UBUNTU-CVE-2024-26875
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.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
29 explicit affected versions
43 explicit affected versions
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6 explicit affected versions
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19 explicit affected versions
6 explicit affected versions
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4 explicit affected versions
38 explicit affected versions
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38 explicit affected versions
10 explicit affected versions
3 explicit affected versions
45 explicit affected versions
191 explicit affected versions
7 explicit affected versions
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88 explicit affected versions
13 explicit affected versions
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35 explicit affected versions
5 explicit affected versions
14 explicit affected versions
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7 explicit affected versions
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33 explicit affected versions
5 explicit affected versions
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13 explicit affected versions
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23 explicit affected versions
7 explicit affected versions
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10 explicit affected versions
45 explicit affected versions
5 explicit affected versions
7 explicit affected versions
12 explicit affected versions
111 explicit affected versions
36 explicit affected versions
12 explicit affected versions
14 explicit affected versions
7 explicit affected versions
78 explicit affected versions
12 explicit affected versions
93 explicit affected versions
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12 explicit affected versions
89 explicit affected versions
120 explicit affected versions
10 explicit affected versions
10 explicit affected versions
37 explicit affected versions
13 explicit affected versions
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25 explicit affected versions
1 explicit affected versions
31 explicit affected versions
26 explicit affected versions
13 explicit affected versions
144 explicit affected versions
4 explicit affected versions
1 explicit affected versions
29 explicit affected versions
81 explicit affected versions
13 explicit affected versions
49 explicit affected versions
1 explicit affected versions
77 explicit affected versions
47 explicit affected versions
93 explicit affected versions
9 explicit affected versions
33 explicit affected versions
23 explicit affected versions
10 explicit affected versions
188 explicit affected versions
11 explicit affected versions
12 explicit affected versions
7 explicit affected versions
12 explicit affected versions
92 explicit affected versions
138 explicit affected versions
2 explicit affected versions
37 explicit affected versions
30 explicit affected versions
132 explicit affected versions
46 explicit affected versions
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154 explicit affected versions
10 explicit affected versions
26 explicit affected versions
6 explicit affected versions
27 explicit affected versions
1 explicit affected versions
6 explicit affected versions
13 explicit affected versions
5 explicit affected versions
139 explicit affected versions
51 explicit affected versions
16 explicit affected versions
49 explicit affected versions
6 explicit affected versions
39 explicit affected versions
116 explicit affected versions
3 explicit affected versions
93 explicit affected versions
1 explicit affected versions
2 explicit affected versions
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51 explicit affected versions
92 explicit affected versions
3 explicit affected versions
12 explicit affected versions
35 explicit affected versions
27 explicit affected versions
21 explicit affected versions
1 explicit affected versions
1 explicit affected versions
98 explicit affected versions
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10 explicit affected versions
5 explicit affected versions
8 explicit affected versions
1 explicit affected versions
10 explicit affected versions
2 explicit affected versions
13 explicit affected versions
81 explicit affected versions
13 explicit affected versions
45 explicit affected versions
7 explicit affected versions
140 explicit affected versions
94 explicit affected versions
41 explicit affected versions
10 explicit affected versions
12 explicit affected versions
12 explicit affected versions
80 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
35 explicit affected versions
37 explicit affected versions
6 explicit affected versions
14 explicit affected versions
38 explicit affected versions
167 explicit affected versions
39 explicit affected versions
9 explicit affected versions
38 explicit affected versions
11 explicit affected versions
46 explicit affected versions
7 explicit affected versions
20 explicit affected versions
97 explicit affected versions
52 explicit affected versions
121 explicit affected versions
4 explicit affected versions
1 explicit affected versions
1 explicit affected versions
44 explicit affected versions
13 explicit affected versions
43 explicit affected versions
46 explicit affected versions
10 explicit affected versions
8 explicit affected versions
1 explicit affected versions
14 explicit affected versions
81 explicit affected versions
4 explicit affected versions
70 explicit affected versions
11 explicit affected versions
1 explicit affected versions
69 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/0a0b79ea55de8514e1750884e5fec77f9fdd01ee
- https://git.kernel.org/stable/c/0a0b79ea55de8514e1750884e5fec77f9fdd01ee
- https://git.kernel.org/stable/c/3a1ec89708d2e57e2712f46241282961b1a7a475
- https://git.kernel.org/stable/c/40cd818fae875c424a8335009db33c7b5a07de3a
- https://git.kernel.org/stable/c/8e60b99f6b7ccb3badeb512f5eb613ad45904592
- https://git.kernel.org/stable/c/ab896d93fd6a2cd1afeb034c3cc9226cb499209f
- https://git.kernel.org/stable/c/d29ed08964cec8b9729bc55c7bb23f679d7a18fb
- https://git.kernel.org/stable/c/eaa410e05bdf562c90b23cdf2d9327f9c4625e16
- https://git.kernel.org/stable/c/eb6e9dce979c08210ff7249e5e0eceb8991bfcd7
- https://git.kernel.org/stable/c/ed8000e1e8e9684ab6c30cf2b526c0cea039929c
- https://ubuntu.com/security/CVE-2024-26875
- https://ubuntu.com/security/notices/USN-6816-1
- https://ubuntu.com/security/notices/USN-6817-1
- https://ubuntu.com/security/notices/USN-6817-2
- https://ubuntu.com/security/notices/USN-6817-3
- https://ubuntu.com/security/notices/USN-6820-1
- https://ubuntu.com/security/notices/USN-6820-2
- https://ubuntu.com/security/notices/USN-6821-1
- https://ubuntu.com/security/notices/USN-6821-2
- https://ubuntu.com/security/notices/USN-6821-3
- https://ubuntu.com/security/notices/USN-6821-4
- https://ubuntu.com/security/notices/USN-6828-1
- https://ubuntu.com/security/notices/USN-6871-1
- https://ubuntu.com/security/notices/USN-6878-1
- https://ubuntu.com/security/notices/USN-6892-1
- https://ubuntu.com/security/notices/USN-6896-1
- https://ubuntu.com/security/notices/USN-6896-2
- https://ubuntu.com/security/notices/USN-6896-3
- https://ubuntu.com/security/notices/USN-6896-4
- https://ubuntu.com/security/notices/USN-6896-5
- https://ubuntu.com/security/notices/USN-6919-1
- https://www.cve.org/CVERecord?id=CVE-2024-26875