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NVD / CVE Program· CNA Linux

CVE-2026-43366: io_uring/kbuf: check if target buffer list is still legacy on recycle

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: 0.12% (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 439a6728ec4641ffad1ca796622c19bc525e570f, 50ad880db3013c6fee0ef13781762a39e2e7ef83, 97b57f69fee1b61b41acbf37e7720cac9d389fa4.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 439a6728ec4641ffad1ca796622c19bc525e570f, 50ad880db3013c6fee0ef13781762a39e2e7ef83, 97b57f69fee1b61b41acbf37e7720cac9d389fa4 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: io_uring/kbuf: check if target buffer list is still legacy on recycle There's a gap between when the buffer was grabbed and when it potentially gets recycled, where if the list is empty, someone could've upgraded it to a ring provided type. This can happen if the request is forced via io-wq. The legacy recycling is missing checking if the buffer_list still exists, and if it's of the correct type. Add those checks.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 8, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 2th 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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

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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  • 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 exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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 kernel5.19 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

    • 5.19affected
    • c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and later · before a7b33671e418fca507feebd1d56e7f4952a4b25caffected · git
    • c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and later · before 439a6728ec4641ffad1ca796622c19bc525e570faffected · git
    • c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and later · before f3fb54e7a8b4aadcc2836ee463eec8c88709b8aaaffected · git
    • c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and later · before 50ad880db3013c6fee0ef13781762a39e2e7ef83affected · git
    • c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and later · before 97b57f69fee1b61b41acbf37e7720cac9d389fa4affected · git
    • c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and later · before c2c185be5c85d37215397c8e8781abf0a69bec1faffected · git
    • before 5.19not 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
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-64kbbefore 5.14.21-150500.55.172.25.14.21-150500.55.172.2
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-docsbefore 5.14.21-150500.55.172.15.14.21-150500.55.172.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-obs-buildbefore 5.14.21-150500.55.172.25.14.21-150500.55.172.2
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-symsbefore 5.14.21-150500.55.172.15.14.21-150500.55.172.1
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_27before 21-150500.2.221-150500.2.2
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_28before 20-150500.2.220-150500.2.2
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_30before 15-150500.2.215-150500.2.2
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_31before 13-150500.2.213-150500.2.2
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_37before 6-150500.2.26-150500.2.2
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_39before 4-150500.2.24-150500.2.2
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_40before 2-150500.2.22-150500.2.2
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_41before 2-150500.2.22-150500.2.2
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_42before 1-150500.11.3.21-150500.11.3.2
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_12before 20-150600.2.220-150600.2.2
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_13before 18-150600.2.218-150600.2.2
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_22before 6-150600.2.26-150600.2.2
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_23before 5-150600.2.25-150600.2.2
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_25before 3-150600.2.23-150600.2.2
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7_Update_1before 19-150700.2.219-150700.2.2
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7_Update_10before 6-150700.2.26-150700.2.2
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7_Update_11before 6-150700.2.26-150700.2.2

+64

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-2026-43362May 8, 2026 · smb: client: fix in-place encryption corruption in SMB2_write()
    32Monitor
  • ← EarlierCVE-2026-43365May 8, 2026 · xfs: fix undersized l_iclog_roundoff values
    32Monitor
  • Later →CVE-2026-43368May 8, 2026 · drm/i915: Fix potential overflow of shmem scatterlist length
    31Monitor

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 Linux439a6728ec4641ffad1ca796622c19bc525e570fVendor (CNA)
Linux Linux50ad880db3013c6fee0ef13781762a39e2e7ef83Vendor (CNA)
Linux Linux97b57f69fee1b61b41acbf37e7720cac9d389fa4Vendor (CNA)
Linux Linuxa7b33671e418fca507feebd1d56e7f4952a4b25cVendor (CNA)
Linux Linuxc2c185be5c85d37215397c8e8781abf0a69bec1fVendor (CNA)
Linux Linuxf3fb54e7a8b4aadcc2836ee463eec8c88709b8aaVendor (CNA)
debian:linux6.1.170-1 · Debian:12Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_1014-1.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_1113-1.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_1213-1.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_1311-1.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_149-1.2 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_168-1.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_177-1.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_186-1.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_213-1.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_820-1.2 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_920-1.2 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-livepatch-SLE16-RT_Update_94-160000.1.1 · SUSE:Linux Micro 6.2Package 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.

No nightly-computed relations.

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-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. 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