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NVD / CVE Program· CNA Linux

CVE-2026-43238: net/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash()

MediumCVSS 5.5 · v3.1—No exploit Fix available

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: 0.12% (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 015cebdfcb97b5347fb7f598ea712a281cb35840, 3c2b95b26860bd6f8e2310d31ea1200d3f8f173e, 4ece5eb4836f8ff03b9004dc2430a7169f282851.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 015cebdfcb97b5347fb7f598ea712a281cb35840, 3c2b95b26860bd6f8e2310d31ea1200d3f8f173e, 4ece5eb4836f8ff03b9004dc2430a7169f282851 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: net/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash() Commit 38a6f0865796 ("net: sched: support hash selecting tx queue") added SKBEDIT_F_TXQ_SKBHASH support. The inclusive range size is computed as: mapping_mod = queue_mapping_max - queue_mapping + 1; The range size can be 65536 when the requested range covers all possible u16 queue IDs (e.g. queue_mapping=0 and queue_mapping_max=U16_MAX). That value cannot be represented in a u16 and previously wrapped to 0, so tcf_skbedit_hash() could trigger a divide-by-zero: queue_mapping += skb_get_hash(skb) % params->mapping_mod; Compute mapping_mod in a wider type and reject ranges larger than U16_MAX to prevent params->mapping_mod from becoming 0 and avoid the crash.

Published
May 6, 2026
Updated
Nov 11, 2026
EPSS
0.1% · 2th 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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-43238

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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

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
    • 38a6f0865796e26fc38fff4858f681d9ae76fa0f and later · before 59809fda4da7730cfe84a948033f47eb45db073daffected · git
    • 38a6f0865796e26fc38fff4858f681d9ae76fa0f and later · before 9c735a7d98c982a786b0db71eb6566ee00aaa04faffected · git
    • 38a6f0865796e26fc38fff4858f681d9ae76fa0f and later · before 015cebdfcb97b5347fb7f598ea712a281cb35840affected · git
    • 38a6f0865796e26fc38fff4858f681d9ae76fa0f and later · before 4ece5eb4836f8ff03b9004dc2430a7169f282851affected · git
    • 38a6f0865796e26fc38fff4858f681d9ae76fa0f and later · before 3c2b95b26860bd6f8e2310d31ea1200d3f8f173eaffected · git
    • 38a6f0865796e26fc38fff4858f681d9ae76fa0f and later · before be054cc66f739a9ba615dba9012a07fab8e7dd6faffected · git
    • before 5.19not affected · semver
    • 6.1.165 and later · up to and including 6.1.*not affected · semver
    • 6.6.128 and later · up to and including 6.6.*not affected · semver
Affected versions · NVD (5)

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 6.1.165
  • linux linux kernel6.2 and later · before 6.6.128
  • linux linux kernel6.7 and later · before 6.12.75
  • linux linux kernel6.13 and later · before 6.18.16
  • linux linux kernel6.19 and later · before 6.19.6

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 6.19.6-16.19.6-1

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-2026-43236May 6, 2026 · drm/atmel-hlcdc: fix use-after-free of drm_crtc_commit after release
    31Monitor
  • ← EarlierCVE-2026-43237May 6, 2026 · drm/amdgpu: Refactor amdgpu_gem_va_ioctl for Handling Last Fence Update and Timeline Management v4
    31Monitor
  • Later →CVE-2026-43239May 6, 2026 · smb: client: prevent races in ->query_interfaces()
    35Monitor

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 Linux015cebdfcb97b5347fb7f598ea712a281cb35840Vendor (CNA)
Linux Linux3c2b95b26860bd6f8e2310d31ea1200d3f8f173eVendor (CNA)
Linux Linux4ece5eb4836f8ff03b9004dc2430a7169f282851Vendor (CNA)
Linux Linux59809fda4da7730cfe84a948033f47eb45db073dVendor (CNA)
Linux Linux9c735a7d98c982a786b0db71eb6566ee00aaa04fVendor (CNA)
Linux Linuxbe054cc66f739a9ba615dba9012a07fab8e7dd6fVendor (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.

Variant candidates

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

  • CVE-2026-431820 days apartmedia: ccs: Avoid possible division by zero
    22Monitor
  • CVE-2026-432670 days apartwifi: rtw89: fix potential zero beacon interval in beacon tracking
    22Monitor
  • CVE-2026-433542 days apartiio: proximity: hx9023s: Protect against division by zero in set_samp_freq
    22Monitor
  • CVE-2026-434112 days aparttipc: fix divide-by-zero in tipc_sk_filter_connect()
    22Monitor
  • CVE-2026-317675 days apartdrm/i915/dsi: Don't do DSC horizontal timing adjustments in command mode
    22Monitor
  • CVE-2026-317705 days aparthwmon: (occ) Fix division by zero in occ_show_power_1()
    22Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

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-369 · Divide By Zero

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.

References

Show all references (5 more)

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

All records