Linux: Out-of-bounds Read
CVE-2022-48714 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 6304a613a97d6dcd49b93fbad31e9f39d1e138d6, 5e457aeab52a5947619e1f18047f4d2f3212b3eb, d578933f6226d5419af9306746efa1c693cbaf9c as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.24% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to 6304a613a97d6dcd49b93fbad31e9f39d1e138d6 or 5e457aeab52a5947619e1f18047f4d2f3212b3eb or d578933f6226d5419af9306746efa1c693cbaf9c or b293dcc473d22a62dc6d78de2b15e4f49515db56, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.10.99 or 5.15.22 or 5.16.8, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 457f44363a8894135c85b7a9afd2bd8196db24ab up to, but not including, 6304a613a97d6dcd49b93fbad31e9f39d1e138d6; 457f44363a8894135c85b7a9afd2bd8196db24ab up to, but not including, 5e457aeab52a5947619e1f18047f4d2f3212b3eb; 457f44363a8894135c85b7a9afd2bd8196db24ab up to, but not including, d578933f6226d5419af9306746efa1c693cbaf9c; 457f44363a8894135c85b7a9afd2bd8196db24ab up to, but not including, b293dcc473d22a62dc6d78de2b15e4f49515db56; 5.8 | 6304a613a97d6dcd49b93fbad31e9f39d1e138d6, 5e457aeab52a5947619e1f18047f4d2f3212b3eb, d578933f6226d5419af9306746efa1c693cbaf9c, b293dcc473d22a62dc6d78de2b15e4f49515db56 |
| Linux | Linux Kernel | 5.8 up to, but not including, 5.10.99; 5.11 up to, but not including, 5.15.22; 5.16 up to, but not including, 5.16.8; 5.17 | 5.10.99, 5.15.22, 5.16.8 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.
Official 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
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Recent Out-of-bounds Read vulnerabilities
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
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