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Bug 1636349 - (CVE-2018-17972) CVE-2018-17972 kernel: Unprivileged users able to inspect kernel stacks of arbitrary tasks
CVE-2018-17972 kernel: Unprivileged users able to inspect kernel stacks of ar...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180927,repor...
: Security
Depends On: 1636354 1636355 1638193 1638194 1638195 1638196 1638197 1642401 1642774 1636352 1642400
Blocks: 1636382
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Reported: 2018-10-05 04:16 EDT by Andrej Nemec
Modified: 2018-10-25 00:35 EDT (History)
50 users (show)

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Doc Text:
An issue was discovered in the proc_pid_stack function in fs/proc/base.c in the Linux kernel. An attacker with a local account can trick the stack unwinder code to leak stack contents to userspace. The fix allows only root to inspect the kernel stack of an arbitrary task.
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Description Andrej Nemec 2018-10-05 04:16:09 EDT 
An issue was discovered in the proc_pid_stack function in fs/proc/base.c in the Linux kernel .  An attacker with a local account can trick the stack unwinder code to leak stack contents to userspace. The fix allows only root may inspect the kernel stack of an arbitrary task.

Upstream patch:

https://marc.info/?l=linux-fsdevel&m=153806242024956&w=2
Comment 1 Andrej Nemec 2018-10-05 04:18:16 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1636352]
Comment 6 Fedora Update System 2018-10-16 08:09:11 EDT 
kernel-4.18.13-100.fc27, kernel-headers-4.18.13-100.fc27, kernel-tools-4.18.13-100.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.
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