CVE-2021-47458
ocfs2: mount fails with buffer overflow in strlen
- Published
- Updated
- Reserved
- Assigned by
- Linux
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
Timeline
ID reserved
By Linux
- 1 day later
· 1 day later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.25% · top 84% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Weakness
Affected products
- affected c74a3bdd9b529d924d1abf986079b783dd105ace – < ac011cb3ff7a76b3e0e6e77158ee4ba2f929e1fb
- affected c74a3bdd9b529d924d1abf986079b783dd105ace – < 4b74ddcc22ee6455946e80a9c4808801f8f8561e
- affected c74a3bdd9b529d924d1abf986079b783dd105ace – < 232ed9752510de4436468b653d145565669c8498
- affected c74a3bdd9b529d924d1abf986079b783dd105ace – < 7623b1035ca2d17bde0f6a086ad6844a34648df1
- affected c74a3bdd9b529d924d1abf986079b783dd105ace – < d3a83576378b4c904f711598dde2c5e881c4295c
- affected c74a3bdd9b529d924d1abf986079b783dd105ace – < 93be0eeea14cf39235e585c8f56df3b3859deaad
- affected c74a3bdd9b529d924d1abf986079b783dd105ace – < 0e677ea5b7396f715a76b6b0ef441430e4c4b57f
- affected c74a3bdd9b529d924d1abf986079b783dd105ace – < b15fa9224e6e1239414525d8d556d824701849fc
- affected 3.14
- unaffected < 3.14
- unaffected 4.4.290 – ≤ 4.4.*
- unaffected 4.9.288 – ≤ 4.9.*
- unaffected 4.14.253 – ≤ 4.14.*
- unaffected 4.19.214 – ≤ 4.19.*
- unaffected 5.4.156 – ≤ 5.4.*
- unaffected 5.10.76 – ≤ 5.10.*
- unaffected 5.14.15 – ≤ 5.14.*
- unaffected 5.15 – ≤ *
References (8)
- https://git.kernel.org/stable/c/ac011cb3ff7a76b3e0e6e77158ee4ba2f929e1fb (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/4b74ddcc22ee6455946e80a9c4808801f8f8561e (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/232ed9752510de4436468b653d145565669c8498 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/7623b1035ca2d17bde0f6a086ad6844a34648df1 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/d3a83576378b4c904f711598dde2c5e881c4295c (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/93be0eeea14cf39235e585c8f56df3b3859deaad (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/0e677ea5b7396f715a76b6b0ef441430e4c4b57f (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/b15fa9224e6e1239414525d8d556d824701849fc (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-47458)Record last updated .