CVE-2024-42161 (GCVE-0-2024-42161)

Vulnerability from cvelistv5 – Published: 2024-07-30 07:47 – Updated: 2026-05-11 20:28
VLAI
Title
bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD [Changes from V1: - Use a default branch in the switch statement to initialize `val'.] GCC warns that `val' may be used uninitialized in the BPF_CRE_READ_BITFIELD macro, defined in bpf_core_read.h as: [...] unsigned long long val; \ [...] \ switch (__CORE_RELO(s, field, BYTE_SIZE)) { \ case 1: val = *(const unsigned char *)p; break; \ case 2: val = *(const unsigned short *)p; break; \ case 4: val = *(const unsigned int *)p; break; \ case 8: val = *(const unsigned long long *)p; break; \ } \ [...] val; \ } \ This patch adds a default entry in the switch statement that sets `val' to zero in order to avoid the warning, and random values to be used in case __builtin_preserve_field_info returns unexpected values for BPF_FIELD_BYTE_SIZE. Tested in bpf-next master. No regressions.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ee26dade0e3bcd8a34ae7520e373fb69365fce7a , < b694989bb13ed5f166e633faa1eb0f21c6d261a6 (git)
Affected: ee26dade0e3bcd8a34ae7520e373fb69365fce7a , < 3364c2ed1c241989847f19cf83e3db903ce689e3 (git)
Affected: ee26dade0e3bcd8a34ae7520e373fb69365fce7a , < a21d76bd0b0d39518e9a4c19f6cf7c042a974aff (git)
Affected: ee26dade0e3bcd8a34ae7520e373fb69365fce7a , < 7e5471b5efebc30dd0bc035cda86693a5c73d45f (git)
Affected: ee26dade0e3bcd8a34ae7520e373fb69365fce7a , < ff941a8449e712eaf7efca1a13bfb9afd3d99fc2 (git)
Affected: ee26dade0e3bcd8a34ae7520e373fb69365fce7a , < 009367099eb61a4fc2af44d4eb06b6b4de7de6db (git)
Create a notification for this product.
Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.222 , ≤ 5.10.* (semver)
Unaffected: 5.15.163 , ≤ 5.15.* (semver)
Unaffected: 6.1.98 , ≤ 6.1.* (semver)
Unaffected: 6.6.39 , ≤ 6.6.* (semver)
Unaffected: 6.9.9 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b694989bb13ed5f166e633faa1eb0f21c6d261a6\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/3364c2ed1c241989847f19cf83e3db903ce689e3\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/a21d76bd0b0d39518e9a4c19f6cf7c042a974aff\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/7e5471b5efebc30dd0bc035cda86693a5c73d45f\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/ff941a8449e712eaf7efca1a13bfb9afd3d99fc2\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/009367099eb61a4fc2af44d4eb06b6b4de7de6db\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T22:02:24.334Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-42161\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T16:14:52.496894Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:24.452Z\"}}], \"cna\": {\"title\": \"bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ee26dade0e3bcd8a34ae7520e373fb69365fce7a\", \"lessThan\": \"b694989bb13ed5f166e633faa1eb0f21c6d261a6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ee26dade0e3bcd8a34ae7520e373fb69365fce7a\", \"lessThan\": \"3364c2ed1c241989847f19cf83e3db903ce689e3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ee26dade0e3bcd8a34ae7520e373fb69365fce7a\", \"lessThan\": \"a21d76bd0b0d39518e9a4c19f6cf7c042a974aff\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ee26dade0e3bcd8a34ae7520e373fb69365fce7a\", \"lessThan\": \"7e5471b5efebc30dd0bc035cda86693a5c73d45f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ee26dade0e3bcd8a34ae7520e373fb69365fce7a\", \"lessThan\": \"ff941a8449e712eaf7efca1a13bfb9afd3d99fc2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ee26dade0e3bcd8a34ae7520e373fb69365fce7a\", \"lessThan\": \"009367099eb61a4fc2af44d4eb06b6b4de7de6db\", \"versionType\": \"git\"}], \"programFiles\": [\"tools/lib/bpf/bpf_core_read.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.222\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.163\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.98\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.39\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"tools/lib/bpf/bpf_core_read.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b694989bb13ed5f166e633faa1eb0f21c6d261a6\"}, {\"url\": \"https://git.kernel.org/stable/c/3364c2ed1c241989847f19cf83e3db903ce689e3\"}, {\"url\": \"https://git.kernel.org/stable/c/a21d76bd0b0d39518e9a4c19f6cf7c042a974aff\"}, {\"url\": \"https://git.kernel.org/stable/c/7e5471b5efebc30dd0bc035cda86693a5c73d45f\"}, {\"url\": \"https://git.kernel.org/stable/c/ff941a8449e712eaf7efca1a13bfb9afd3d99fc2\"}, {\"url\": \"https://git.kernel.org/stable/c/009367099eb61a4fc2af44d4eb06b6b4de7de6db\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD\\n\\n[Changes from V1:\\n - Use a default branch in the switch statement to initialize `val\u0027.]\\n\\nGCC warns that `val\u0027 may be used uninitialized in the\\nBPF_CRE_READ_BITFIELD macro, defined in bpf_core_read.h as:\\n\\n\\t[...]\\n\\tunsigned long long val;\\t\\t\\t\\t\\t\\t      \\\\\\n\\t[...]\\t\\t\\t\\t\\t\\t\\t\\t      \\\\\\n\\tswitch (__CORE_RELO(s, field, BYTE_SIZE)) {\\t\\t\\t      \\\\\\n\\tcase 1: val = *(const unsigned char *)p; break;\\t\\t\\t      \\\\\\n\\tcase 2: val = *(const unsigned short *)p; break;\\t\\t      \\\\\\n\\tcase 4: val = *(const unsigned int *)p; break;\\t\\t\\t      \\\\\\n\\tcase 8: val = *(const unsigned long long *)p; break;\\t\\t      \\\\\\n        }       \\t\\t\\t\\t\\t\\t\\t      \\\\\\n\\t[...]\\n\\tval;\\t\\t\\t\\t\\t\\t\\t\\t      \\\\\\n\\t}\\t\\t\\t\\t\\t\\t\\t\\t      \\\\\\n\\nThis patch adds a default entry in the switch statement that sets\\n`val\u0027 to zero in order to avoid the warning, and random values to be\\nused in case __builtin_preserve_field_info returns unexpected values\\nfor BPF_FIELD_BYTE_SIZE.\\n\\nTested in bpf-next master.\\nNo regressions.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.222\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.163\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.98\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.39\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.9\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"5.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T20:28:10.007Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-42161\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:28:10.007Z\", \"dateReserved\": \"2024-07-29T15:50:41.196Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-30T07:47:03.136Z\", \"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.