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
5.5EG
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:

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)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
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.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.1.168—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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 43× 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 125 total refreshes for this CVE.

  1. 2026-07-26 14:54 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-25 14:18 UTCEPSS rescore
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  8. 2026-07-23 03:08 UTCEG score recompute
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  15. 2026-07-20 04:10 UTCOSV refresh
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  1. 2026-07-15 02:00 UTCEPSS rescore
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  27. 2026-06-21 14:56 UTCEPSS rescore
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  38. 2026-06-14 16:55 UTCGHSA enrichment
  39. 2026-06-13 23:00 UTCEPSS rescore
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  42. 2026-06-11 14:51 UTCGHSA enrichment
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  45. 2026-06-10 08:17 UTCGHSA enrichment
  46. 2026-06-09 09:49 UTCGHSA enrichment
  47. 2026-06-08 14:17 UTCEPSS rescore
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  49. 2026-06-08 09:57 UTCGHSA enrichment
  50. 2026-06-07 15:25 UTCEPSS rescore
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  53. 2026-06-07 11:29 UTCGHSA enrichment
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  56. 2026-06-06 13:02 UTCGHSA enrichment
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  68. 2026-06-02 13:47 UTCGHSA enrichment
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  70. 2026-06-01 13:51 UTCEPSS rescore
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  74. 2026-05-31 00:16 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 0% probability of exploitation in the next 30 days, which ranks it in the top 97.6% of all scored CVEs.
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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