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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-39713
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-05 18:15:48 UTC
Updated2026-05-12 13:17:07 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-367

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac 2964dbe631fd21ad7873b1752b895548d3c12496 git Not specified
CNA Linux Linux affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac 6aaef1a75985865d8c6c5b65fb54152060faba48 git Not specified
CNA Linux Linux affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac fbc81e78d75bf28972bc22b1599559557b1a1b83 git Not specified
CNA Linux Linux affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac 3c3e33b7edca7a2d6a96801f287f9faeb684d655 git Not specified
CNA Linux Linux affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac 1c2769dc80255824542ea5a4ff1a07dcdeb1603f git Not specified
CNA Linux Linux affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac ed905fe7cba03cf22ae0b84cf1b73cd1c070423a git Not specified
CNA Linux Linux affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59 git Not specified
CNA Linux Linux affected 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac 7af160aea26c7dc9e6734d19306128cce156ec40 git Not specified
CNA Linux Linux affected 4.12 Not specified
CNA Linux Linux unaffected 4.12 semver Not specified
CNA Linux Linux unaffected 5.4.297 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.241 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.190 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.149 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.103 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.44 6.12.* semver Not specified
CNA Linux Linux unaffected 6.16.4 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC CN 4100 affected V5.0 custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6aaef1a75985865d8c6c5b65fb54152060faba48 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1c2769dc80255824542ea5a4ff1a07dcdeb1603f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
git.kernel.org/stable/c/3c3e33b7edca7a2d6a96801f287f9faeb684d655 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2964dbe631fd21ad7873b1752b895548d3c12496 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fbc81e78d75bf28972bc22b1599559557b1a1b83 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-032379.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/ed905fe7cba03cf22ae0b84cf1b73cd1c070423a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00007.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
git.kernel.org/stable/c/7af160aea26c7dc9e6734d19306128cce156ec40 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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