Bug 1905155 (CVE-2020-27825) - CVE-2020-27825 kernel: use-after-free in the ftrace ring buffer resizing logic due to a race condition
Summary: CVE-2020-27825 kernel: use-after-free in the ftrace ring buffer resizing logi...
Keywords:
Status: NEW
Alias: CVE-2020-27825
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Nobody
QA Contact:
URL:
Whiteboard:
Depends On: 1906409 1906410 1914746 1914747 1914748
Blocks: 1899203
TreeView+ depends on / blocked
 
Reported: 2020-12-07 16:26 UTC by Guilherme de Almeida Suckevicz
Modified: 2024-01-19 19:11 UTC (History)
39 users (show)

Fixed In Version: kernel 5.10-rc1
Doc Type: If docs needed, set a value
Doc Text:
A use-after-free flaw was found in kernel/trace/ring_buffer.c in Linux kernel. There was a race problem in trace_open and resize of cpu buffer running parallely on different cpus, may cause a denial of service problem (DOS). This flaw could even allow a local attacker with special user privilege to a kernel information leak threat.
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Description Guilherme de Almeida Suckevicz 2020-12-07 16:26:05 UTC 
A flaw was found in the Linux Kernel. A use-after-free vulnerability was discovered in the ftrace ring buffer resizing logic due to a race condition.

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bbeb97464eefc65f506084fd9f18f21653e01137
Comment 3 Rohit Keshri 2020-12-09 13:11:36 UTC 
Mitigation:

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Comment 4 Guilherme de Almeida Suckevicz 2020-12-09 19:58:29 UTC 
Acknowledgments:

Name: Adam 'pi3' Zabrocki
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