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CVE-2026-46164· NVD / CVE Program· CNA Linux

btrfs: fix double free in create_space_info_sub_group() error path

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix double free in create_space_info_sub_group() error path When kobject_init_and_add() fails, the call chain is: create_space_info_sub_group() -> btrfs_sysfs_add_space_info_type() -> kobject_init_and_add() -> failure -> kobject_put(&sub_group->kobj) -> space_info_release() -> kfree(sub_group) Then control returns to create_space_info_sub_group(), where: btrfs_sysfs_add_space_info_type() returns error -> kfree(sub_group) Thus, sub_group is freed twice. Keep parent->sub_group[index] = NULL for the failure path, but after btrfs_sysfs_add_space_info_type() has called kobject_put(), let the kobject release callback handle the cleanup.

HighCVSS 7.0 · v3.1—No exploit Fix available
Published
May 28, 2026
Updated
Aug 5, 2026
EPSS
0.2% · 5th percentile
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Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CNA vs NVD score

NVD
—
CNA · Linux
7.0
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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Affected systems

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.1.162 and later · before 6.2
  • linux linux kernel6.6.122 and later · before 6.6.141
  • linux linux kernel6.12.67 and later · before 6.12.90
  • linux linux kernel6.16 and later · before 6.18.32
  • linux linux kernel6.19 and later · before 7.0.7

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6.16affected
    • 64c7ddda83acfbaa0efb381a1928ce908c584607 and later · before c2d59527cba6d59f0d77a75c1101ab4e69758beaaffected · git
    • 0bd151ce4200ca847990e05cca29a76456982ca5 and later · before d2a675f2e238ec96c8e91e2718c1f910c9c8fb21affected · git
    • 190d5a7c4fe42b8c9aa46e3336389e7cb10395bb and later · before 14b22be1dd844383eb03af9b1ee3b6b25d32aeafaffected · git
    • f92ee31e031c7819126d2febdda0c3e91f5d2eb9 and later · before dfd05a16b5c9d1d98b47905f37f2fccda52173d1affected · git
    • f92ee31e031c7819126d2febdda0c3e91f5d2eb9 and later · before 259af6857a1b4f1e9ef8b780353f9d11c26a22bdaffected · git
    • f92ee31e031c7819126d2febdda0c3e91f5d2eb9 and later · before a7449edf96143f192606ec8647e3167e1ecbd728affected · git
    • 6.1.162 and later · before 6.1.176affected · semver
    • 6.6.122 and later · before 6.6.141affected · semver
    • 6.12.67 and later · before 6.12.90affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.90-16.12.90-1
Debian:14linuxbefore 7.0.7-17.0.7-1

Same product

linux: all records

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux14b22be1dd844383eb03af9b1ee3b6b25d32aeafVendor (CNA)
Linux Linux259af6857a1b4f1e9ef8b780353f9d11c26a22bdVendor (CNA)
Linux Linux6.1.176Vendor (CNA)
Linux Linux6.12.90Vendor (CNA)
Linux Linux6.6.141Vendor (CNA)
Linux Linuxa7449edf96143f192606ec8647e3167e1ecbd728Vendor (CNA)
Linux Linuxc2d59527cba6d59f0d77a75c1101ab4e69758beaVendor (CNA)
Linux Linuxd2a675f2e238ec96c8e91e2718c1f910c9c8fb21Vendor (CNA)
Linux Linuxdfd05a16b5c9d1d98b47905f37f2fccda52173d1Vendor (CNA)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-4341420 days apartscsi: qla2xxx: Completely fix fcport double free
    39Monitor
  • CVE-2026-4301127 days apartnet/x25: Fix potential double free of skb
    39Monitor
  • CVE-2026-5299327 days aparttipc: fix double-free in tipc_buf_append()
    39Monitor
  • CVE-2026-3160834 days apartsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()
    39Monitor
  • CVE-2026-3160934 days apartsmb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
    39Monitor
  • CVE-2026-6438658 days apartsmb: client: fix query_info() replay double-free
    39Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-415 · Double Free

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records