{"id":"CVE-2025-39713","summary":"media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()\n\nIn the interrupt handler rain_interrupt(), the buffer full check on\nrain-\u003ebuf_len is performed before acquiring rain-\u003ebuf_lock. This\ncreates a Time-of-Check to Time-of-Use (TOCTOU) race condition, as\nrain-\u003ebuf_len is concurrently accessed and modified in the work\nhandler rain_irq_work_handler() under the same lock.\n\nMultiple interrupt invocations can race, with each reading buf_len\nbefore it becomes full and then proceeding. This can lead to both\ninterrupts attempting to write to the buffer, incrementing buf_len\nbeyond its capacity (DATA_SIZE) and causing a buffer overflow.\n\nFix this bug by moving the spin_lock() to before the buffer full\ncheck. This ensures that the check and the subsequent buffer modification\nare performed atomically, preventing the race condition. An corresponding\nspin_unlock() is added to the overflow path to correctly release the\nlock.\n\nThis possible bug was found by an experimental static analysis tool\ndeveloped by our team.","modified":"2026-04-16T04:31:04.446961723Z","published":"2025-09-05T17:21:20.459Z","related":["SUSE-SU-2025:03600-1","SUSE-SU-2025:03634-1","SUSE-SU-2025:20851-1","SUSE-SU-2025:20861-1","SUSE-SU-2025:20870-1","SUSE-SU-2025:20898-1","SUSE-SU-2025:21074-1","SUSE-SU-2025:21139-1","SUSE-SU-2025:21179-1","SUSE-SU-2025:3751-1","SUSE-SU-2025:4057-1","SUSE-SU-2025:4132-1","SUSE-SU-2025:4141-1","openSUSE-SU-2025:20081-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39713.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1c2769dc80255824542ea5a4ff1a07dcdeb1603f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2964dbe631fd21ad7873b1752b895548d3c12496"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3c3e33b7edca7a2d6a96801f287f9faeb684d655"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6aaef1a75985865d8c6c5b65fb54152060faba48"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7af160aea26c7dc9e6734d19306128cce156ec40"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed905fe7cba03cf22ae0b84cf1b73cd1c070423a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fbc81e78d75bf28972bc22b1599559557b1a1b83"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39713.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-39713"},{"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":"0f314f6c2e77beb1a232be21dd6be4e1849ba5ac"},{"fixed":"2964dbe631fd21ad7873b1752b895548d3c12496"},{"fixed":"6aaef1a75985865d8c6c5b65fb54152060faba48"},{"fixed":"fbc81e78d75bf28972bc22b1599559557b1a1b83"},{"fixed":"3c3e33b7edca7a2d6a96801f287f9faeb684d655"},{"fixed":"1c2769dc80255824542ea5a4ff1a07dcdeb1603f"},{"fixed":"ed905fe7cba03cf22ae0b84cf1b73cd1c070423a"},{"fixed":"ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59"},{"fixed":"7af160aea26c7dc9e6734d19306128cce156ec40"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39713.json"}}],"schema_version":"1.7.5"}