Answer in brief
CVE-2025-39713 records a Medium severity (CVSS 4.7) vulnerability in media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0f314f6c2e77beb1a232be21dd6be4e1849ba5ac <2964dbe631fd21ad7873b1752b895548d3c12496 || >=0f314f6c2e77beb1a232be21dd6be4e1849ba5ac <6aaef1a75985865d8c6c5b65fb54152060faba48 || >=0f314f6c2e77beb1a232be21dd6be4e1849ba5ac <fbc81e78d75bf28972bc22b1599559557b1a1b83 || >=0f314f6c2e77beb1a232be21dd6be4e1849ba5ac <3c3e33b7edca7a2d6a96801f287f9faeb684d655 || >=0f314f6c2e77beb1a232be21dd6be4e1849ba5ac <1c2769dc80255824542ea5a4ff1a07dcdeb1603f || >=0f314f6c2e77beb1a232be21dd6be4e1849ba5ac <ed905fe7cba03cf22ae0b84cf1b73cd1c070423a || >=0f314f6c2e77beb1a232be21dd6be4e1849ba5ac <ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59 || >=0f314f6c2e77beb1a232be21dd6be4e1849ba5ac <7af160aea26c7dc9e6734d19306128cce156ec40 | 2964dbe631fd21ad7873b1752b895548d3c12496, 6aaef1a75985865d8c6c5b65fb54152060faba48, fbc81e78d75bf28972bc22b1599559557b1a1b83, 3c3e33b7edca7a2d6a96801f287f9faeb684d655, 1c2769dc80255824542ea5a4ff1a07dcdeb1603f, ed905fe7cba03cf22ae0b84cf1b73cd1c070423a, ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59, 7af160aea26c7dc9e6734d19306128cce156ec40 |
| Linux/Linuxgeneric | 4.12 | Not reported |
| Siemens/SIMATIC CN 4100generic | >=0 <V5.0 | V5.0 |
Published upstream
Sep 5, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 28, 2026
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.
Quoted source text, attributed separately from HOL analysis.