CVE-2019-19769

Published: 12 December 2019

In the Linux kernel 5.3.10, there is a use-after-free (read) in the perf_trace_lock_acquire function (related to include/trace/events/lock.h).

From the Ubuntu security team

Tristan Madani discovered that the file locking implementation in the Linux kernel contained a race condition. A local attacker could possibly use this to cause a denial of service or expose sensitive information.

Priority

Medium

CVSS 3 base score: 6.7

Status

Notes

first attempted fix was
6d390e4b5d48ec03bb87e63cf0a2bff5f4e116da but that showed
performance issues in synthetic benchmarks, more complex fix is
dcf23ac3e846ca0cf626c155a0e3fcbbcf4fae8a
may be introduced by
16306a61d3b7c433c7a127ec6224867b88ece687
no confirmation that the fixes listed actually address the
reporter's issue
the conservative fix for this issue may be to just apply
6d390e4b5d48ec03bb87e63cf0a2bff5f4e116da

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-19769
• https://bugzilla.kernel.org/show_bug.cgi?id=205705
• https://ubuntu.com/security/notices/USN-4369-1
• https://ubuntu.com/security/notices/USN-4368-1
• NVD
• Launchpad
• Debian