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CVE-2024-26875

Vulnérabilité moyenne dans Linux (Linux)

CVSS 6.4 · Moyenne
EPSS 0.2%
Linux•Linux•Versions : 6.9, <=6.1.*, <3a1ec89708d2e57e2712f46241282961b1a7a475, <eaa410e05bdf562c90b23cdf2d9327f9c4625e16, <eb6e9dce979c08210ff7249e5e0eceb8991bfcd7, 0, 4.19.311, 6.1.83, 6.7.11, 5.15.153, <ed8000e1e8e9684ab6c30cf2b526c0cea039929c, <2.6.26, <ab896d93fd6a2cd1afeb034c3cc9226cb499209f, <=5.10.*, <=6.6.*, 6.8.2, 5.4.273, <=5.4.*, e5be15c63804e05b5a94197524023702a259e308, <=4.19.*, <d29ed08964cec8b9729bc55c7bb23f679d7a18fb, <=6.8.*, 6.6.23, <8e60b99f6b7ccb3badeb512f5eb613ad45904592, 5.10.214, <0a0b79ea55de8514e1750884e5fec77f9fdd01ee, <=*, <=5.15.*, <=6.7.*, <40cd818fae875c424a8335009db33c7b5a07de3a, 2.6.26

Description

In the Linux kernel, the following vulnerability has been resolved: media: pvrusb2: fix uaf in pvr2_context_set_notify [Syzbot reported] BUG: KASAN: slab-use-after-free in pvr2_context_set_notify+0x2c4/0x310 drivers/media/usb/pvrusb2/pvrusb2-context.c:35 Read of size 4 at addr ffff888113aeb0d8 by task kworker/1:1/26 CPU: 1 PID: 26 Comm: kworker/1:1 Not tainted 6.8.0-rc1-syzkaller-00046-gf1a27f081c1f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: usb_hub_wq hub_event Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 pvr2_context_set_notify+0x2c4/0x310 drivers/media/usb/pvrusb2/pvrusb2-context.c:35 pvr2_context_notify drivers/media/usb/pvrusb2/pvrusb2-context.c:95 [inline] pvr2_context_disconnect+0x94/0xb0 drivers/media/usb/pvrusb2/pvrusb2-context.c:272 Freed by task 906: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:640 poison_slab_object mm/kasan/common.c:241 [inline] __kasan_slab_free+0x106/0x1b0 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x105/0x340 mm/slub.c:4409 pvr2_context_check drivers/media/usb/pvrusb2/pvrusb2-context.c:137 [inline] pvr2_context_thread_func+0x69d/0x960 drivers/media/usb/pvrusb2/pvrusb2-context.c:158 [Analyze] Task A set disconnect_flag = !0, which resulted in Task B's condition being met and releasing mp, leading to this issue. [Fix] Place the disconnect_flag assignment operation after all code in pvr2_context_disconnect() to avoid this issue.

Gravité et risque d'exploitation

CVE-2024-26875 obtient un score CVSS de 6.4/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.25 %, ce qui la place devant 14.9 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 6.9, <=6.1.*, <3a1ec89708d2e57e2712f46241282961b1a7a475, <eaa410e05bdf562c90b23cdf2d9327f9c4625e16, <eb6e9dce979c08210ff7249e5e0eceb8991bfcd7, 0, 4.19.311, 6.1.83, 6.7.11, 5.15.153, <ed8000e1e8e9684ab6c30cf2b526c0cea039929c, <2.6.26, <ab896d93fd6a2cd1afeb034c3cc9226cb499209f, <=5.10.*, <=6.6.*, 6.8.2, 5.4.273, <=5.4.*, e5be15c63804e05b5a94197524023702a259e308, <=4.19.*, <d29ed08964cec8b9729bc55c7bb23f679d7a18fb, <=6.8.*, 6.6.23, <8e60b99f6b7ccb3badeb512f5eb613ad45904592, 5.10.214, <0a0b79ea55de8514e1750884e5fec77f9fdd01ee, <=*, <=5.15.*, <=6.7.*, <40cd818fae875c424a8335009db33c7b5a07de3a, 2.6.26) 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

Rechercher une autre CVE