CVE-2022-48714
In the Linux kernel, the following vulnerability has been resolved: bpf: Use VM_MAP instead of VM_ALLOC for ringbuf After commit 2fd3fb0be1d1 ("kasan, vmalloc: unpoison VM_ALLOC pages after mapping"), non-VM_ALLOC mappings will be marked as accessible…
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: bpf: Use VM_MAP instead of VM_ALLOC for ringbuf After commit 2fd3fb0be1d1 ("kasan, vmalloc: unpoison VM_ALLOC pages after mapping"), non-VM_ALLOC mappings will be marked as accessible in __get_vm_area_node() when KASAN is enabled. But now the flag for ringbuf area is VM_ALLOC, so KASAN will complain out-of-bound access after vmap() returns. Because the ringbuf area is created by mapping allocated pages, so use VM_MAP instead. After the change, info in /proc/vmallocinfo also changes from [start]-[end] 24576 ringbuf_map_alloc+0x171/0x290 vmalloc user to [start]-[end] 24576 ringbuf_map_alloc+0x171/0x290 vmap user
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.24% probability · 15th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/5e457aeab52a5947619e1f18047f4d2f3212b3ebPatch
- https://git.kernel.org/stable/c/6304a613a97d6dcd49b93fbad31e9f39d1e138d6Patch
- https://git.kernel.org/stable/c/b293dcc473d22a62dc6d78de2b15e4f49515db56Patch
- https://git.kernel.org/stable/c/d578933f6226d5419af9306746efa1c693cbaf9cPatch
- https://git.kernel.org/stable/c/5e457aeab52a5947619e1f18047f4d2f3212b3ebPatch
- https://git.kernel.org/stable/c/6304a613a97d6dcd49b93fbad31e9f39d1e138d6Patch
- https://git.kernel.org/stable/c/b293dcc473d22a62dc6d78de2b15e4f49515db56Patch
- https://git.kernel.org/stable/c/d578933f6226d5419af9306746efa1c693cbaf9cPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.