{"id":"CVE-2026-63936","state":"PUBLISHED","title":"iio: adc: mt6359: fix unchecked return value in mt6358_read_imp","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niio: adc: mt6359: fix unchecked return value in mt6358_read_imp\n\nIn mt6358_read_imp(), the variable val_v is passed to regmap_read()\nbut the return value is not checked. If the read fails, val_v remains\nuninitialized and its random stack content is subsequently reported\nas a measurement result.\n\nInitialize val_v to zero to ensure a predictable value is reported\nin case of bus failure and to prevent potential stack data leakage.\nThis also satisfies static analyzers that might otherwise flag the\nvariable as used uninitialized.","publishedAt":"2026-07-19T14:55:33.942Z","updatedAt":"2026-07-19T14:55:33.942Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3587914bf61df7924933530353d840378cdc4973","status":"affected","lessThan":"6258bfec51e894ea97b8e69f3cde7af269b37de9","versionType":"git"},{"version":"3587914bf61df7924933530353d840378cdc4973","status":"affected","lessThan":"944082fdb0284a31c0b37a88c8a1d4404da3a6d9","versionType":"git"},{"version":"3587914bf61df7924933530353d840378cdc4973","status":"affected","lessThan":"a72f8e51d6ee66c255a8a93a4421b8a538d112a8","versionType":"git"},{"version":"3587914bf61df7924933530353d840378cdc4973","status":"affected","lessThan":"f9bbd943c34a9ad60e593a4b99ce2394e4e2381b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/adc/mt6359-auxadc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.11","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","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":["drivers/iio/adc/mt6359-auxadc.c"]}],"references":["https://git.kernel.org/stable/c/6258bfec51e894ea97b8e69f3cde7af269b37de9","https://git.kernel.org/stable/c/944082fdb0284a31c0b37a88c8a1d4404da3a6d9","https://git.kernel.org/stable/c/a72f8e51d6ee66c255a8a93a4421b8a538d112a8","https://git.kernel.org/stable/c/f9bbd943c34a9ad60e593a4b99ce2394e4e2381b"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63936.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63936","state":"PUBLISHED","datePublished":"2026-07-19T14:55:33.942Z","dateUpdated":"2026-07-19T14:55:33.942Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.022Z"},"containers":{"cna":{"title":"iio: adc: mt6359: fix unchecked return value in mt6358_read_imp","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niio: adc: mt6359: fix unchecked return value in mt6358_read_imp\n\nIn mt6358_read_imp(), the variable val_v is passed to regmap_read()\nbut the return value is not checked. If the read fails, val_v remains\nuninitialized and its random stack content is subsequently reported\nas a measurement result.\n\nInitialize val_v to zero to ensure a predictable value is reported\nin case of bus failure and to prevent potential stack data leakage.\nThis also satisfies static analyzers that might otherwise flag the\nvariable as used uninitialized."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3587914bf61df7924933530353d840378cdc4973","status":"affected","lessThan":"6258bfec51e894ea97b8e69f3cde7af269b37de9","versionType":"git"},{"version":"3587914bf61df7924933530353d840378cdc4973","status":"affected","lessThan":"944082fdb0284a31c0b37a88c8a1d4404da3a6d9","versionType":"git"},{"version":"3587914bf61df7924933530353d840378cdc4973","status":"affected","lessThan":"a72f8e51d6ee66c255a8a93a4421b8a538d112a8","versionType":"git"},{"version":"3587914bf61df7924933530353d840378cdc4973","status":"affected","lessThan":"f9bbd943c34a9ad60e593a4b99ce2394e4e2381b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/adc/mt6359-auxadc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.11","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","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":["drivers/iio/adc/mt6359-auxadc.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/6258bfec51e894ea97b8e69f3cde7af269b37de9"},{"url":"https://git.kernel.org/stable/c/944082fdb0284a31c0b37a88c8a1d4404da3a6d9"},{"url":"https://git.kernel.org/stable/c/a72f8e51d6ee66c255a8a93a4421b8a538d112a8"},{"url":"https://git.kernel.org/stable/c/f9bbd943c34a9ad60e593a4b99ce2394e4e2381b"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-19T14:55:33.942Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.12.93"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.18.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"7.0.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}