igc: fix PTM cycle trigger logic (Linux Linux)

CVE-2025-37875
MEDIUM 5.5

En bref

Source
NVD
EPSS
EPSS 0.29 % · centile 21 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Analyzed

Description

In the Linux kernel, the following vulnerability has been resolved: igc: fix PTM cycle trigger logic Writing to clear the PTM status 'valid' bit while the PTM cycle is triggered results in unreliable PTM operation. To fix this, clear the PTM 'trigger' and status after each PTM transaction. The issue can be reproduced with the following: $ sudo phc2sys -R 1000 -O 0 -i tsn0 -m Note: 1000 Hz (-R 1000) is unrealistically large, but provides a way to quickly reproduce the issue. PHC2SYS exits with: "ioctl PTP_OFFSET_PRECISE: Connection timed out" when the PTM transaction fails This patch also fixes a hang in igc_probe() when loading the igc driver in the kdump kernel on systems supporting PTM. The igc driver running in the base kernel enables PTM trigger in igc_probe(). Therefore the driver is always in PTM trigger mode, except in brief periods when manually triggering a PTM cycle. When a crash occurs, the NIC is reset while PTM trigger is enabled. Due to a hardware problem, the NIC is subsequently in a bad busmaster state and doesn't handle register reads/writes. When running igc_probe() in the kdump kernel, the first register access to a NIC register hangs driver probing and ultimately breaks kdump. With this patch, igc has PTM trigger disabled most of the time, and the trigger is only enabled for very brief (10 - 100 us) periods when manually triggering a PTM cycle. Chances that a crash occurs during a PTM trigger are not 0, but extremely reduced.

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected a90ec84837325df4b9a6798c2cc0df202b5680bd < c1f174edaccc5a00f8e218c42a0aa9156efd5f76 ; affected a90ec84837325df4b9a6798c2cc0df202b5680bd < 0c03e4fbe1321697d9d04587e21e416705e1b19f ; affected a90ec84837325df4b9a6798c2cc0df202b5680bd < 16194ca3f3b4448a062650c869a7b3b206c6f5d3 ; affected a90ec84837325df4b9a6798c2cc0df202b5680bd < f3516229cd12dcd45f23ed01adab17e8772b1bd5 ; affected a90ec84837325df4b9a6798c2cc0df202b5680bd < 31959e06143692f7e02b8eef7d7d6ac645637906 ; affected a90ec84837325df4b9a6798c2cc0df202b5680bd < 8e404ad95d2c10c261e2ef6992c7c12dde03df0e
Linux · Linuxaffected 5.15 ; unaffected 0 < 5.15 ; unaffected 5.15.181 ≤ 5.15.* ; unaffected 6.1.135 ≤ 6.1.* ; unaffected 6.6.88 ≤ 6.6.* ; unaffected 6.12.25 ≤ 6.12.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD