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CVE-2024-26875

media: pvrusb2: fix uaf in pvr2_context_set_notify

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.19.311, 5.4.273, 5.10.214, 5.15.153, 6.1.83, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From e5be15c63804e05b5a94197524023702a259e308 · fixed in ed8000e1e8e9684ab6c30cf2b526c0cea039929c; From e5be15c63804e05b5a94197524023702a259e308 · fixed in d29ed08964cec8b9729bc55c7bb23f679d7a18fb; From e5be15c63804e05b5a94197524023702a259e308 · fixed in ab896d93fd6a2cd1afeb034c3cc9226cb499209f; From e5be15c63804e05b5a94197524023702a259e308 · fixed in eb6e9dce979c08210ff7249e5e0eceb8991bfcd7; From e5be15c63804e05b5a94197524023702a259e308 · fixed in 3a1ec89708d2e57e2712f46241282961b1a7a475; From e5be15c63804e05b5a94197524023702a259e308 · fixed in 8e60b99f6b7ccb3badeb512f5eb613ad45904592; From e5be15c63804e05b5a94197524023702a259e308 · fixed in 40cd818fae875c424a8335009db33c7b5a07de3a; From e5be15c63804e05b5a94197524023702a259e308 · fixed in eaa410e05bdf562c90b23cdf2d9327f9c4625e16; From e5be15c63804e05b5a94197524023702a259e308 · fixed in 0a0b79ea55de8514e1750884e5fec77f9fdd01ee

  • Linux Linux

    2.6.26

  • KernelLinux

    From 2.6.26 · fixed in 4.19.311; From 4.20.0 · fixed in 5.4.273; From 5.5.0 · fixed in 5.10.214; From 5.11.0 · fixed in 5.15.153; From 5.16.0 · fixed in 6.1.83; From 6.2.0 · fixed in 6.6.23; From 6.7.0 · fixed in 6.7.11; From 6.8.0 · fixed in 6.8.2

References 9

git.kernel.org