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

Vulnerability from cvelistv5 – Published: 2025-09-05 17:21 – Updated: 2026-05-12 12:06
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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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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