CVE-2025-39713 (GCVE-0-2025-39713)
Vulnerability from cvelistv5
Published
2025-09-05 17:21
Modified
2025-11-03 17:42
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac
Version: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac
Version: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac
Version: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac
Version: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac
Version: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac
Version: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac
Version: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac
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          "value": "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."
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    "cveId": "CVE-2025-39713",
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    "dateReserved": "2025-04-16T07:20:57.116Z",
    "dateUpdated": "2025-11-03T17:42:39.229Z",
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}


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