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NVD / CVE Program· CNA Linux

CVE-2026-46129: btrfs: fix double free in create_space_info() error path

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.13% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 3f487be81292702a59ea9dbc4088b3360a50e837, 6.1.175, 6.12.88; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3f487be81292702a59ea9dbc4088b3360a50e837, 6.1.175, 6.12.88; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix double free in create_space_info() error path When kobject_init_and_add() fails, the call chain is: create_space_info() -> btrfs_sysfs_add_space_info_type() -> kobject_init_and_add() -> failure -> kobject_put(&space_info->kobj) -> space_info_release() -> kfree(space_info) Then control returns to create_space_info(): btrfs_sysfs_add_space_info_type() returns error -> goto out_free -> kfree(space_info) This causes a double free. Keep the direct kfree(space_info) for the earlier failure path, but after btrfs_sysfs_add_space_info_type() has called kobject_put(), let the kobject release callback handle the cleanup.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 28, 2026
Updated
Aug 5, 2026
EPSS
0.1% · 3th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
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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  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

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 6.1.175
  • linux linux kernel6.6.122 and later · before 6.6.140
  • linux linux kernel6.12.67 and later · before 6.12.88
  • linux linux kernel6.18.7 and later · before 6.18.30
  • linux linux kernel6.19.1 and later · before 7.0.7
  • linux linux kernel6.19

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

    • 6.19affected
    • 20e8f2de3688082eeafeb93c8900485b7542457e and later · before ae6d6e31ceb72b7697c28a528e4923c08e3c2ef5affected · git
    • 58208907c4044a764dbd8896026283905da6d9be and later · before c2670ec4aa49ca226bce9776601e0da37502be07affected · git
    • bb4fa4c0b54aae25e55faeda7f78d0c11b8cd618 and later · before f414b3abbba59ef379a2b3c31f2bdd9358ed5e53affected · git
    • 6cb008f1bb23e023dfe615cca5df14570dfc8da5 and later · before 9a060970fd7b5e1c561e4ce73cb9949e4269a738affected · git
    • a11224a016d6d1d46a4d9b6573244448a80d4d7f and later · before dd6ade0fdd59218d71a981ae7c937a304e49209caffected · git
    • a11224a016d6d1d46a4d9b6573244448a80d4d7f and later · before 3f487be81292702a59ea9dbc4088b3360a50e837affected · git
    • 6.1.162 and later · before 6.1.175affected · semver
    • 6.6.122 and later · before 6.6.140affected · semver
    • 6.12.67 and later · before 6.12.88affected · 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 6.12.88-16.12.88-1
Debian:14linuxbefore 7.0.7-17.0.7-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-46126May 28, 2026 · RDMA/mana: Fix mana_destroy_wq_obj() cleanup in mana_ib_create_qp_rss()
    22Monitor
  • ← EarlierCVE-2026-46127May 28, 2026 · RDMA/ocrdma: Don't NULL deref uctx on errors in ocrdma_copy_pd_uresp()
    22Monitor
  • Later →CVE-2026-46131May 28, 2026 · KVM: x86: check for nEPT/nNPT in slow flush hypercalls
    22Monitor

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 Linux3f487be81292702a59ea9dbc4088b3360a50e837Vendor (CNA)
Linux Linux6.1.175Vendor (CNA)
Linux Linux6.12.88Vendor (CNA)
Linux Linux6.18.30Vendor (CNA)
Linux Linux6.6.140Vendor (CNA)
Linux Linux9a060970fd7b5e1c561e4ce73cb9949e4269a738Vendor (CNA)
Linux Linuxae6d6e31ceb72b7697c28a528e4923c08e3c2ef5Vendor (CNA)
Linux Linuxc2670ec4aa49ca226bce9776601e0da37502be07Vendor (CNA)
Linux Linuxdd6ade0fdd59218d71a981ae7c937a304e49209cVendor (CNA)
Linux Linuxf414b3abbba59ef379a2b3c31f2bdd9358ed5e53Vendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.06.6.141.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
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-2026-6438758 days apartsmb: client: fix query directory 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

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
Low
Privileges required
Low
User interaction
None
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:L/PR:L/UI:N/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

Show all references (5 more)

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

All records