CVE-2021-47458

ocfs2: mount fails with buffer overflow in strlen

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: mount fails with buffer overflow in strlen Starting with kernel 5.11 built with CONFIG_FORTIFY_SOURCE mouting an ocfs2 filesystem with either o2cb or pcmk cluster stack fails with the trace below. Problem seems to be that strings for cluster stack and cluster name are not guaranteed to be null terminated in the disk representation, while strlcpy assumes that the source string is always null terminated. This causes a read outside of the source string triggering the buffer overflow detection. detected buffer overflow in strlen ------------[ cut here ]------------ kernel BUG at lib/string.c:1149! invalid opcode: 0000 [#1] SMP PTI CPU: 1 PID: 910 Comm: mount.ocfs2 Not tainted 5.14.0-1-amd64 #1 Debian 5.14.6-2 RIP: 0010:fortify_panic+0xf/0x11 ... Call Trace: ocfs2_initialize_super.isra.0.cold+0xc/0x18 [ocfs2] ocfs2_fill_super+0x359/0x19b0 [ocfs2] mount_bdev+0x185/0x1b0 legacy_get_tree+0x27/0x40 vfs_get_tree+0x25/0xb0 path_mount+0x454/0xa20 __x64_sys_mount+0x103/0x140 do_syscall_64+0x3b/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae

N/A
CVSS
Severity:
EPSS 0.11%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/ac011cb3ff7a76b3e0e6e77158ee4ba2f929e1fb
https://git.kernel.org/stable/c/4b74ddcc22ee6455946e80a9c4808801f8f8561e
https://git.kernel.org/stable/c/232ed9752510de4436468b653d145565669c8498
https://git.kernel.org/stable/c/7623b1035ca2d17bde0f6a086ad6844a34648df1
https://git.kernel.org/stable/c/d3a83576378b4c904f711598dde2c5e881c4295c
https://git.kernel.org/stable/c/93be0eeea14cf39235e585c8f56df3b3859deaad
https://git.kernel.org/stable/c/0e677ea5b7396f715a76b6b0ef441430e4c4b57f
https://git.kernel.org/stable/c/b15fa9224e6e1239414525d8d556d824701849fc

Frequently Asked Questions

What is the severity of CVE-2021-47458?
CVE-2021-47458 has not yet been assigned a CVSS score.
How to fix CVE-2021-47458?
To fix CVE-2021-47458, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47458 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47458 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47458?
CVE-2021-47458 affects Linux Linux, Linux Linux.
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