CVE-2021-47456
In the Linux kernel, the following vulnerability has been resolved: can: peak_pci: peak_pci_remove(): fix UAF When remove the module peek_pci, referencing 'chan' again after releasing 'dev' will cause UAF.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.24%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: can: peak_pci: peak_pci_remove(): fix UAF When remove the module peek_pci, referencing 'chan' again after releasing 'dev' will cause UAF. Fix this by releasing 'dev' later. The following log reveals it: [ 35.961814 ] BUG: KASAN: use-after-free in peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.963414 ] Read of size 8 at addr ffff888136998ee8 by task modprobe/5537 [ 35.965513 ] Call Trace: [ 35.965718 ] dump_stack_lvl+0xa8/0xd1 [ 35.966028 ] print_address_description+0x87/0x3b0 [ 35.966420 ] kasan_report+0x172/0x1c0 [ 35.966725 ] ? peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.967137 ] ? trace_irq_enable_rcuidle+0x10/0x170 [ 35.967529 ] ? peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.967945 ] __asan_report_load8_noabort+0x14/0x20 [ 35.968346 ] peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.968752 ] pci_device_remove+0xa9/0x250
- CVSS 3.1
- 8.4 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.24% probability · 15th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416, CWE-467
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0e5afdc2315b0737edcf55bede4ee1640d2d464dPatch
- https://git.kernel.org/stable/c/1248582e47a9f7ce0ecd156c39fc61f8b6aa3699Patch
- https://git.kernel.org/stable/c/1c616528ba4aeb1125a06b407572ab7b56acae38Patch
- https://git.kernel.org/stable/c/28f28e4bc3a5e0051faa963f10b778ab38c1db69Patch
- https://git.kernel.org/stable/c/34914971bb3244db4ce2be44e9438a9b30c56250Patch
- https://git.kernel.org/stable/c/447d44cd2f67a20b596ede3ca3cd67086dfd9ca9Patch
- https://git.kernel.org/stable/c/949fe9b35570361bc6ee2652f89a0561b26eec98Patch
- https://git.kernel.org/stable/c/adbda14730aacce41c0d3596415aa39ad63eafd9Patch
- https://git.kernel.org/stable/c/0e5afdc2315b0737edcf55bede4ee1640d2d464dPatch
- https://git.kernel.org/stable/c/1248582e47a9f7ce0ecd156c39fc61f8b6aa3699Patch
- https://git.kernel.org/stable/c/1c616528ba4aeb1125a06b407572ab7b56acae38Patch
- https://git.kernel.org/stable/c/28f28e4bc3a5e0051faa963f10b778ab38c1db69Patch
- https://git.kernel.org/stable/c/34914971bb3244db4ce2be44e9438a9b30c56250Patch
- https://git.kernel.org/stable/c/447d44cd2f67a20b596ede3ca3cd67086dfd9ca9Patch
- https://git.kernel.org/stable/c/949fe9b35570361bc6ee2652f89a0561b26eec98Patch
- https://git.kernel.org/stable/c/adbda14730aacce41c0d3596415aa39ad63eafd9Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.