CVE-2025-38126

Description

In the Linux kernel, the following vulnerability has been resolved: net: stmmac: make sure that ptp_rate is not 0 before configuring timestamping The stmmac platform drivers that do not open-code the clk_ptp_rate value after having retrieved the default one from the device-tree can end up with 0 in clk_ptp_rate (as clk_get_rate can return 0). It will eventually propagate up to PTP initialization when bringing up the interface, leading to a divide by 0: Division by zero in kernel. CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.30-00001-g48313bd5768a #22 Hardware name: STM32 (Device Tree Support) Call trace: unwind_backtrace from show_stack+0x18/0x1c show_stack from dump_stack_lvl+0x6c/0x8c dump_stack_lvl from Ldiv0_64+0x8/0x18 Ldiv0_64 from stmmac_init_tstamp_counter+0x190/0x1a4 stmmac_init_tstamp_counter from stmmac_hw_setup+0xc1c/0x111c stmmac_hw_setup from __stmmac_open+0x18c/0x434 __stmmac_open from stmmac_open+0x3c/0xbc stmmac_open from __dev_open+0xf4/0x1ac __dev_open from __dev_change_flags+0x1cc/0x224 __dev_change_flags from dev_change_flags+0x24/0x60 dev_change_flags from ip_auto_config+0x2e8/0x11a0 ip_auto_config from do_one_initcall+0x84/0x33c do_one_initcall from kernel_init_freeable+0x1b8/0x214 kernel_init_freeable from kernel_init+0x24/0x140 kernel_init from ret_from_fork+0x14/0x28 Exception stack(0xe0815fb0 to 0xe0815ff8) Prevent this division by 0 by adding an explicit check and error log about the actual issue. While at it, remove the same check from stmmac_ptp_register, which then becomes duplicate

Gravité et risque d'exploitation

CVE-2025-38126 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.19 %, ce qui la place devant 8.5 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <bb033c6781ce1b0264c3993b767b4aa9021959c2, 6.6.94, 0, 6.12.34, <32af9c289234990752281c805500dfe03c5b2b8f, <=6.15.*, <379cd990dfe752b38fcf46034698a9a150626c7a, <=6.6.*, 6.1.142, <4.5, 6.16, <b263088ee8ab14563817a8be3519af8e25225793, <030ce919e114a111e83b7976ecb3597cefd33f26, 19d857c9038e5c07db8f8cc02b5ad0cd0098714f, 6.15.3, <=*, 4.5) est présent sur votre parc.
• Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
• À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
• Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

• https://git.kernel.org/stable/c/32af9c289234990752281c805500dfe03c5b2b8f
• https://git.kernel.org/stable/c/b263088ee8ab14563817a8be3519af8e25225793
• https://git.kernel.org/stable/c/bb033c6781ce1b0264c3993b767b4aa9021959c2
• https://git.kernel.org/stable/c/379cd990dfe752b38fcf46034698a9a150626c7a
• https://git.kernel.org/stable/c/030ce919e114a111e83b7976ecb3597cefd33f26