CVE-2023-53475

Description

In the Linux kernel, the following vulnerability has been resolved: usb: xhci: tegra: fix sleep in atomic call When we set the dual-role port to Host mode, we observed the following splat: [ 167.057718] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:229 [ 167.057872] Workqueue: events tegra_xusb_usb_phy_work [ 167.057954] Call trace: [ 167.057962] dump_backtrace+0x0/0x210 [ 167.057996] show_stack+0x30/0x50 [ 167.058020] dump_stack_lvl+0x64/0x84 [ 167.058065] dump_stack+0x14/0x34 [ 167.058100] __might_resched+0x144/0x180 [ 167.058140] __might_sleep+0x64/0xd0 [ 167.058171] slab_pre_alloc_hook.constprop.0+0xa8/0x110 [ 167.058202] __kmalloc_track_caller+0x74/0x2b0 [ 167.058233] kvasprintf+0xa4/0x190 [ 167.058261] kasprintf+0x58/0x90 [ 167.058285] tegra_xusb_find_port_node.isra.0+0x58/0xd0 [ 167.058334] tegra_xusb_find_port+0x38/0xa0 [ 167.058380] tegra_xusb_padctl_get_usb3_companion+0x38/0xd0 [ 167.058430] tegra_xhci_id_notify+0x8c/0x1e0 [ 167.058473] notifier_call_chain+0x88/0x100 [ 167.058506] atomic_notifier_call_chain+0x44/0x70 [ 167.058537] tegra_xusb_usb_phy_work+0x60/0xd0 [ 167.058581] process_one_work+0x1dc/0x4c0 [ 167.058618] worker_thread+0x54/0x410 [ 167.058650] kthread+0x188/0x1b0 [ 167.058672] ret_from_fork+0x10/0x20 The function tegra_xusb_padctl_get_usb3_companion eventually calls tegra_xusb_find_port and this in turn calls kasprintf which might sleep and so cannot be called from an atomic context. Fix this by moving the call to tegra_xusb_padctl_get_usb3_companion to the tegra_xhci_id_work function where it is really needed.

Gravité et risque d'exploitation

CVE-2023-53475 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 0.15 %, ce qui la place devant 4.3 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions 6.2.11, <1fe6015aa92cc0dfd875c1d3c7c1750a1b0767d9, <=6.1.*, f836e7843036fbf34320356e156cd4267fa5bfa2, 5.15.107, 0, 6.1.24, <5.7, <=5.10.*, <130c61c516cd0684282a8f6ab163281d60642fc5, 6.3, <b4b4f17aa46c025da77aed5133b08971959c9684, <1122474b757a5dd8b2b50008a97f33cdb10dff6e, <=6.2.*, 5.7, <=*, <=5.15.*, 5.10.178, <4c7f9d2e413dc06a157c4e5dccde84aaf4655eb3) 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/b4b4f17aa46c025da77aed5133b08971959c9684
• https://git.kernel.org/stable/c/1122474b757a5dd8b2b50008a97f33cdb10dff6e
• https://git.kernel.org/stable/c/130c61c516cd0684282a8f6ab163281d60642fc5
• https://git.kernel.org/stable/c/1fe6015aa92cc0dfd875c1d3c7c1750a1b0767d9
• https://git.kernel.org/stable/c/4c7f9d2e413dc06a157c4e5dccde84aaf4655eb3