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Review reviewHigh

CVE-2026-64095

Linux

In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: avoid double decrement of bla.num_requests The bla.num_requests is increased when no request_sent was in progress. And it is decremented in various places (announcement was received, backbone is purged, periodic work). But the check if the request_sent is actually set to a specific state and the atomic_dec/_inc are not safe because they are not atomic (TOCTOU) and multiple such code portions can run concurrently. At the same time, it is necessary to modify request_sent (state) and bla.num_requests atomicall...

CVSS
7.1
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: avoid double decrement of bla.num_requests The bla.num_requests is increased when no request_sent was in progress. And it is decremented in various places (announcement was received, backbone is purged, periodic work). But the check if the request_sent is actually set to a specific state and the atomic_dec/_inc are not safe because they are not atomic (TOCTOU) and multiple such code portions can run concurrently. At the same time, it is necessary to modify request_sent (state) and bla.num_requests atomicall...

Affected product and versions

Product
Linux
Affected versions
>= 23721387c409087fd3b97e274f34d3ddc0970b74 < 1f013bc94154f2e78e97d0296175664224c796e0, >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 5328b95960774f2e189f22485616bc7b8eb2f7e3, >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 8ff9c59d1b7b48c2596878341a5310f32895d52b, >= 23721387c409087fd3b97e274f34d3ddc0970b74 < a9393751ecf7e9096f93cb6eed02db4f79125765, >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 461f1e3dfb888701895b766446c55db2b10db705, >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 45384612f29692fbf0c770200361a7acff90125c, >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 65497ad155a3246df177b5ef662cd6e5a32cb470, >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 83ab69bd12b80f6ea169c8bea6977701b53a043d, >= 3.5
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
CWE
Not available
CVE-2026-64095 — Linux | SECUFOCUS NOW