CVE-2025-39713media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()
- 4.7MediumCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 96% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 5 months later
· 5 months later
Published
- 14 months later
· 14 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 96% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.7.
Affected products
- affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac – < 2964dbe631fd21ad7873b1752b895548d3c12496
- affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac – < 6aaef1a75985865d8c6c5b65fb54152060faba48
- affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac – < fbc81e78d75bf28972bc22b1599559557b1a1b83
- affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac – < 3c3e33b7edca7a2d6a96801f287f9faeb684d655
- affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac – < 1c2769dc80255824542ea5a4ff1a07dcdeb1603f
- affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac – < ed905fe7cba03cf22ae0b84cf1b73cd1c070423a
- affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac – < ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59
- affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac – < 7af160aea26c7dc9e6734d19306128cce156ec40
- affected 4.12
- unaffected < 4.12
- unaffected 5.4.297 – ≤ 5.4.*
- unaffected 5.10.241 – ≤ 5.10.*
- unaffected 5.15.190 – ≤ 5.15.*
- unaffected 6.1.149 – ≤ 6.1.*
- unaffected 6.6.103 – ≤ 6.6.*
- unaffected 6.12.44 – ≤ 6.12.*
- unaffected 6.16.4 – ≤ 6.16.*
- unaffected 6.17 – ≤ *
References
References11
- https://git.kernel.org/stable/c/2964dbe631fd21ad7873b1752b895548d3c12496 (opens in a new tab)
- https://git.kernel.org/stable/c/6aaef1a75985865d8c6c5b65fb54152060faba48 (opens in a new tab)
- https://git.kernel.org/stable/c/fbc81e78d75bf28972bc22b1599559557b1a1b83 (opens in a new tab)
- https://git.kernel.org/stable/c/3c3e33b7edca7a2d6a96801f287f9faeb684d655 (opens in a new tab)
- https://git.kernel.org/stable/c/1c2769dc80255824542ea5a4ff1a07dcdeb1603f (opens in a new tab)
- https://git.kernel.org/stable/c/ed905fe7cba03cf22ae0b84cf1b73cd1c070423a (opens in a new tab)
- https://git.kernel.org/stable/c/ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59 (opens in a new tab)
- https://git.kernel.org/stable/c/7af160aea26c7dc9e6734d19306128cce156ec40 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-31514 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-39713)Record last updated .