| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-26875: media: pvrusb2: fix uaf in pvr2_context_set_notify |
| |
| 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. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26875 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.26 with commit e5be15c63804e05b5a94197524023702a259e308 and fixed in 4.19.311 with commit ed8000e1e8e9684ab6c30cf2b526c0cea039929c |
| Issue introduced in 2.6.26 with commit e5be15c63804e05b5a94197524023702a259e308 and fixed in 5.4.273 with commit d29ed08964cec8b9729bc55c7bb23f679d7a18fb |
| Issue introduced in 2.6.26 with commit e5be15c63804e05b5a94197524023702a259e308 and fixed in 5.10.214 with commit ab896d93fd6a2cd1afeb034c3cc9226cb499209f |
| Issue introduced in 2.6.26 with commit e5be15c63804e05b5a94197524023702a259e308 and fixed in 5.15.153 with commit eb6e9dce979c08210ff7249e5e0eceb8991bfcd7 |
| Issue introduced in 2.6.26 with commit e5be15c63804e05b5a94197524023702a259e308 and fixed in 6.1.83 with commit 3a1ec89708d2e57e2712f46241282961b1a7a475 |
| Issue introduced in 2.6.26 with commit e5be15c63804e05b5a94197524023702a259e308 and fixed in 6.6.23 with commit 8e60b99f6b7ccb3badeb512f5eb613ad45904592 |
| Issue introduced in 2.6.26 with commit e5be15c63804e05b5a94197524023702a259e308 and fixed in 6.7.11 with commit 40cd818fae875c424a8335009db33c7b5a07de3a |
| Issue introduced in 2.6.26 with commit e5be15c63804e05b5a94197524023702a259e308 and fixed in 6.8.2 with commit eaa410e05bdf562c90b23cdf2d9327f9c4625e16 |
| Issue introduced in 2.6.26 with commit e5be15c63804e05b5a94197524023702a259e308 and fixed in 6.9 with commit 0a0b79ea55de8514e1750884e5fec77f9fdd01ee |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-26875 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/media/usb/pvrusb2/pvrusb2-context.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/ed8000e1e8e9684ab6c30cf2b526c0cea039929c |
| https://git.kernel.org/stable/c/d29ed08964cec8b9729bc55c7bb23f679d7a18fb |
| https://git.kernel.org/stable/c/ab896d93fd6a2cd1afeb034c3cc9226cb499209f |
| https://git.kernel.org/stable/c/eb6e9dce979c08210ff7249e5e0eceb8991bfcd7 |
| https://git.kernel.org/stable/c/3a1ec89708d2e57e2712f46241282961b1a7a475 |
| https://git.kernel.org/stable/c/8e60b99f6b7ccb3badeb512f5eb613ad45904592 |
| https://git.kernel.org/stable/c/40cd818fae875c424a8335009db33c7b5a07de3a |
| https://git.kernel.org/stable/c/eaa410e05bdf562c90b23cdf2d9327f9c4625e16 |
| https://git.kernel.org/stable/c/0a0b79ea55de8514e1750884e5fec77f9fdd01ee |
