CVE-2026-31434

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-04-22. NVD baseline CVSS 5.5; sources differ by 0.0.

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

btrfs: fix leak of kobject name for sub-group space_info

When create_space_info_sub_group() allocates elements of space_info->sub_group[], kobject_init_and_add() is called for each element via btrfs_sysfs_add_space_info_type(). However, when check_removing_space_info() frees these elements, it does not call btrfs_sysfs_remove_space_info() on them. As a result, kobject_put() is not called and the associated kobj->name objects are leaked.

This memory leak is reproduced by running the blktests test case zbd/009 on kernels built with CONFIG_DEBUG_KMEMLEAK. The kmemleak feature reports the following error:

unreferenced object 0xffff888112877d40 (size 16): comm "mount", pid 1244, jiffies 4294996972 hex dump (first 16 bytes): 64 61 74 61 2d 72 65 6c 6f 63 00 c4 c6 a7 cb 7f data-reloc...... backtrace (crc 53ffde4d): __kmalloc_node_track_caller_noprof+0x619/0x870 kstrdup+0x42/0xc0 kobject_set_name_vargs+0x44/0x110 kobject_init_and_add+0xcf/0x150 btrfs_sysfs_add_space_info_type+0xfc/0x210 [btrfs] create_space_info_sub_group.constprop.0+0xfb/0x1b0 [btrfs] create_space_info+0x211/0x320 [btrfs] btrfs_init_space_info+0x15a/0x1b0 [btrfs] open_ctree+0x33c7/0x4a50 [btrfs] btrfs_get_tree.cold+0x9f/0x1ee [btrfs] vfs_get_tree+0x87/0x2f0 vfs_cmd_create+0xbd/0x280 __do_sys_fsconfig+0x3df/0x990 do_syscall_64+0x136/0x1540 entry_SYSCALL_64_after_hwframe+0x76/0x7e

To avoid the leak, call btrfs_sysfs_remove_space_info() instead of kfree() for the elements.

CVSS v3
5.5
EG Score
5.5(medium)
EPSS
2.4%
KEV
Not listed

Published

April 22, 2026

Last Modified

May 20, 2026

Advisory Details (6)

Auto-updated Jun 14, 2026
No patch confirmed yet.
generic

btrfs: fix leak of kobject name for sub-group space_info - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a4376d9a5d4c9610e69def3fc0b32c86a7ab7a41
generic

btrfs: fix leak of kobject name for sub-group space_info - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/94054ffd311a1f76b7093ba8ebf50bdb0d28337c
generic

btrfs: fix leak of kobject name for sub-group space_info - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/416484f21a9d1280cf6daa7ebc10c79b59c46e48
generic

btrfs: fix leak of kobject name for sub-group space_info - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3c844d01f9874a43004c82970d8da94f9aba8949
generic

btrfs: fix leak of kobject name for sub-group space_info - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3c645c6f7e5470debbb81666b230056de48f36dc
generic

btrfs: fix leak of kobject name for sub-group space_info - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1737ddeafbb1304f41ec2eede4f7366082e7c96a

Vendor Advisories for CVE-2026-31434(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 38× 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 110 total refreshes for this CVE.

  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
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  1. 2026-06-21 14:56 UTCEPSS rescore
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  10. 2026-06-14 23:18 UTCEPSS rescore
  11. 2026-06-14 16:55 UTCEG score recompute
  12. 2026-06-14 16:55 UTCGHSA enrichment
  13. 2026-06-13 23:00 UTCEPSS rescore
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  16. 2026-06-11 14:51 UTCEG score recompute
  17. 2026-06-11 14:51 UTCGHSA enrichment
  18. 2026-06-11 14:00 UTCEPSS rescore
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  20. 2026-06-10 08:17 UTCEG score recompute
  21. 2026-06-10 08:17 UTCGHSA enrichment
  22. 2026-06-09 09:49 UTCEG score recompute
  23. 2026-06-09 09:49 UTCGHSA enrichment
  24. 2026-06-08 14:17 UTCEPSS rescore
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  26. 2026-06-08 09:57 UTCEG score recompute
  27. 2026-06-08 09:57 UTCGHSA enrichment
  28. 2026-06-07 15:25 UTCEPSS rescore
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  31. 2026-06-07 11:29 UTCEG score recompute
  32. 2026-06-07 11:29 UTCGHSA enrichment
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  35. 2026-06-06 13:02 UTCEG score recompute
  36. 2026-06-06 13:02 UTCGHSA enrichment
  37. 2026-06-05 22:47 UTCEPSS rescore
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  39. 2026-06-05 12:36 UTCEG score recompute
  40. 2026-06-05 12:36 UTCGHSA enrichment
  41. 2026-06-05 06:10 UTCEPSS rescore
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  43. 2026-06-04 14:05 UTCEG score recompute
  44. 2026-06-04 14:05 UTCGHSA enrichment
  45. 2026-06-04 13:12 UTCEPSS rescore
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  47. 2026-06-03 12:43 UTCEG score recompute
  48. 2026-06-03 12:43 UTCGHSA enrichment
  49. 2026-06-02 20:13 UTCEPSS rescore
  50. 2026-06-02 20:13 UTCEPSS rescore
  51. 2026-06-02 13:47 UTCEG score recompute
  52. 2026-06-02 13:47 UTCGHSA enrichment
  53. 2026-06-01 15:14 UTCEG score recompute
  54. 2026-06-01 15:14 UTCGHSA enrichment
  55. 2026-06-01 13:51 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-31434?
CVE-2026-31434 is a medium vulnerability published on April 22, 2026. In the Linux kernel, the following vulnerability has been resolved: btrfs: fix leak of kobject name for sub-group space_info When createspaceinfosubgroup() allocates elements of spaceinfo->subgroup[], kobjectinitand_add() is called for each element via btrfssysfsaddspaceinfo_type(). However, when…
When was CVE-2026-31434 disclosed?
CVE-2026-31434 was first published in the National Vulnerability Database on April 22, 2026, with the most recent update on May 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31434 actively exploited?
CVE-2026-31434 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-31434?
CVE-2026-31434 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-31434?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31434, 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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