01 Record

CVE-2025-39673

ppp: fix race conditions in ppp_fill_forward_path

CriticalPUBLISHEDCNA: Linux

CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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02 Description

ppp: fix race conditions in ppp_fill_forward_path

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.30% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 23.4% of scored records. A rank, not a probability.

NVD base score

4.7 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-19.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2025-09-05 17:20Z1 YR AGO

Last updated

2026-10-15 22:02Z13 DAYS AGO

Reserved

2025-04-16

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

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

Weaknesses

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')Class

Data version

5.2

Document digest

91c7718878efc4c1a66356f182bc47c0d4e7bc1756beb7693f597ea86984cef3

05 Affected products

VendorProductVersionsPlatforms

LinuxLinuxf6efc675c9dd8d93f826b79ae7e33e03301db609 to < 9a1969fbffc1f1900d92d7594b1b7d8d72ef3dc7, f6efc675c9dd8d93f826b79ae7e33e03301db609 to < 0f1630be6fcca3f0c63e4b242ad202e5cde28a40, f6efc675c9dd8d93f826b79ae7e33e03301db609 to < ca18d751bcc9faf5b7e82e9fae1223d103928181, f6efc675c9dd8d93f826b79ae7e33e03301db609 to < 94731cc551e29511d85aa8dec61a6c071b1f2430, f6efc675c9dd8d93f826b79ae7e33e03301db609 to < f97f6475fdcb3c28ff3c55cc4b7bde632119ec08, f6efc675c9dd8d93f826b79ae7e33e03301db609 to < 0417adf367a0af11adf7ace849af4638cfb573f7, 5.13—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/9a1969fbffc1f1900d92d7594b1b7d8d72ef3dc7
git.kernel.orghttps://git.kernel.org/stable/c/0f1630be6fcca3f0c63e4b242ad202e5cde28a40
git.kernel.orghttps://git.kernel.org/stable/c/ca18d751bcc9faf5b7e82e9fae1223d103928181
git.kernel.orghttps://git.kernel.org/stable/c/94731cc551e29511d85aa8dec61a6c071b1f2430
git.kernel.orghttps://git.kernel.org/stable/c/f97f6475fdcb3c28ff3c55cc4b7bde632119ec08
git.kernel.orghttps://git.kernel.org/stable/c/0417adf367a0af11adf7ace849af4638cfb573f7
lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-032379.html

07 Fixed in

Debian 12

linux
Fixed in 6.1.153-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.12.48-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 6.16.5-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.