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NVD / CVE Program· CNA Linux

CVE-2026-52916: batman-adv: frag: disallow unicast fragment in fragment

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 0c208fa3859e3a33a1c38bebc41d021166e94ac8, 5418be6c2e117bf8a316582795a8e3ff90f45e5d, 5895ad21c7059a652da83fb817510f7a1e962abf; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0c208fa3859e3a33a1c38bebc41d021166e94ac8, 5418be6c2e117bf8a316582795a8e3ff90f45e5d, 5895ad21c7059a652da83fb817510f7a1e962abf; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1 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: batman-adv: frag: disallow unicast fragment in fragment batadv_frag_skb_buffer() is called by batadv_batman_skb_recv() when a BATADV_UNICAST_FRAG packet is received. Once all fragments are collected and the packet is reassembled, batadv_recv_frag_packet() calls batadv_batman_skb_recv() again to process the defragmented payload. A malicious sender can craft a BATADV_UNICAST_FRAG packet whose reassembled payload is itself a BATADV_UNICAST_FRAG packet (matryoshka-style nesting). Each nesting level recurses through batadv_batman_skb_recv() without bound, growing the kernel stack until it is exhausted. Since refragmentation or fragments in fragments are not actually allowed, discard all packets which are still BATADV_UNICAST_FRAG packets after the defragmentation process.

Published
Jun 24, 2026
Updated
Jul 8, 2026
EPSS
0.1% · 2th percentile
CWE
—

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

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

Follow CVE-2026-52916

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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

    • 3.13affected
    • 610bfc6bc99bc83680d190ebc69359a05fc7f605 and later · before 0c208fa3859e3a33a1c38bebc41d021166e94ac8affected · git
    • 610bfc6bc99bc83680d190ebc69359a05fc7f605 and later · before bcda4814dc6524283c0b958882cb963d75fe411daffected · git
    • 610bfc6bc99bc83680d190ebc69359a05fc7f605 and later · before aea54d0bbe156d5ab7d00d68f66149ff41f4612aaffected · git
    • 610bfc6bc99bc83680d190ebc69359a05fc7f605 and later · before b54e459cf86943583c1aa2ee3081874e7ab1f5f3affected · git
    • 610bfc6bc99bc83680d190ebc69359a05fc7f605 and later · before 5418be6c2e117bf8a316582795a8e3ff90f45e5daffected · git
    • 610bfc6bc99bc83680d190ebc69359a05fc7f605 and later · before 5895ad21c7059a652da83fb817510f7a1e962abfaffected · git
    • 610bfc6bc99bc83680d190ebc69359a05fc7f605 and later · before 7138c35c9ad39a2fca6264af6b87466471f04ffcaffected · git
    • 610bfc6bc99bc83680d190ebc69359a05fc7f605 and later · before bc62216dc8e221e3781afa14430f45208bfa9af9affected · git
    • before 3.13not affected · semver
Affected versions · NVD (8)

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

  • linux linux kernel3.13 and later · before 5.10.258
  • linux linux kernel5.11 and later · before 5.15.209
  • linux linux kernel5.16 and later · before 6.1.175
  • linux linux kernel6.2 and later · before 6.6.142
  • linux linux kernel6.7 and later · before 6.12.92
  • linux linux kernel6.13 and later · before 6.18.34
  • linux linux kernel6.19 and later · before 7.0.11
  • linux linux kernel7.1

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 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.12-17.0.12-1

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-2026-52911Jun 21, 2026 · ksmbd: scope conn->binding slowpath to bound sessions only
    35Monitor
  • ← EarlierCVE-2026-52913Jun 24, 2026 · batman-adv: v: stop OGMv2 on disabled interface
    22Monitor
  • Later →CVE-2026-52919Jun 24, 2026 · batman-adv: fix tp_meter counter underflow during shutdown
    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 Linux0c208fa3859e3a33a1c38bebc41d021166e94ac8Vendor (CNA)
Linux Linux5418be6c2e117bf8a316582795a8e3ff90f45e5dVendor (CNA)
Linux Linux5895ad21c7059a652da83fb817510f7a1e962abfVendor (CNA)
Linux Linux7138c35c9ad39a2fca6264af6b87466471f04ffcVendor (CNA)
Linux Linuxaea54d0bbe156d5ab7d00d68f66149ff41f4612aVendor (CNA)
Linux Linuxb54e459cf86943583c1aa2ee3081874e7ab1f5f3Vendor (CNA)
Linux Linuxbc62216dc8e221e3781afa14430f45208bfa9af9Vendor (CNA)
Linux Linuxbcda4814dc6524283c0b958882cb963d75fe411dVendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.06.6.143.1-1 · 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.

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 · variant or chain candidate · 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)

—

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 (7 more)

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

All records