CVE-2026-31659Network attack vector

Kernel compromise via wrapped TT allocation

Published Apr 24, 2026 · Updated Apr 24, 2026

Heap out-of-bounds write in Linux Kernel allows remote attackers to compromise the kernel through an oversized global TT response. batadv_tt_prepare_tvlv_global_data() calculates the allocation length in 16-bit temporaries, wraps the payload length before kmalloc(), then copies the original-length TT data beyond the heap object. The attacker must participate as a remote batman-adv originator and advertise a sufficiently large global translation table.

CVSS severity9.8
Critical
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap out-of-bounds write in Linux Kernel allows remote attackers to compromise the kernel through an oversized global TT response. batadv_tt_prepare_tvlv_global_data() calculates the allocation length in 16-bit temporaries, wraps the payload length before kmalloc(), then copies the original-length TT data beyond the heap object. The attacker must participate as a remote batman-adv originator and advertise a sufficiently large global translation table.

The record

CVE
CVE-2026-31659
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.13
  2. Affected versionversion=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <2997f4bd1f982e7013709946e00be89b507693fa
  3. Affected versionversion=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <3a359bf5c61d52e7f09754108309d637532164a6
  4. Affected versionversion=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <69d61639bc7e963c3b645e570279d731e7c89062
  5. Affected versionversion=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <7e5d007e0df946bffb8542fb112e0044014a5897
  6. Affected versionversion=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <95c71365a2222908441b54d6f2c315e0c79fcec3
  7. Affected versionversion=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <cf2199171ef799ca7270019125f4a91bd20ad4d9
  8. Affected versionversion=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <de6c1dc3c7d01a152607e6fcecee4d5288283f10
  9. Affected versionversion=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <f970646b9a39539d1bac86822ac78b5915455ea9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.13; version=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <2997f4bd1f982e7013709946e00be89b507693fa; version=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <3a359bf5c61d52e7f09754108309d637532164a6; version=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <69d61639bc7e963c3b645e570279d731e7c89062; version=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <7e5d007e0df946bffb8542fb112e0044014a5897; version=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <95c71365a2222908441b54d6f2c315e0c79fcec3; version=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <cf2199171ef799ca7270019125f4a91bd20ad4d9; version=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <de6c1dc3c7d01a152607e6fcecee4d5288283f10; version=7ea7b4a142758deaf46c1af0ca9ceca6dd55138b <f970646b9a39539d1bac86822ac78b5915455ea9

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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