312581a7ca454a991f0ffb34c4204b , < ae5ccad6c711db0f2ca1231be051935dd128b8f5 (git)
Affected: fd978bf7fd312581a7ca454a991f0ffb34c4204b , < f1db20814af532f85e091231223e5e4818e8464b (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.10.155 , ≤ 5.10.* (semver)
Unaffected: 5.15.79 , ≤ 5.15.* (semver)
Unaffected: 6.0.9 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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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-2022-49873\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T16:03:43.287933Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-704\", \"description\": \"CWE-704 Incorrect Type Conversion or Cast\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T14:31:25.273Z\"}}], \"cna\": {\"title\": \"bpf: Fix wrong reg type conversion in release_reference()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"fd978bf7fd312581a7ca454a991f0ffb34c4204b\", \"lessThan\": \"cedd4f01f67be94735f15123158f485028571037\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fd978bf7fd312581a7ca454a991f0ffb34c4204b\", \"lessThan\": \"466ce46f251dfb259a8cbaa895ab9edd6fb56240\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fd978bf7fd312581a7ca454a991f0ffb34c4204b\", \"lessThan\": \"ae5ccad6c711db0f2ca1231be051935dd128b8f5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fd978bf7fd312581a7ca454a991f0ffb34c4204b\", \"lessThan\": \"f1db20814af532f85e091231223e5e4818e8464b\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/bpf/verifier.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.20\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.155\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.79\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/bpf/verifier.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/cedd4f01f67be94735f15123158f485028571037\"}, {\"url\": \"https://git.kernel.org/stable/c/466ce46f251dfb259a8cbaa895ab9edd6fb56240\"}, {\"url\": \"https://git.kernel.org/stable/c/ae5ccad6c711db0f2ca1231be051935dd128b8f5\"}, {\"url\": \"https://git.kernel.org/stable/c/f1db20814af532f85e091231223e5e4818e8464b\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix wrong reg type conversion in release_reference()\\n\\nSome helper functions will allocate memory. To avoid memory leaks, the\\nverifier requires the eBPF program to release these memories by calling\\nthe corresponding helper functions.\\n\\nWhen a resource is released, all pointer registers corresponding to the\\nresource should be invalidated. The verifier use release_references() to\\ndo this job, by apply  __mark_reg_unknown() to each relevant register.\\n\\nIt will give these registers the type of SCALAR_VALUE. A register that\\nwill contain a pointer value at runtime, but of type SCALAR_VALUE, which\\nmay allow the unprivileged user to get a kernel pointer by storing this\\nregister into a map.\\n\\nUsing __mark_reg_not_init() while NOT allow_ptr_leaks can mitigate this\\nproblem.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.155\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.79\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.9\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1\", \"versionStartIncluding\": \"4.20\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T19:08:23.688Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49873\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T19:08:23.688Z\", \"dateReserved\": \"2025-05-01T14:05:17.238Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-05-01T14:10:23.128Z\", \"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.