CVE-2021-47458

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2024-05-22. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

May 22, 2024

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

ocfs2: mount fails with buffer overflow in strlen - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/232ed9752510de4436468b653d145565669c8498
generic

ocfs2: mount fails with buffer overflow in strlen - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0e677ea5b7396f715a76b6b0ef441430e4c4b57f
generic

ocfs2: mount fails with buffer overflow in strlen - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d3a83576378b4c904f711598dde2c5e881c4295c
generic

ocfs2: mount fails with buffer overflow in strlen - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b15fa9224e6e1239414525d8d556d824701849fc
generic

ocfs2: mount fails with buffer overflow in strlen - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ac011cb3ff7a76b3e0e6e77158ee4ba2f929e1fb
generic

ocfs2: mount fails with buffer overflow in strlen - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/93be0eeea14cf39235e585c8f56df3b3859deaad
generic

ocfs2: mount fails with buffer overflow in strlen - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7623b1035ca2d17bde0f6a086ad6844a34648df1
generic

ocfs2: mount fails with buffer overflow in strlen - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4b74ddcc22ee6455946e80a9c4808801f8f8561e

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 124 total refreshes for this CVE.

  1. 2026-08-07 16:24 UTCEPSS rescore
  2. 2026-08-06 13:44 UTCEPSS rescore
  3. 2026-08-05 19:15 UTCEPSS rescore
  4. 2026-08-05 09:40 UTCEG score recompute
  5. 2026-08-05 09:40 UTCGHSA enrichment
  6. 2026-08-04 15:06 UTCEPSS rescore
  7. 2026-08-04 12:10 UTCEG score recompute
  8. 2026-08-04 12:10 UTCGHSA enrichment
  9. 2026-08-04 10:34 UTCEPSS rescore
  10. 2026-08-04 09:50 UTCEG score recompute
  11. 2026-08-04 09:50 UTCGHSA enrichment
  12. 2026-08-02 02:24 UTCEPSS rescore
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  23. 2026-07-23 02:06 UTCEG score recompute
  24. 2026-07-22 22:53 UTCEG score recompute
  25. 2026-07-22 14:06 UTCEPSS rescore
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  1. 2026-07-21 15:22 UTCEPSS rescore
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  14. 2026-07-13 22:27 UTCEPSS rescore
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  23. 2026-07-07 13:43 UTCEPSS rescore
  24. 2026-07-06 16:25 UTCEPSS rescore
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  41. 2026-06-26 10:07 UTCOSV refresh
  42. 2026-06-25 13:48 UTCEPSS rescore
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  49. 2026-06-21 14:55 UTCEPSS rescore
  50. 2026-06-21 01:58 UTCEPSS rescore
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  52. 2026-06-19 19:24 UTCEPSS rescore
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  68. 2026-06-08 16:41 UTCOSV refresh
  69. 2026-06-08 14:15 UTCEPSS rescore
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  74. 2026-06-06 13:46 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2021-47458?
CVE-2021-47458 is a high vulnerability published on May 22, 2024. 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 CONFIGFORTIFYSOURCE mouting an ocfs2 filesystem with either o2cb or pcmk cluster stack fails with the trace below. Problem seems to be that…
When was CVE-2021-47458 disclosed?
CVE-2021-47458 was first published in the National Vulnerability Database on May 22, 2024, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47458 actively exploited?
CVE-2021-47458 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 84.1% of all scored CVEs.
What is the CVSS score of CVE-2021-47458?
CVE-2021-47458 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-47458?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47458, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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