{"id":"CVE-2023-53273","state":"PUBLISHED","title":"Drivers: vmbus: Check for channel allocation before looking up relids","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nDrivers: vmbus: Check for channel allocation before looking up relids\n\nrelid2channel() assumes vmbus channel array to be allocated when called.\nHowever, in cases such as kdump/kexec, not all relids will be reset by the host.\nWhen the second kernel boots and if the guest receives a vmbus interrupt during\nvmbus driver initialization before vmbus_connect() is called, before it finishes,\nor if it fails, the vmbus interrupt service routine is called which in turn calls\nrelid2channel() and can cause a null pointer dereference.\n\nPrint a warning and error out in relid2channel() for a channel id that's invalid\nin the second kernel.","publishedAt":"2025-09-16T08:11:08.792Z","updatedAt":"2026-05-11T19:41:44.064Z","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":"8b6a877c060ed6b86878fe66c7c6493a6054cf23","status":"affected","lessThan":"176c6b4889195fbe7016d9401175b48c5c9edf68","versionType":"git"},{"version":"8b6a877c060ed6b86878fe66c7c6493a6054cf23","status":"affected","lessThan":"c373e49fbb87aa177819866ed9194ebc5414dfd6","versionType":"git"},{"version":"8b6a877c060ed6b86878fe66c7c6493a6054cf23","status":"affected","lessThan":"8c3f0ae5435fd20bb1e3a8308488aa6ac33151ee","versionType":"git"},{"version":"8b6a877c060ed6b86878fe66c7c6493a6054cf23","status":"affected","lessThan":"a5c44f3446a0565139b7d8abc78f58b86c398123","versionType":"git"},{"version":"8b6a877c060ed6b86878fe66c7c6493a6054cf23","status":"affected","lessThan":"1eb65c8687316c65140b48fad27133d583178e15","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hv/connection.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.8","versionType":"semver"},{"version":"5.10.178","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.107","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.24","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.11","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hv/connection.c"]}],"references":["https://git.kernel.org/stable/c/176c6b4889195fbe7016d9401175b48c5c9edf68","https://git.kernel.org/stable/c/c373e49fbb87aa177819866ed9194ebc5414dfd6","https://git.kernel.org/stable/c/8c3f0ae5435fd20bb1e3a8308488aa6ac33151ee","https://git.kernel.org/stable/c/a5c44f3446a0565139b7d8abc78f58b86c398123","https://git.kernel.org/stable/c/1eb65c8687316c65140b48fad27133d583178e15"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/53xxx/CVE-2023-53273.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53273","state":"PUBLISHED","datePublished":"2025-09-16T08:11:08.792Z","dateUpdated":"2026-05-11T19:41:44.064Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-09-16T08:09:37.989Z"},"containers":{"cna":{"title":"Drivers: vmbus: Check for channel allocation before looking up relids","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nDrivers: vmbus: Check for channel allocation before looking up relids\n\nrelid2channel() assumes vmbus channel array to be allocated when called.\nHowever, in cases such as kdump/kexec, not all relids will be reset by the host.\nWhen the second kernel boots and if the guest receives a vmbus interrupt during\nvmbus driver initialization before vmbus_connect() is called, before it finishes,\nor if it fails, the vmbus interrupt service routine is called which in turn calls\nrelid2channel() and can cause a null pointer dereference.\n\nPrint a warning and error out in relid2channel() for a channel id that's invalid\nin the second kernel."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8b6a877c060ed6b86878fe66c7c6493a6054cf23","status":"affected","lessThan":"176c6b4889195fbe7016d9401175b48c5c9edf68","versionType":"git"},{"version":"8b6a877c060ed6b86878fe66c7c6493a6054cf23","status":"affected","lessThan":"c373e49fbb87aa177819866ed9194ebc5414dfd6","versionType":"git"},{"version":"8b6a877c060ed6b86878fe66c7c6493a6054cf23","status":"affected","lessThan":"8c3f0ae5435fd20bb1e3a8308488aa6ac33151ee","versionType":"git"},{"version":"8b6a877c060ed6b86878fe66c7c6493a6054cf23","status":"affected","lessThan":"a5c44f3446a0565139b7d8abc78f58b86c398123","versionType":"git"},{"version":"8b6a877c060ed6b86878fe66c7c6493a6054cf23","status":"affected","lessThan":"1eb65c8687316c65140b48fad27133d583178e15","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hv/connection.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.8","versionType":"semver"},{"version":"5.10.178","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.107","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.24","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.11","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hv/connection.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/176c6b4889195fbe7016d9401175b48c5c9edf68"},{"url":"https://git.kernel.org/stable/c/c373e49fbb87aa177819866ed9194ebc5414dfd6"},{"url":"https://git.kernel.org/stable/c/8c3f0ae5435fd20bb1e3a8308488aa6ac33151ee"},{"url":"https://git.kernel.org/stable/c/a5c44f3446a0565139b7d8abc78f58b86c398123"},{"url":"https://git.kernel.org/stable/c/1eb65c8687316c65140b48fad27133d583178e15"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:41:44.064Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"5.10.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"5.15.107"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.1.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.3"}]}]}],"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":{"id":"CVE-2023-53273","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-01-14T18:06:11.099116Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","type":"CWE","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-14T18:12:53.719Z"}}]}}}