CVE-2024-26875

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe5be15c63804e05b5a94197524023702a259e308 < ed8000e1e8e9684ab6c30cf2b526c0cea039929caffected
LinuxLinuxe5be15c63804e05b5a94197524023702a259e308 < d29ed08964cec8b9729bc55c7bb23f679d7a18fbaffected
LinuxLinuxe5be15c63804e05b5a94197524023702a259e308 < ab896d93fd6a2cd1afeb034c3cc9226cb499209faffected
LinuxLinuxe5be15c63804e05b5a94197524023702a259e308 < eb6e9dce979c08210ff7249e5e0eceb8991bfcd7affected
LinuxLinuxe5be15c63804e05b5a94197524023702a259e308 < 3a1ec89708d2e57e2712f46241282961b1a7a475affected
LinuxLinuxe5be15c63804e05b5a94197524023702a259e308 < 8e60b99f6b7ccb3badeb512f5eb613ad45904592affected
LinuxLinuxe5be15c63804e05b5a94197524023702a259e308 < 40cd818fae875c424a8335009db33c7b5a07de3aaffected
LinuxLinuxe5be15c63804e05b5a94197524023702a259e308 < eaa410e05bdf562c90b23cdf2d9327f9c4625e16affected
LinuxLinuxe5be15c63804e05b5a94197524023702a259e308 < 0a0b79ea55de8514e1750884e5fec77f9fdd01eeaffected
LinuxLinux2.6.26affected
LinuxLinux0 < 2.6.26unaffected
LinuxLinux4.19.311 <= 4.19.*unaffected
LinuxLinux5.4.273 <= 5.4.*unaffected
LinuxLinux5.10.214 <= 5.10.*unaffected
LinuxLinux5.15.153 <= 5.15.*unaffected
LinuxLinux6.1.83 <= 6.1.*unaffected
LinuxLinux6.6.23 <= 6.6.*unaffected
LinuxLinux6.7.11 <= 6.7.*unaffected
LinuxLinux6.8.2 <= 6.8.*unaffected
LinuxLinux6.9 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

Additional References

References