CVE-2026-43288

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-05-08. 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: 0.2%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

ext4: move ext4_percpu_param_init() before ext4_mb_init()

When running kvm-xfstests -c ext4/1k -C 1 generic/383 with the DOUBLE_CHECK macro defined, the following panic is triggered:

================================================================== EXT4-fs error (device vdc): ext4_validate_block_bitmap:423: comm mount: bg 0: bad block bitmap checksum BUG: unable to handle page fault for address: ff110000fa2cc000 PGD 3e01067 P4D 3e02067 PUD 0 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 0 UID: 0 PID: 2386 Comm: mount Tainted: G W 6.18.0-gba65a4e7120a-dirty #1152 PREEMPT(none) RIP: 0010:percpu_counter_add_batch+0x13/0xa0 Call Trace: ext4_mark_group_bitmap_corrupted+0xcb/0xe0 ext4_validate_block_bitmap+0x2a1/0x2f0 ext4_read_block_bitmap+0x33/0x50 mb_group_bb_bitmap_alloc+0x33/0x80 ext4_mb_add_groupinfo+0x190/0x250 ext4_mb_init_backend+0x87/0x290 ext4_mb_init+0x456/0x640 __ext4_fill_super+0x1072/0x1680 ext4_fill_super+0xd3/0x280 get_tree_bdev_flags+0x132/0x1d0 vfs_get_tree+0x29/0xd0 vfs_cmd_create+0x59/0xe0 __do_sys_fsconfig+0x4f6/0x6b0 do_syscall_64+0x50/0x1f0 entry_SYSCALL_64_after_hwframe+0x76/0x7e ==================================================================

This issue can be reproduced using the following commands: mkfs.ext4 -F -q -b 1024 /dev/sda 5G tune2fs -O quota,project /dev/sda mount /dev/sda /tmp/test

With DOUBLE_CHECK defined, mb_group_bb_bitmap_alloc() reads and validates the block bitmap. When the validation fails, ext4_mark_group_bitmap_corrupted() attempts to update sbi->s_freeclusters_counter. However, this percpu_counter has not been initialized yet at this point, which leads to the panic described above.

Fix this by moving the execution of ext4_percpu_param_init() to occur before ext4_mb_init(), ensuring the per-CPU counters are initialized before they are used.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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%
Automatability30% × 15%
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

Published

May 8, 2026

Last Modified

September 14, 2026

Advisory Details (5)

Auto-updated Jun 15, 2026
Patch available.
generic

ext4: move ext4_percpu_param_init() before ext4_mb_init() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bf5b609524497c195f801cd5707252384aed8149
generic

ext4: move ext4_percpu_param_init() before ext4_mb_init() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/aec095f3cc6cf209effd93278ce35be27db81d73
generic

ext4: move ext4_percpu_param_init() before ext4_mb_init() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9e9fb259bcddf459a0168f4a964e979e500a68a5
generic

ext4: move ext4_percpu_param_init() before ext4_mb_init() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/270564513489d98b721a1e4a10017978d5213bff
generic

ext4: move ext4_percpu_param_init() before ext4_mb_init() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0d5fcb063cdabb9aeaa8554b7fedad2092c4150e

Vendor Advisories for CVE-2026-43288(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(14)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-oracle-edge (6.8.0-1057.58~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-virtual-6.8 (6.8.0-134.134) @ noble2026-09-14ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-09-14ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-09-14ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-09-14ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-09-14ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-14ubuntu
linuxKernel @ 6.1.188 (fixes >=3.17.0)—osv
linuxKernel @ 6.6.128 (fixes >=3.17.0)—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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.103-1 ... 7.2~rc5-1~exp1 (496 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (358 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)
  • every version up to 6.12.85-1: fixed in 6.12.85-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (117 versions)
  • every version up to 6.19.6-1: fixed in 6.19.6-1
—

Weakness Classification(1)

