{"id":"CVE-2026-31741","summary":"counter: rz-mtu3-cnt: prevent counter from being toggled multiple times","details":"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.","modified":"2026-06-18T03:56:32.066748453Z","published":"2026-05-01T14:14:36.845Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31741.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/67c3f99bed6f422ba343d2b70a2eeeccdfd91bef"},{"type":"WEB","url":"https://git.kernel.org/stable/c/885aa739a07ab45e90dfa997205acec97979ce4e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ced8b48420eddb1251f93c22dc23fa136490b3cd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e07237df8538b0ae98dce112e4f6db093d767f80"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f5f6f06d7e6d262026578b59ba7426eb04acce5d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31741.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31741"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0be8907359df4c62319f5cb2c6981ff0d9ebf35a"},{"fixed":"885aa739a07ab45e90dfa997205acec97979ce4e"},{"fixed":"ced8b48420eddb1251f93c22dc23fa136490b3cd"},{"fixed":"e07237df8538b0ae98dce112e4f6db093d767f80"},{"fixed":"f5f6f06d7e6d262026578b59ba7426eb04acce5d"},{"fixed":"67c3f99bed6f422ba343d2b70a2eeeccdfd91bef"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31741.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.4.0"},{"fixed":"6.6.134"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.81"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.22"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31741.json"}}],"schema_version":"1.7.5"}