CVE-2025-39713 (GCVE-0-2025-39713)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:21 – Updated: 2025-11-03 17:42
VLAI?
Title
media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < 2964dbe631fd21ad7873b1752b895548d3c12496 (git)
Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < 6aaef1a75985865d8c6c5b65fb54152060faba48 (git)
Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < fbc81e78d75bf28972bc22b1599559557b1a1b83 (git)
Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < 3c3e33b7edca7a2d6a96801f287f9faeb684d655 (git)
Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < 1c2769dc80255824542ea5a4ff1a07dcdeb1603f (git)
Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < ed905fe7cba03cf22ae0b84cf1b73cd1c070423a (git)
Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59 (git)
Affected: 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac , < 7af160aea26c7dc9e6734d19306128cce156ec40 (git)
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    Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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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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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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