{"id":"CVE-2026-31741","state":"PUBLISHED","title":"counter: rz-mtu3-cnt: prevent counter from being toggled multiple times","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncounter: rz-mtu3-cnt: prevent counter from being toggled multiple times\n\nRuntime PM counter is incremented / decremented each time the sysfs\nenable file is written to.\n\nIf user writes 0 to the sysfs enable file multiple times, runtime PM\nusage count underflows, generating the following message.\n\nrz-mtu3-counter rz-mtu3-counter.0: Runtime PM usage count underflow!\n\nAt the same time, hardware registers end up being accessed with clocks\noff in rz_mtu3_terminate_counter() to disable an already disabled\nchannel.\n\nIf user writes 1 to the sysfs enable file multiple times, runtime PM\nusage count will be incremented each time, requiring the same number of\n0 writes to get it back to 0.\n\nIf user writes 0 to the sysfs enable file while PWM is in progress, PWM\nis stopped without counter being the owner of the underlying MTU3\nchannel.\n\nCheck against the cached count_is_enabled value and exit if the user\nis trying to set the same enable value.","publishedAt":"2026-05-01T14:14:36.845Z","updatedAt":"2026-05-11T22:14:51.833Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0be8907359df4c62319f5cb2c6981ff0d9ebf35a","status":"affected","lessThan":"885aa739a07ab45e90dfa997205acec97979ce4e","versionType":"git"},{"version":"0be8907359df4c62319f5cb2c6981ff0d9ebf35a","status":"affected","lessThan":"ced8b48420eddb1251f93c22dc23fa136490b3cd","versionType":"git"},{"version":"0be8907359df4c62319f5cb2c6981ff0d9ebf35a","status":"affected","lessThan":"e07237df8538b0ae98dce112e4f6db093d767f80","versionType":"git"},{"version":"0be8907359df4c62319f5cb2c6981ff0d9ebf35a","status":"affected","lessThan":"f5f6f06d7e6d262026578b59ba7426eb04acce5d","versionType":"git"},{"version":"0be8907359df4c62319f5cb2c6981ff0d9ebf35a","status":"affected","lessThan":"67c3f99bed6f422ba343d2b70a2eeeccdfd91bef","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/counter/rz-mtu3-cnt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/counter/rz-mtu3-cnt.c"]}],"references":["https://git.kernel.org/stable/c/885aa739a07ab45e90dfa997205acec97979ce4e","https://git.kernel.org/stable/c/ced8b48420eddb1251f93c22dc23fa136490b3cd","https://git.kernel.org/stable/c/e07237df8538b0ae98dce112e4f6db093d767f80","https://git.kernel.org/stable/c/f5f6f06d7e6d262026578b59ba7426eb04acce5d","https://git.kernel.org/stable/c/67c3f99bed6f422ba343d2b70a2eeeccdfd91bef"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31741.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31741","state":"PUBLISHED","datePublished":"2026-05-01T14:14:36.845Z","dateUpdated":"2026-05-11T22:14:51.833Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.138Z"},"containers":{"cna":{"title":"counter: rz-mtu3-cnt: prevent counter from being toggled multiple times","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncounter: rz-mtu3-cnt: prevent counter from being toggled multiple times\n\nRuntime PM counter is incremented / decremented each time the sysfs\nenable file is written to.\n\nIf user writes 0 to the sysfs enable file multiple times, runtime PM\nusage count underflows, generating the following message.\n\nrz-mtu3-counter rz-mtu3-counter.0: Runtime PM usage count underflow!\n\nAt the same time, hardware registers end up being accessed with clocks\noff in rz_mtu3_terminate_counter() to disable an already disabled\nchannel.\n\nIf user writes 1 to the sysfs enable file multiple times, runtime PM\nusage count will be incremented each time, requiring the same number of\n0 writes to get it back to 0.\n\nIf user writes 0 to the sysfs enable file while PWM is in progress, PWM\nis stopped without counter being the owner of the underlying MTU3\nchannel.\n\nCheck against the cached count_is_enabled value and exit if the user\nis trying to set the same enable value."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0be8907359df4c62319f5cb2c6981ff0d9ebf35a","status":"affected","lessThan":"885aa739a07ab45e90dfa997205acec97979ce4e","versionType":"git"},{"version":"0be8907359df4c62319f5cb2c6981ff0d9ebf35a","status":"affected","lessThan":"ced8b48420eddb1251f93c22dc23fa136490b3cd","versionType":"git"},{"version":"0be8907359df4c62319f5cb2c6981ff0d9ebf35a","status":"affected","lessThan":"e07237df8538b0ae98dce112e4f6db093d767f80","versionType":"git"},{"version":"0be8907359df4c62319f5cb2c6981ff0d9ebf35a","status":"affected","lessThan":"f5f6f06d7e6d262026578b59ba7426eb04acce5d","versionType":"git"},{"version":"0be8907359df4c62319f5cb2c6981ff0d9ebf35a","status":"affected","lessThan":"67c3f99bed6f422ba343d2b70a2eeeccdfd91bef","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/counter/rz-mtu3-cnt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/counter/rz-mtu3-cnt.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/885aa739a07ab45e90dfa997205acec97979ce4e"},{"url":"https://git.kernel.org/stable/c/ced8b48420eddb1251f93c22dc23fa136490b3cd"},{"url":"https://git.kernel.org/stable/c/e07237df8538b0ae98dce112e4f6db093d767f80"},{"url":"https://git.kernel.org/stable/c/f5f6f06d7e6d262026578b59ba7426eb04acce5d"},{"url":"https://git.kernel.org/stable/c/67c3f99bed6f422ba343d2b70a2eeeccdfd91bef"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:14:51.833Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.6.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}