{"id":"CVE-2026-46234","state":"PUBLISHED","title":"vsock: fix buffer size clamping order","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: fix buffer size clamping order\n\nIn vsock_update_buffer_size(), the buffer size was being clamped to the\nmaximum first, and then to the minimum. If a user sets a minimum buffer\nsize larger than the maximum, the minimum check overrides the maximum\ncheck, inverting the constraint.\n\nThis breaks the intended socket memory boundaries by allowing the\nvsk->buffer_size to grow beyond the configured vsk->buffer_max_size.\n\nFix this by checking the minimum first, and then the maximum. This\nensures the buffer size never exceeds the buffer_max_size.","publishedAt":"2026-05-28T09:40:58.373Z","updatedAt":"2026-10-15T01:21:22.279Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"f6ec135941d2c1c2dbb87b5ce1783f4f6ac6ccca","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"caf11dfea5233a69298a1c448bbf8d1639c80536","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"01ef69785dc3162f588a361ab770b1e312800188","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"a998a7e250bf976539e05a00ec64a81292afecaa","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"310da27932dd0afe7ce7456dfe1f0814c3301f41","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"2602f7bb5818e92315feeaeb71d8ce4d5c9ab160","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"0b68881501460c3761f196469e1e503218c5e536","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"d114bfdc9b76bf93b881e195b7ec957c14227bab","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/af_vsock.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.90","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.32","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.9","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/af_vsock.c"]}],"references":["https://git.kernel.org/stable/c/f6ec135941d2c1c2dbb87b5ce1783f4f6ac6ccca","https://git.kernel.org/stable/c/caf11dfea5233a69298a1c448bbf8d1639c80536","https://git.kernel.org/stable/c/01ef69785dc3162f588a361ab770b1e312800188","https://git.kernel.org/stable/c/a998a7e250bf976539e05a00ec64a81292afecaa","https://git.kernel.org/stable/c/310da27932dd0afe7ce7456dfe1f0814c3301f41","https://git.kernel.org/stable/c/2602f7bb5818e92315feeaeb71d8ce4d5c9ab160","https://git.kernel.org/stable/c/0b68881501460c3761f196469e1e503218c5e536","https://git.kernel.org/stable/c/d114bfdc9b76bf93b881e195b7ec957c14227bab","https://cert-portal.siemens.com/productcert/html/ssa-784472.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46234.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46234","state":"PUBLISHED","datePublished":"2026-05-28T09:40:58.373Z","dateUpdated":"2026-10-15T01:21:22.279Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.106Z"},"containers":{"cna":{"title":"vsock: fix buffer size clamping order","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: fix buffer size clamping order\n\nIn vsock_update_buffer_size(), the buffer size was being clamped to the\nmaximum first, and then to the minimum. If a user sets a minimum buffer\nsize larger than the maximum, the minimum check overrides the maximum\ncheck, inverting the constraint.\n\nThis breaks the intended socket memory boundaries by allowing the\nvsk->buffer_size to grow beyond the configured vsk->buffer_max_size.\n\nFix this by checking the minimum first, and then the maximum. This\nensures the buffer size never exceeds the buffer_max_size."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"f6ec135941d2c1c2dbb87b5ce1783f4f6ac6ccca","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"caf11dfea5233a69298a1c448bbf8d1639c80536","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"01ef69785dc3162f588a361ab770b1e312800188","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"a998a7e250bf976539e05a00ec64a81292afecaa","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"310da27932dd0afe7ce7456dfe1f0814c3301f41","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"2602f7bb5818e92315feeaeb71d8ce4d5c9ab160","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"0b68881501460c3761f196469e1e503218c5e536","versionType":"git"},{"version":"b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97","status":"affected","lessThan":"d114bfdc9b76bf93b881e195b7ec957c14227bab","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/af_vsock.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.90","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.32","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.9","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/af_vsock.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f6ec135941d2c1c2dbb87b5ce1783f4f6ac6ccca"},{"url":"https://git.kernel.org/stable/c/caf11dfea5233a69298a1c448bbf8d1639c80536"},{"url":"https://git.kernel.org/stable/c/01ef69785dc3162f588a361ab770b1e312800188"},{"url":"https://git.kernel.org/stable/c/a998a7e250bf976539e05a00ec64a81292afecaa"},{"url":"https://git.kernel.org/stable/c/310da27932dd0afe7ce7456dfe1f0814c3301f41"},{"url":"https://git.kernel.org/stable/c/2602f7bb5818e92315feeaeb71d8ce4d5c9ab160"},{"url":"https://git.kernel.org/stable/c/0b68881501460c3761f196469e1e503218c5e536"},{"url":"https://git.kernel.org/stable/c/d114bfdc9b76bf93b881e195b7ec957c14227bab"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-14T18:04:40.556Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.6.140"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.12.90"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.18.32"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"7.0.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"affected":[{"vendor":"Siemens","product":"SIMATIC S7-1500 TM MFP - 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