CVE-2025-39713

MEDIUM EPSS 2.6%
Published Sep 5, 20259mo ago · Modified Jun 17, 20262w ago
4.7 CVSS 3.1
Medium
Find Similar
Published Sep 5, 2025 9mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
4.7
Exploitability
1.0
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-367

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥4.12  –  <5.4.297
linuxlinux_kernel*≥5.5  –  <5.10.241
linuxlinux_kernel*≥5.11  –  <5.15.190
linuxlinux_kernel*≥5.16  –  <6.1.149
linuxlinux_kernel*≥6.2  –  <6.6.103
linuxlinux_kernel*≥6.7  –  <6.12.44
linuxlinux_kernel*≥6.13  –  <6.16.4
debiandebian_linux11.0any

References 11

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-032379.html
  • git.kernel.org https://git.kernel.org/stable/c/1c2769dc80255824542ea5a4ff1a07dcdeb1603f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2964dbe631fd21ad7873b1752b895548d3c12496
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3c3e33b7edca7a2d6a96801f287f9faeb684d655
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6aaef1a75985865d8c6c5b65fb54152060faba48
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7af160aea26c7dc9e6734d19306128cce156ec40
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ed905fe7cba03cf22ae0b84cf1b73cd1c070423a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fbc81e78d75bf28972bc22b1599559557b1a1b83
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
    Third Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Third Party Advisory

Remediation

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