CVE-2025-39713
published 2025-09-05CVE-2025-39713: In the Linux kernel, the following vulnerability has been resolved: media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt() In the interrupt…
medium4.7CVSS 3.1
AVLACHPRLUINSUCNINAH
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.
Affected
36 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | linux | < linux 6.1.153-1 (bookworm) | linux 6.1.153-1 (bookworm) |
| debian | linux-6.1 | < linux 6.1.153-1 (bookworm) | linux 6.1.153-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 2964dbe631fd21ad7873b1752b895548d3c12496 | 2964dbe631fd21ad7873b1752b895548d3c12496 |
| linux | linux | >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 6aaef1a75985865d8c6c5b65fb54152060faba48 | 6aaef1a75985865d8c6c5b65fb54152060faba48 |
| linux | linux | >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < fbc81e78d75bf28972bc22b1599559557b1a1b83 | fbc81e78d75bf28972bc22b1599559557b1a1b83 |
| linux | linux | >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 3c3e33b7edca7a2d6a96801f287f9faeb684d655 | 3c3e33b7edca7a2d6a96801f287f9faeb684d655 |
| linux | linux | >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 1c2769dc80255824542ea5a4ff1a07dcdeb1603f | 1c2769dc80255824542ea5a4ff1a07dcdeb1603f |
| linux | linux | >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < ed905fe7cba03cf22ae0b84cf1b73cd1c070423a | ed905fe7cba03cf22ae0b84cf1b73cd1c070423a |
| linux | linux | >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59 | ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59 |
| linux | linux | >= 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac < 7af160aea26c7dc9e6734d19306128cce156ec40 | 7af160aea26c7dc9e6734d19306128cce156ec40 |
| linux | linux_kernel | >= 0 < 5.10.244-1 | 5.10.244-1 |
| linux | linux_kernel | >= 0 < 6.1.153-1 | 6.1.153-1 |
| linux | linux_kernel | >= 0 < 6.12.48-1 | 6.12.48-1 |
| linux | linux_kernel | >= 0 < 6.16.5-1 | 6.16.5-1 |
| linux | linux_kernel | >= 0 < 5.15.0-163.173 | 5.15.0-163.173 |
| linux | linux_kernel | >= 0 < 6.8.0-100.100 | 6.8.0-100.100 |
| linux | linux_kernel | >= 4.12 < 5.4.297 | 5.4.297 |
| linux | linux_kernel | >= 5.11 < 5.15.190 | 5.15.190 |
| linux | linux_kernel | >= 5.16 < 6.1.149 | 6.1.149 |
| linux | linux_kernel | >= 5.5 < 5.10.241 | 5.10.241 |
| linux | linux_kernel | >= 6.13 < 6.16.4 | 6.16.4 |
| linux | linux_kernel | >= 6.2 < 6.6.103 | 6.6.103 |
| linux | linux_kernel | >= 6.7 < 6.12.44 | 6.12.44 |
CVSS provenance
nvdv3.14.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM