{"id":"CVE-2025-39713","title":"media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()","summary":"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->buf_len is performed bef…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 2964dbe631fd21ad7873b1752b895548d3c12496","Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 6aaef1a75985865d8c6c5b65fb54152060faba48","Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < fbc81e78d75bf28972bc22b1599559557b1a1b83","Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 3c3e33b7edca7a2d6a96801f287f9faeb684d655","Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 1c2769dc80255824542ea5a4ff1a07dcdeb1603f","Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < ed905fe7cba03cf22ae0b84cf1b73cd1c070423a","Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59","Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 7af160aea26c7dc9e6734d19306128cce156ec40","Linux 4.12"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T21:08:41.457511Z"},"published":"2025-09-05","updated":"2026-11-05","sourceUpdated":"2026-11-05T21:12:55.445Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39713","references":[{"url":"https://git.kernel.org/stable/c/2964dbe631fd21ad7873b1752b895548d3c12496"},{"url":"https://git.kernel.org/stable/c/6aaef1a75985865d8c6c5b65fb54152060faba48"},{"url":"https://git.kernel.org/stable/c/fbc81e78d75bf28972bc22b1599559557b1a1b83"},{"url":"https://git.kernel.org/stable/c/3c3e33b7edca7a2d6a96801f287f9faeb684d655"},{"url":"https://git.kernel.org/stable/c/1c2769dc80255824542ea5a4ff1a07dcdeb1603f"},{"url":"https://git.kernel.org/stable/c/ed905fe7cba03cf22ae0b84cf1b73cd1c070423a"},{"url":"https://git.kernel.org/stable/c/ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59"},{"url":"https://git.kernel.org/stable/c/7af160aea26c7dc9e6734d19306128cce156ec40"}],"tags":["cve.org"],"epss":0.00144,"epssPercentile":0.03717,"ingestedAt":"2026-11-05T22:38:32.019Z","slug":"CVE-2025-39713","body":"## Overview\n\nIn 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->buf_len is performed before acquiring rain->buf_lock. This\ncreates a Time-of-Check to Time-of-Use (TOCTOU) race condition, as\nrain->buf_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.\n\n## Affected\n\n- `Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 2964dbe631fd21ad7873b1752b895548d3c12496`\n- `Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 6aaef1a75985865d8c6c5b65fb54152060faba48`\n- `Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < fbc81e78d75bf28972bc22b1599559557b1a1b83`\n- `Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 3c3e33b7edca7a2d6a96801f287f9faeb684d655`\n- `Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 1c2769dc80255824542ea5a4ff1a07dcdeb1603f`\n- `Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < ed905fe7cba03cf22ae0b84cf1b73cd1c070423a`\n- `Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59`\n- `Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 7af160aea26c7dc9e6734d19306128cce156ec40`\n- `Linux 4.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}