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

All Vendor Advisories

(12)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 28× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 212 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 112 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  2. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  3. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  4. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  5. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  6. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  7. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  8. 2026-10-03 22:28 UTCOSV refresh
  9. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  10. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  11. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  12. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  13. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  14. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  20. 2026-09-14 12:35 UTCVendor advisory
  21. 2026-09-14 12:35 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  22. 2026-09-14 12:01 UTCEG score recompute
  23. 2026-09-14 12:01 UTCVendor advisory
  24. 2026-09-14 12:01 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  25. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
Show 75 more
  1. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  2. 2026-09-11 14:53 UTCOSV refresh
  3. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  4. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  5. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  6. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  7. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  8. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  9. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  10. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  11. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  12. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  13. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  14. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  15. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-08-23 19:19 UTCEG score recompute
  18. 2026-08-23 19:19 UTCVendor advisory
  19. 2026-08-23 19:19 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  20. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  23. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  24. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  25. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  26. 2026-08-17 11:57 UTCEG score recompute
  27. 2026-08-17 11:57 UTCVendor advisory
  28. 2026-08-17 11:57 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  29. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  30. 2026-08-16 04:38 UTCEG score recompute
  31. 2026-08-16 04:38 UTCVendor advisory
  32. 2026-08-16 04:38 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  33. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  34. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  35. 2026-08-14 03:14 UTCEG score recompute
  36. 2026-08-14 03:14 UTCVendor advisory
  37. 2026-08-14 03:14 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  38. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  39. 2026-08-13 00:04 UTCEG score recompute
  40. 2026-08-13 00:04 UTCVendor advisory
  41. 2026-08-13 00:04 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  42. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  43. 2026-08-12 00:42 UTCEG score recompute
  44. 2026-08-12 00:42 UTCVendor advisory
  45. 2026-08-12 00:42 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  46. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  47. 2026-08-11 01:20 UTCEG score recompute
  48. 2026-08-11 01:20 UTCVendor advisory
  49. 2026-08-11 01:20 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  50. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  51. 2026-08-10 01:49 UTCEG score recompute
  52. 2026-08-10 01:49 UTCVendor advisory
  53. 2026-08-10 01:49 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  54. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  55. 2026-08-09 02:26 UTCEG score recompute
  56. 2026-08-09 02:26 UTCVendor advisory
  57. 2026-08-09 02:26 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  58. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  59. 2026-08-07 20:55 UTCEG score recompute
  60. 2026-08-07 20:55 UTCVendor advisory
  61. 2026-08-07 20:55 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  62. 2026-08-06 21:33 UTCEG score recompute
  63. 2026-08-06 21:33 UTCVendor advisory
  64. 2026-08-06 21:33 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  65. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  66. 2026-08-05 22:10 UTCEG score recompute
  67. 2026-08-05 22:10 UTCVendor advisory
  68. 2026-08-05 22:10 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  69. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  70. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  71. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  72. 2026-08-04 01:57 UTCEG score recompute
  73. 2026-08-04 01:57 UTCVendor advisory
  74. 2026-08-04 01:57 UTCGHSA enrichmentGHSA-h57h-m4cv-vwxg · GitHub CVSS 5.5
  75. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.1% · 2nd percentile

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-43288?
CVE-2026-43288 is a medium vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: ext4: move ext4percpuparaminit() before ext4mb_init() When running kvm-xfstests -c ext4/1k -C 1 generic/383 with the DOUBLE_CHECK macro defined, the following panic is triggered:…
When was the CVE record for CVE-2026-43288 published?
The CVE record for CVE-2026-43288 was published on May 8, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 14, 2026; the record at its source may have been updated since.
Is CVE-2026-43288 actively exploited?
CVE-2026-43288 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-43288?
CVE-2026-43288 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-43288?
A fix for CVE-2026-43288 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-43288 are linked in the Vendor Advisories panel on this page.

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