{"id":"CVE-2026-89936","state":"PUBLISHED","title":"iio: dac: m62332: Fix regulator reference count imbalance","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niio: dac: m62332: Fix regulator reference count imbalance\n\nm62332_set_value() enables the Vcc regulator on every write of a\nnon-zero value and disables it on every write of zero, without tracking\nthe channel's current state. Because the regulator is reference counted,\nchanging a channel directly from one non-zero value to another enables\nit more than once, while a later write of zero disables it only once.\nThe reference count never returns to zero and the regulator is left\nenabled indefinitely.\n\nOnly enable the regulator on the transition from zero to non-zero, and\nonly disable it on the transition from non-zero to zero, using the\npreviously stored channel value to detect the edge. Balance the\nregulator on the I2C error path so the reference count stays consistent\nif the write fails.","publishedAt":"2026-09-16T10:32:25.608Z","updatedAt":"2026-10-19T08:55:10.788Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"bac0ed8bee651aa841375edf72c6ab1d10ac80c6","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"9263b9ad968a563337a60e0eb66e35186e1faf9a","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"1d3a7d7dd3adee19e00be2b2237140f0fe169484","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"f5acb824277a97a5210c454872202bf7f08c75d4","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"ae18d2d2ef27a4d04fda6e30c23774513dc9be1e","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"08ac8d2976d57aa943d64e351c4d0bd8bb0c6de9","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"9fe22f563b2a0fdb11fd3711a8c39c023629c08a","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"a130404ce0b69ca1438126bd81c1985d3b4d2e6f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/dac/m62332.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/dac/m62332.c"]}],"references":["https://git.kernel.org/stable/c/bac0ed8bee651aa841375edf72c6ab1d10ac80c6","https://git.kernel.org/stable/c/9263b9ad968a563337a60e0eb66e35186e1faf9a","https://git.kernel.org/stable/c/1d3a7d7dd3adee19e00be2b2237140f0fe169484","https://git.kernel.org/stable/c/f5acb824277a97a5210c454872202bf7f08c75d4","https://git.kernel.org/stable/c/ae18d2d2ef27a4d04fda6e30c23774513dc9be1e","https://git.kernel.org/stable/c/08ac8d2976d57aa943d64e351c4d0bd8bb0c6de9","https://git.kernel.org/stable/c/9fe22f563b2a0fdb11fd3711a8c39c023629c08a","https://git.kernel.org/stable/c/a130404ce0b69ca1438126bd81c1985d3b4d2e6f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89936.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89936","state":"PUBLISHED","datePublished":"2026-09-16T10:32:25.608Z","dateUpdated":"2026-10-19T08:55:10.788Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.776Z"},"containers":{"cna":{"title":"iio: dac: m62332: Fix regulator reference count imbalance","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niio: dac: m62332: Fix regulator reference count imbalance\n\nm62332_set_value() enables the Vcc regulator on every write of a\nnon-zero value and disables it on every write of zero, without tracking\nthe channel's current state. Because the regulator is reference counted,\nchanging a channel directly from one non-zero value to another enables\nit more than once, while a later write of zero disables it only once.\nThe reference count never returns to zero and the regulator is left\nenabled indefinitely.\n\nOnly enable the regulator on the transition from zero to non-zero, and\nonly disable it on the transition from non-zero to zero, using the\npreviously stored channel value to detect the edge. Balance the\nregulator on the I2C error path so the reference count stays consistent\nif the write fails."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"bac0ed8bee651aa841375edf72c6ab1d10ac80c6","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"9263b9ad968a563337a60e0eb66e35186e1faf9a","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"1d3a7d7dd3adee19e00be2b2237140f0fe169484","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"f5acb824277a97a5210c454872202bf7f08c75d4","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"ae18d2d2ef27a4d04fda6e30c23774513dc9be1e","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"08ac8d2976d57aa943d64e351c4d0bd8bb0c6de9","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"9fe22f563b2a0fdb11fd3711a8c39c023629c08a","versionType":"git"},{"version":"b87b0c0f81e8d11c881b726b886b7502ab67d884","status":"affected","lessThan":"a130404ce0b69ca1438126bd81c1985d3b4d2e6f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/dac/m62332.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/dac/m62332.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/bac0ed8bee651aa841375edf72c6ab1d10ac80c6"},{"url":"https://git.kernel.org/stable/c/9263b9ad968a563337a60e0eb66e35186e1faf9a"},{"url":"https://git.kernel.org/stable/c/1d3a7d7dd3adee19e00be2b2237140f0fe169484"},{"url":"https://git.kernel.org/stable/c/f5acb824277a97a5210c454872202bf7f08c75d4"},{"url":"https://git.kernel.org/stable/c/ae18d2d2ef27a4d04fda6e30c23774513dc9be1e"},{"url":"https://git.kernel.org/stable/c/08ac8d2976d57aa943d64e351c4d0bd8bb0c6de9"},{"url":"https://git.kernel.org/stable/c/9fe22f563b2a0fdb11fd3711a8c39c023629c08a"},{"url":"https://git.kernel.org/stable/c/a130404ce0b69ca1438126bd81c1985d3b4d2e6f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:55:10.788Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}