Use After Free Affecting kernel-kdump package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL6-KERNELKDUMP-6640589
- published18 Apr 2024
- disclosed17 Apr 2024
Introduced: 17 Apr 2024
CVE-2024-26875 (opens in a new tab)How to fix?
There is no fixed version for RHEL:6 kernel-kdump.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-kdump package and not the kernel-kdump package as distributed by RHEL.
See How to fix? for RHEL:6 relevant fixed versions and status.
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.
References
- https://access.redhat.com/security/cve/CVE-2024-26875
- 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://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html