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NVD / CVE Program· CNA Linux

CVE-2026-43359: btrfs: fix transaction abort on set received ioctl due to item overflow

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.16% (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 2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5, 41fb97353ff58fa4f31904c343fc8e3df2f7517d, 87f2c46003fce4d739138aab4af1942b1afdadac.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5, 41fb97353ff58fa4f31904c343fc8e3df2f7517d, 87f2c46003fce4d739138aab4af1942b1afdadac 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 transaction abort on set received ioctl due to item overflow If the set received ioctl fails due to an item overflow when attempting to add the BTRFS_UUID_KEY_RECEIVED_SUBVOL we have to abort the transaction since we did some metadata updates before. This means that if a user calls this ioctl with the same received UUID field for a lot of subvolumes, we will hit the overflow, trigger the transaction abort and turn the filesystem into RO mode. A malicious user could exploit this, and this ioctl does not even requires that a user has admin privileges (CAP_SYS_ADMIN), only that he/she owns the subvolume. Fix this by doing an early check for item overflow before starting a transaction. This is also race safe because we are holding the subvol_sem semaphore in exclusive (write) mode. A test case for fstests will follow soon.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 8, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 5th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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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?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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 kernel3.12 and later · before 6.1.167
  • linux linux kernel6.2 and later · before 6.6.130
  • linux linux kernel6.7 and later · before 6.12.78
  • linux linux kernel6.13 and later · before 6.18.19
  • linux linux kernel6.19 and later · before 6.19.9
  • linux linux kernel7.0

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

    • 3.12affected
    • dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 and later · before b9914db13ac15aca3b74544c0bb1a2e0dad1f174affected · git
    • dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 and later · before b19c0465e4daad5aa8f60552ea0578cf31a11b1eaffected · git
    • dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 and later · before 2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5affected · git
    • dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 and later · before d11aefe654a04fc41996d254748d6a38b6b0a7beaffected · git
    • dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 and later · before 41fb97353ff58fa4f31904c343fc8e3df2f7517daffected · git
    • dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 and later · before 87f2c46003fce4d739138aab4af1942b1afdadacaffected · git
    • before 3.12not affected · semver
    • 6.1.167 and later · up to and including 6.1.*not affected · semver
    • 6.6.130 and later · up to and including 6.6.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.10-16.19.10-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • 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
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-43357May 8, 2026 · iio: gyro: mpu3050-core: fix pm_runtime error handling
    22Monitor
  • ← EarlierCVE-2026-43358May 8, 2026 · btrfs: add missing RCU unlock in error path in try_release_subpage_extent_buffer()
    22Monitor
  • Later →CVE-2026-43360May 8, 2026 · btrfs: fix transaction abort on file creation due to name hash collision
    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 Linux2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5Vendor (CNA)
Linux Linux41fb97353ff58fa4f31904c343fc8e3df2f7517dVendor (CNA)
Linux Linux87f2c46003fce4d739138aab4af1942b1afdadacVendor (CNA)
Linux Linuxb19c0465e4daad5aa8f60552ea0578cf31a11b1eVendor (CNA)
Linux Linuxb9914db13ac15aca3b74544c0bb1a2e0dad1f174Vendor (CNA)
Linux Linuxd11aefe654a04fc41996d254748d6a38b6b0a7beVendor (CNA)
debian:linux6.1.170-1 · 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-2026-5317648 days apartIB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
    39Monitor
  • CVE-2026-431872 days apartxfs: delete attr leaf freemap entries when empty
    35Monitor
  • CVE-2026-5317848 days apartstaging: rtl8723bs: rtw_mlme: add bounds checks before ie_length subtraction
    32Monitor
  • CVE-2026-3165614 days apartdrm/i915/gt: fix refcount underflow in intel_engine_park_heartbeat
    31Monitor
  • CVE-2026-4610720 days apartdm-thin: fix metadata refcount underflow
    31Monitor
  • CVE-2026-5313047 days apartfs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START
    31Monitor

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
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-191 · Integer Underflow (Wrap or Wraparound)

CVSS vector

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

nvd-primary

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