CVE-2025-39713

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.

Gravité et risque d'exploitation

CVE-2025-39713 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.14 %, ce qui la place devant 2.9 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 6.12.44, <1c2769dc80255824542ea5a4ff1a07dcdeb1603f, <=6.16.*, 6.16.4, 6.17, 0, <6aaef1a75985865d8c6c5b65fb54152060faba48, 5.4.297, 6.6.103, 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac, <=5.10.*, <=6.6.*, 5.15.190, <fbc81e78d75bf28972bc22b1599559557b1a1b83, 4.12, <=5.4.*, <ed905fe7cba03cf22ae0b84cf1b73cd1c070423a, 6.1.149, 5.10.241, <3c3e33b7edca7a2d6a96801f287f9faeb684d655, <=*, <=5.15.*, <4.12, <7af160aea26c7dc9e6734d19306128cce156ec40, <ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59, <2964dbe631fd21ad7873b1752b895548d3c12496) est présent sur votre parc.
• Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
• À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
• Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

• https://git.kernel.org/stable/c/2964dbe631fd21ad7873b1752b895548d3c12496
• https://git.kernel.org/stable/c/6aaef1a75985865d8c6c5b65fb54152060faba48
• https://git.kernel.org/stable/c/fbc81e78d75bf28972bc22b1599559557b1a1b83
• https://git.kernel.org/stable/c/3c3e33b7edca7a2d6a96801f287f9faeb684d655
• https://git.kernel.org/stable/c/1c2769dc80255824542ea5a4ff1a07dcdeb1603f
• https://git.kernel.org/stable/c/ed905fe7cba03cf22ae0b84cf1b73cd1c070423a
• https://git.kernel.org/stable/c/ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59
• https://git.kernel.org/stable/c/7af160aea26c7dc9e6734d19306128cce156ec40