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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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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.