CVE-2022-48631

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2024-04-28. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: 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:

ext4: fix bug in extents parsing when eh_entries == 0 and eh_depth > 0

When walking through an inode extents, the ext4_ext_binsearch_idx() function assumes that the extent header has been previously validated. However, there are no checks that verify that the number of entries (eh->eh_entries) is non-zero when depth is > 0. And this will lead to problems because the EXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this:

[ 135.245946] ------------[ cut here ]------------ [ 135.247579] kernel BUG at fs/ext4/extents.c:2258! [ 135.249045] invalid opcode: 0000 [#1] PREEMPT SMP [ 135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4 [ 135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014 [ 135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0 [ 135.256475] Code: [ 135.261433] RSP: 0018:ffffc900005939f8 EFLAGS: 00010246 [ 135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023 [ 135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c [ 135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c [ 135.268576] R10: 0000000000002602 R11: 0000000000000000 R12: 0000000000000024 [ 135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000 [ 135.272394] FS: 00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000 [ 135.274510] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0 [ 135.277952] Call Trace: [ 135.278635] [ 135.279247] ? preempt_count_add+0x6d/0xa0 [ 135.280358] ? percpu_counter_add_batch+0x55/0xb0 [ 135.281612] ? _raw_read_unlock+0x18/0x30 [ 135.282704] ext4_map_blocks+0x294/0x5a0 [ 135.283745] ? xa_load+0x6f/0xa0 [ 135.284562] ext4_mpage_readpages+0x3d6/0x770 [ 135.285646] read_pages+0x67/0x1d0 [ 135.286492] ? folio_add_lru+0x51/0x80 [ 135.287441] page_cache_ra_unbounded+0x124/0x170 [ 135.288510] filemap_get_pages+0x23d/0x5a0 [ 135.289457] ? path_openat+0xa72/0xdd0 [ 135.290332] filemap_read+0xbf/0x300 [ 135.291158] ? _raw_spin_lock_irqsave+0x17/0x40 [ 135.292192] new_sync_read+0x103/0x170 [ 135.293014] vfs_read+0x15d/0x180 [ 135.293745] ksys_read+0xa1/0xe0 [ 135.294461] do_syscall_64+0x3c/0x80 [ 135.295284] entry_SYSCALL_64_after_hwframe+0x46/0xb0

This patch simply adds an extra check in __ext4_ext_check(), verifying that eh_entries is not 0 when eh_depth is > 0.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

April 28, 2024

Last Modified

September 19, 2025

References (10)

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 5.4.215—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Data Freshness Timeline

(refreshed 7× in last 7d / 46× 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 123 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
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  8. 2026-08-01 05:36 UTCOSV refresh
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  20. 2026-07-23 02:16 UTCEG score recompute
  21. 2026-07-22 23:03 UTCEG score recompute
  22. 2026-07-22 14:06 UTCEPSS rescore
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  24. 2026-07-21 15:23 UTCEPSS rescore
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  1. 2026-07-20 17:05 UTCEPSS rescore
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  11. 2026-07-15 01:58 UTCEPSS rescore
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  13. 2026-07-14 12:40 UTCOSV refresh
  14. 2026-07-13 22:28 UTCEPSS rescore
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  18. 2026-07-12 05:44 UTCEPSS rescore
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  21. 2026-07-09 19:08 UTCEPSS rescore
  22. 2026-07-08 15:13 UTCEPSS rescore
  23. 2026-07-07 13:44 UTCEPSS rescore
  24. 2026-07-06 16:25 UTCEPSS rescore
  25. 2026-07-06 02:21 UTCEPSS rescore
  26. 2026-07-05 02:28 UTCEPSS rescore
  27. 2026-07-04 06:29 UTCEPSS rescore
  28. 2026-07-01 15:04 UTCEPSS rescore
  29. 2026-06-30 23:21 UTCEPSS rescore
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  31. 2026-06-29 14:04 UTCEPSS rescore
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  35. 2026-06-27 03:07 UTCEPSS rescore
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  37. 2026-06-26 13:37 UTCOSV refresh
  38. 2026-06-25 13:48 UTCEPSS rescore
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  40. 2026-06-24 14:03 UTCEPSS rescore
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  42. 2026-06-23 21:31 UTCEPSS rescore
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  44. 2026-06-22 14:24 UTCEPSS rescore
  45. 2026-06-21 14:55 UTCEPSS rescore
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  47. 2026-06-21 01:58 UTCEPSS rescore
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  49. 2026-06-19 19:24 UTCEPSS rescore
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  51. 2026-06-18 17:51 UTCEPSS rescore
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  66. 2026-06-08 20:11 UTCOSV refresh
  67. 2026-06-08 14:15 UTCEPSS rescore
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  69. 2026-06-07 15:23 UTCEPSS rescore
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  71. 2026-06-06 13:46 UTCEPSS rescore
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  73. 2026-06-05 22:46 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2022-48631?
CVE-2022-48631 is a medium vulnerability published on April 28, 2024. In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug in extents parsing when ehentries == 0 and ehdepth > 0 When walking through an inode extents, the ext4extbinsearch_idx() function assumes that the extent header has been previously validated. However, there are no…
When was CVE-2022-48631 disclosed?
CVE-2022-48631 was first published in the National Vulnerability Database on April 28, 2024, with the most recent update on September 19, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-48631 actively exploited?
CVE-2022-48631 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 85.5% of all scored CVEs.
What is the CVSS score of CVE-2022-48631?
CVE-2022-48631 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2022-48631?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-48631, 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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