CVE-2021-4149

A vulnerability was found in btrfs_alloc_tree_b in fs/btrfs/extent-tree.c in the Linux kernel due to an improper lock operation in btrfs. In this flaw, a user with a local privilege may cause a denial of service (DOS) due to a deadlock problem.

• CWE-667
• CWE-667

• https://bugzilla.redhat.com/show_bug.cgi?id=2026485Issue Tracking, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/07/msg00000.htmlMailing List, Third Party Advisory
• https://lkml.org/lkml/2021/10/18/885Exploit, Mailing List, Patch, Third Party Advisory
• https://lkml.org/lkml/2021/9/13/2565Exploit, Mailing List, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2026485Issue Tracking, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/07/msg00000.htmlMailing List, Third Party Advisory
• https://lkml.org/lkml/2021/10/18/885Exploit, Mailing List, Patch, Third Party Advisory
• https://lkml.org/lkml/2021/9/13/2565Exploit, Mailing List, Third Party Advisory

Published

Mar 23, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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