{"id":"CVE-2022-49873","state":"PUBLISHED","title":"bpf: Fix wrong reg type conversion in release_reference()","description":"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.","publishedAt":"2025-05-01T14:10:23.128Z","updatedAt":"2026-05-11T19:08:23.688Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fd978bf7fd312581a7ca454a991f0ffb34c4204b","status":"affected","lessThan":"cedd4f01f67be94735f15123158f485028571037","versionType":"git"},{"version":"fd978bf7fd312581a7ca454a991f0ffb34c4204b","status":"affected","lessThan":"466ce46f251dfb259a8cbaa895ab9edd6fb56240","versionType":"git"},{"version":"fd978bf7fd312581a7ca454a991f0ffb34c4204b","status":"affected","lessThan":"ae5ccad6c711db0f2ca1231be051935dd128b8f5","versionType":"git"},{"version":"fd978bf7fd312581a7ca454a991f0ffb34c4204b","status":"affected","lessThan":"f1db20814af532f85e091231223e5e4818e8464b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"5.10.155","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.79","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.0.9","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]}],"references":["https://git.kernel.org/stable/c/cedd4f01f67be94735f15123158f485028571037","https://git.kernel.org/stable/c/466ce46f251dfb259a8cbaa895ab9edd6fb56240","https://git.kernel.org/stable/c/ae5ccad6c711db0f2ca1231be051935dd128b8f5","https://git.kernel.org/stable/c/f1db20814af532f85e091231223e5e4818e8464b"],"weaknesses":["CWE-704"],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49873.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49873","state":"PUBLISHED","datePublished":"2025-05-01T14:10:23.128Z","dateUpdated":"2026-05-11T19:08:23.688Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-05-01T14:05:17.238Z"},"containers":{"cna":{"title":"bpf: Fix wrong reg type conversion in release_reference()","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fd978bf7fd312581a7ca454a991f0ffb34c4204b","status":"affected","lessThan":"cedd4f01f67be94735f15123158f485028571037","versionType":"git"},{"version":"fd978bf7fd312581a7ca454a991f0ffb34c4204b","status":"affected","lessThan":"466ce46f251dfb259a8cbaa895ab9edd6fb56240","versionType":"git"},{"version":"fd978bf7fd312581a7ca454a991f0ffb34c4204b","status":"affected","lessThan":"ae5ccad6c711db0f2ca1231be051935dd128b8f5","versionType":"git"},{"version":"fd978bf7fd312581a7ca454a991f0ffb34c4204b","status":"affected","lessThan":"f1db20814af532f85e091231223e5e4818e8464b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"5.10.155","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.79","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.0.9","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:08:23.688Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.10.155"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.15.79"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.0.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"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":{"timestamp":"2025-10-01T16:03:43.287933Z","id":"CVE-2022-49873","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-704","type":"CWE","lang":"en","description":"CWE-704 Incorrect Type Conversion or Cast"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T16:03:45.940Z"}}]}}}