{"api_version":"1","generated_at":"2026-07-23T20:04:29+00:00","cve":"CVE-2026-63932","urls":{"html":"https://cve.report/CVE-2026-63932","api":"https://cve.report/api/cve/CVE-2026-63932.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63932","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63932"},"summary":{"title":"iio: chemical: mhz19b: reject oversized serial replies","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niio: chemical: mhz19b: reject oversized serial replies\n\nmhz19b_receive_buf() appends each serdev chunk into the fixed\nMHZ19B_CMD_SIZE receive buffer and advances buf_idx by len without\nchecking that the chunk fits in the remaining space. A large callback\ncan therefore overflow st->buf before the command path validates the\nreply.\n\nReset the reply state before each command and reject oversized serial\nreplies before copying them into the fixed buffer. When an oversized\nreply is detected, wake the waiter and report -EMSGSIZE instead of\noverwriting st->buf.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:11","updated_at":"2026-07-19 16:17:11"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a5a05410cb34bfa486d63684cdc1f87a3b13f20a","name":"https://git.kernel.org/stable/c/a5a05410cb34bfa486d63684cdc1f87a3b13f20a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ea69e7a6efa88ef32090a91064c362738cc19ddd","name":"https://git.kernel.org/stable/c/ea69e7a6efa88ef32090a91064c362738cc19ddd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/673478bc29cf72010faaf293c1c8c667393335a0","name":"https://git.kernel.org/stable/c/673478bc29cf72010faaf293c1c8c667393335a0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63932","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63932","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4572a70b3681e38055c78d12fb68cd147bdbee7d a5a05410cb34bfa486d63684cdc1f87a3b13f20a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4572a70b3681e38055c78d12fb68cd147bdbee7d ea69e7a6efa88ef32090a91064c362738cc19ddd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4572a70b3681e38055c78d12fb68cd147bdbee7d 673478bc29cf72010faaf293c1c8c667393335a0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.16","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.35 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.12 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63932","cve":"CVE-2026-63932","epss":"0.001980000","percentile":"0.097900000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/iio/chemical/mhz19b.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a5a05410cb34bfa486d63684cdc1f87a3b13f20a","status":"affected","version":"4572a70b3681e38055c78d12fb68cd147bdbee7d","versionType":"git"},{"lessThan":"ea69e7a6efa88ef32090a91064c362738cc19ddd","status":"affected","version":"4572a70b3681e38055c78d12fb68cd147bdbee7d","versionType":"git"},{"lessThan":"673478bc29cf72010faaf293c1c8c667393335a0","status":"affected","version":"4572a70b3681e38055c78d12fb68cd147bdbee7d","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/iio/chemical/mhz19b.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.16"},{"lessThan":"6.16","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.35","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.12","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.35","versionStartIncluding":"6.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.12","versionStartIncluding":"6.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"6.16","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niio: chemical: mhz19b: reject oversized serial replies\n\nmhz19b_receive_buf() appends each serdev chunk into the fixed\nMHZ19B_CMD_SIZE receive buffer and advances buf_idx by len without\nchecking that the chunk fits in the remaining space. A large callback\ncan therefore overflow st->buf before the command path validates the\nreply.\n\nReset the reply state before each command and reject oversized serial\nreplies before copying them into the fixed buffer. When an oversized\nreply is detected, wake the waiter and report -EMSGSIZE instead of\noverwriting st->buf."}],"providerMetadata":{"dateUpdated":"2026-07-19T14:55:31.460Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a5a05410cb34bfa486d63684cdc1f87a3b13f20a"},{"url":"https://git.kernel.org/stable/c/ea69e7a6efa88ef32090a91064c362738cc19ddd"},{"url":"https://git.kernel.org/stable/c/673478bc29cf72010faaf293c1c8c667393335a0"}],"title":"iio: chemical: mhz19b: reject oversized serial replies","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63932","datePublished":"2026-07-19T14:55:31.460Z","dateReserved":"2026-07-19T07:54:57.021Z","dateUpdated":"2026-07-19T14:55:31.460Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:11","lastModifiedDate":"2026-07-19 16:17:11","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63932","Ordinal":"1","Title":"iio: chemical: mhz19b: reject oversized serial replies","CVE":"CVE-2026-63932","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63932","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\niio: chemical: mhz19b: reject oversized serial replies\n\nmhz19b_receive_buf() appends each serdev chunk into the fixed\nMHZ19B_CMD_SIZE receive buffer and advances buf_idx by len without\nchecking that the chunk fits in the remaining space. A large callback\ncan therefore overflow st->buf before the command path validates the\nreply.\n\nReset the reply state before each command and reject oversized serial\nreplies before copying them into the fixed buffer. When an oversized\nreply is detected, wake the waiter and report -EMSGSIZE instead of\noverwriting st->buf.","Type":"Description","Title":"iio: chemical: mhz19b: reject oversized serial replies"}]}}}