Improper Locking Affecting kernel-debug-core package, versions <0:4.18.0-240.15.1.el8_3
Threat Intelligence
EPSS
0.05% (18th
percentile)
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Test your applications- Snyk ID SNYK-RHEL8-KERNELDEBUGCORE-3956672
- published 26 Jul 2021
- disclosed 4 Dec 2020
How to fix?
Upgrade RHEL:8 kernel-debug-core to version 0:4.18.0-240.15.1.el8_3 or higher.
This issue was patched in RHSA-2021:0558.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug-core package and not the kernel-debug-core package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_jobctrl.c allows a use-after-free attack against TIOCSPGRP, aka CID-54ffccbf053b.
References
- https://security.netapp.com/advisory/ntap-20210122-0001/
- https://access.redhat.com/security/cve/CVE-2020-29661
- https://www.debian.org/security/2021/dsa-4843
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BOB25SU6XUL4TNP7KB63WNZSYTIYFDPP/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MZ7OAKAEFAXQRGBZK4LYUWINCD3D2XCL/
- http://packetstormsecurity.com/files/160681/Linux-TIOCSPGRP-Broken-Locking.html
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54ffccbf053b5b6ca4f6e45094b942fab92a25fc
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
- https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
- http://www.openwall.com/lists/oss-security/2020/12/10/1
- https://access.redhat.com/errata/RHSA-2021:0558
- http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BOB25SU6XUL4TNP7KB63WNZSYTIYFDPP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MZ7OAKAEFAXQRGBZK4LYUWINCD3D2XCL/
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