CVE-2026-64093

Adjacent kernel memory corruption via re-armed timer

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in Linux kernel batman-adv allows adjacent attackers to corrupt kernel memory through timed throughput-meter ACKs. A cleanup race lets batadv_tp_reset_sender_timer() re-arm the sender timer after batadv_tp_sender_cleanup() releases its reference, so the callback later dereferences freed memory. Reachability requires an active throughput-meter session and a mesh peer able to time ACK traffic during teardown; outcomes include kernel memory read or write, control-flow hijacking, and panic.

CVSS severity8.8
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel batman-adv allows adjacent attackers to corrupt kernel memory through timed throughput-meter ACKs. A cleanup race lets batadv_tp_reset_sender_timer() re-arm the sender timer after batadv_tp_sender_cleanup() releases its reference, so the callback later dereferences freed memory. Reachability requires an active throughput-meter session and a mesh peer able to time ACK traffic during teardown; outcomes include kernel memory read or write, control-flow hijacking, and panic.

The record

CVE
CVE-2026-64093
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c
  2. Affected versionversion=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <5bc2d50fb66b46f86543d5153a188eb1486d0b6e
  3. Affected versionversion=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <74a76634055462833446684fd526d73c290ea43a
  4. Affected versionversion=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <770bf0a35f0620b526fd4193889d1e77084e4c43
  5. Affected versionversion=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <933880a8bc9b4042223a79255c0b1021cdc36991
  6. Affected versionversion=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <d5487249a81ea658717614009c8f46acc5b7101a
  7. Affected versionversion=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <f86b20ec8d17d77bddc02c5c86cfa2389d84ecff
  8. Affected versionversion=4.8

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c; version=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <5bc2d50fb66b46f86543d5153a188eb1486d0b6e; version=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <74a76634055462833446684fd526d73c290ea43a; version=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <770bf0a35f0620b526fd4193889d1e77084e4c43; version=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <933880a8bc9b4042223a79255c0b1021cdc36991; version=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <d5487249a81ea658717614009c8f46acc5b7101a; version=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <f86b20ec8d17d77bddc02c5c86cfa2389d84ecff; version=4.8

Published CVSS scores

8.8kernel.orgCVSS:3.1/AV:A/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

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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