Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2025-39713: media: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()

Noroxi assessment

Priority: Monitor (action score 18/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.13% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 1c2769dc80255824542ea5a4ff1a07dcdeb1603f, 2964dbe631fd21ad7873b1752b895548d3c12496, 3c3e33b7edca7a2d6a96801f287f9faeb684d655.

Low priority for now. Upgrade to Linux Linux 1c2769dc80255824542ea5a4ff1a07dcdeb1603f, 2964dbe631fd21ad7873b1752b895548d3c12496, 3c3e33b7edca7a2d6a96801f287f9faeb684d655 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 4.7 · v3.1—No exploit Fix available
Published
Sep 5, 2025
Updated
Oct 19, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
18 / 40 · 4.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-39713

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux11.0
  • linux linux kernel5.5 and later · before 5.10.241
  • linux linux kernel5.11 and later · before 5.15.190
  • linux linux kernel5.16 and later · before 6.1.149
  • linux linux kernel4.12 and later · before 5.4.297
  • linux linux kernel6.7 and later · before 6.12.44
  • linux linux kernel6.13 and later · before 6.16.4
  • linux linux kernel6.2 and later · before 6.6.103

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.12affected
    • 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac and later · before 2964dbe631fd21ad7873b1752b895548d3c12496affected · git
    • 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac and later · before 6aaef1a75985865d8c6c5b65fb54152060faba48affected · git
    • 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac and later · before fbc81e78d75bf28972bc22b1599559557b1a1b83affected · git
    • 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac and later · before 3c3e33b7edca7a2d6a96801f287f9faeb684d655affected · git
    • 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac and later · before 1c2769dc80255824542ea5a4ff1a07dcdeb1603faffected · git
    • 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac and later · before ed905fe7cba03cf22ae0b84cf1b73cd1c070423aaffected · git
    • 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac and later · before ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59affected · git
    • 0f314f6c2e77beb1a232be21dd6be4e1849ba5ac and later · before 7af160aea26c7dc9e6734d19306128cce156ec40affected · git
    • before 4.12not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.153-16.1.153-1
Debian:13linuxbefore 6.12.48-16.12.48-1
Debian:14linuxbefore 6.16.5-16.16.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-39711Sep 5, 2025 · media: ivsc: Fix crash at shutdown due to missing mei_cldev_disable() calls
    31Monitor
  • ← EarlierCVE-2025-39712Sep 5, 2025 · media: mt9m114: Fix deadlock in get_frame_interval/set_frame_interval
    22Monitor
  • Later →CVE-2025-39714Sep 5, 2025 · media: usbtv: Lock resolution while streaming
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1c2769dc80255824542ea5a4ff1a07dcdeb1603fVendor (CNA)
Linux Linux2964dbe631fd21ad7873b1752b895548d3c12496Vendor (CNA)
Linux Linux3c3e33b7edca7a2d6a96801f287f9faeb684d655Vendor (CNA)
Linux Linux6aaef1a75985865d8c6c5b65fb54152060faba48Vendor (CNA)
Linux Linux7af160aea26c7dc9e6734d19306128cce156ec40Vendor (CNA)
Linux Linuxed905fe7cba03cf22ae0b84cf1b73cd1c070423aVendor (CNA)
Linux Linuxfbc81e78d75bf28972bc22b1599559557b1a1b83Vendor (CNA)
Linux Linuxff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59Vendor (CNA)
debian:linux6.1.153-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-3835245 days apartposix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()KEV
    61This week
  • CVE-2026-64091317 days apartbatman-adv: tt: fix TOCTOU race for reported vlans
    39Monitor
  • CVE-2026-64034317 days apartnet: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer
    37Monitor
  • CVE-2026-31678232 days apartopenvswitch: defer tunnel netdev_put to RCU release
    31Monitor
  • CVE-2026-43433245 days apartrust_binder: avoid reading the written value in offsets array
    31Monitor
  • CVE-2026-53250293 days apartxsk: cache csum_start/csum_offset to fix TOCTOU in xsk_skb_metadata()
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records