CVE-2021-47458

ocfs2: mount fails with buffer overflow in strlen

HIGH

7.8

CVSS Score

Published: May 22, 2024 at 06:19 AM UTC

Updated: August 5, 2026 at 09:24 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

v < 4.4.2903.14 ≤ v < 4.14.2533.14 ≤ v < 4.19.2143.14 ≤ v < 4.4.2903.14 ≤ v < 4.9.2883.14 ≤ v < 5.10.763.14 ≤ v < 5.14.153.14 ≤ v < 5.153.14 ≤ v < 5.4.1564.10 ≤ v < 4.14.2534.15 ≤ v < 4.19.2144.20 ≤ v < 5.4.1564.5 ≤ v < 4.9.2885.11 ≤ v < 5.14.155.5 ≤ v < 5.10.765.15 rc1 5.15 rc2 5.15 rc3 5.15 rc4 5.15 rc5 5.15 rc6c74a3bdd9b529d924d1abf986079b783dd105ace

Vendor states this is fixed in 0e677ea5b7396f715a76b6b0ef441430e4c4b57f (fixed)

Vendor states this is fixed in 232ed9752510de4436468b653d145565669c8498 (fixed)

Vendor states this is fixed in 4b74ddcc22ee6455946e80a9c4808801f8f8561e (fixed)

Vendor states this is fixed in 7623b1035ca2d17bde0f6a086ad6844a34648df1 (fixed)

Vendor states this is fixed in 93be0eeea14cf39235e585c8f56df3b3859deaad (fixed)

Vendor states this is fixed in ac011cb3ff7a76b3e0e6e77158ee4ba2f929e1fb (fixed)

Vendor states this is fixed in b15fa9224e6e1239414525d8d556d824701849fc (fixed)

Vendor states this is fixed in d3a83576378b4c904f711598dde2c5e881c4295c (fixed)

Vendor states this is fixed in 3.14 (unaffected)

Vendor states this is fixed in 4.14.253 (unaffected)

Vendor states this is fixed in 4.19.214 (unaffected)

Vendor states this is fixed in 4.4.290 (unaffected)