CVE-2025-39713

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Source
https://cve.org/CVERecord?id=CVE-2025-39713
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39713.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-39713
Downstream
Related
Published
2025-09-05T17:21:20.459Z
Modified
2026-03-12T02:17:59.536920Z
Summary
media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()
Details

In the Linux kernel, the following vulnerability has been resolved:

media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()

In the interrupt handler raininterrupt(), the buffer full check on rain->buflen is performed before acquiring rain->buflock. This creates a Time-of-Check to Time-of-Use (TOCTOU) race condition, as rain->buflen is concurrently accessed and modified in the work handler rainirqwork_handler() under the same lock.

Multiple interrupt invocations can race, with each reading buflen before it becomes full and then proceeding. This can lead to both interrupts attempting to write to the buffer, incrementing buflen beyond its capacity (DATA_SIZE) and causing a buffer overflow.

Fix this bug by moving the spinlock() 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 spinunlock() 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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39713.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
0f314f6c2e77beb1a232be21dd6be4e1849ba5ac
Fixed
2964dbe631fd21ad7873b1752b895548d3c12496
Fixed
6aaef1a75985865d8c6c5b65fb54152060faba48
Fixed
fbc81e78d75bf28972bc22b1599559557b1a1b83
Fixed
3c3e33b7edca7a2d6a96801f287f9faeb684d655
Fixed
1c2769dc80255824542ea5a4ff1a07dcdeb1603f
Fixed
ed905fe7cba03cf22ae0b84cf1b73cd1c070423a
Fixed
ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59
Fixed
7af160aea26c7dc9e6734d19306128cce156ec40

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39713.json"