Bug 1614061 (CVE-2018-5995) - CVE-2018-5995 kernel: Information Exposure through dmesg data from a "pages/cpu" printk call
Summary: CVE-2018-5995 kernel: Information Exposure through dmesg data from a "pages/c...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2018-5995
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 1614058
TreeView+ depends on / blocked
 
Reported: 2018-08-08 22:24 UTC by Laura Pardo
Modified: 2021-02-16 23:48 UTC (History)
52 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
An information-exposure flaw was found in the Linux kernel where the pcpu_embed_first_chunk() function in mm/percpu.c allows local users to obtain kernel-object address information by reading the kernel log (dmesg). However, this address is not static and cannot be used to commit a further attack.
Clone Of:
Environment:
Last Closed: 2018-08-09 16:09:19 UTC
Embargoed:

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Description Laura Pardo 2018-08-08 22:24:11 UTC 
A flaw was found in the Linux kernel that pcpu_embed_first_chunk() function in mm/percpu.c allows local users to obtain some kernel address information by reading the kernel log (dmesg). This address is not useful to commit a further attack.

References:

https://github.com/johnsonwangqize/cve-linux/blob/master/CVE-2018-5995.md

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad67b74d2469d
Comment 3 Vladis Dronov 2018-08-09 16:09:19 UTC 
Notes:

The kernel addresses revealed in the kernel log are of the kernel objects which are allocated dynamically and does not give an information about the kernel code or objects location and so are useless for a possible attacker.
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