CVE-2025-39713None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt() In the interrupt handler rain_interrupt(), the buffer full check on rain->buf_len is performed bef…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
In the Linux kernel, the following vulnerability has been resolved:
media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()
In the interrupt handler rain_interrupt(), the buffer full check on rain->buf_len is performed before acquiring rain->buf_lock. This creates a Time-of-Check to Time-of-Use (TOCTOU) race condition, as rain->buf_len is concurrently accessed and modified in the work handler rain_irq_work_handler() under the same lock.
Multiple interrupt invocations can race, with each reading buf_len before it becomes full and then proceeding. This can lead to both interrupts attempting to write to the buffer, incrementing buf_len beyond its capacity (DATA_SIZE) and causing a buffer overflow.
Fix this bug by moving the spin_lock() to before the buffer full check. This ensures that the check and the subsequent buffer modification are performed atomically, preventing the race condition. An corresponding spin_unlock() is added to the overflow path to correctly release the lock.
This possible bug was found by an experimental static analysis tool developed by our team.
Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 2964dbe631fd21ad7873b1752b895548d3c12496Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 6aaef1a75985865d8c6c5b65fb54152060faba48Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < fbc81e78d75bf28972bc22b1599559557b1a1b83Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 3c3e33b7edca7a2d6a96801f287f9faeb684d655Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 1c2769dc80255824542ea5a4ff1a07dcdeb1603fLinux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < ed905fe7cba03cf22ae0b84cf1b73cd1c070423aLinux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59Linux >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 7af160aea26c7dc9e6734d19306128cce156ec40Linux 4.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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