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Fencer Vulns
medium 5.5

CVE-2026-64092 json

batman-adv: tp_meter: fix tp_vars reference leak in receiver shutdown

published 2026-07-19 3 mo ago modified 2026-08-11 2 mo ago also EUVD-2026-45777

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

batman-adv: tp_meter: fix tp_vars reference leak in receiver shutdown

The receiver shutdown timer handler, batadv_tp_receiver_shutdown(), is responsible for releasing the tp_vars reference it holds. However, the existing logic for coordinating this release with batadv_tp_stop_all() was flawed.

timer_shutdown_sync() guarantees the timer will not fire again after it returns, but it returns non-zero only when the timer was pending at the time of the call. If the timer had already expired (and batadv_tp_stop_all() would unsucessfully try to rearm itself), batadv_tp_stop_all() skips its batadv_tp_vars_put(), and batadv_tp_receiver_shutdown() fails to put its own reference as well.

Fix this by introducing a new atomic variable receiving that is set to 1 when the receiver is initialized and cleared atomically with atomic_xchg() by whichever side claims it first. Only the side that observes the transition from 1 to 0 is responsible for releasing the tp_vars timer reference, eliminating the uncertainty.

Patch / fix

  • Linux Linux 5.11, 6.6.142, 6.12.92, 6.18.34, 7.0.11
  • linux Debian 13 6.12.94-1
  • linux Debian 14 7.0.12-1

debian advisories DEBIAN-CVE-2026-64092

  • linux Ubuntu 24.04 LTS 6.8.0-139.139
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1064.67
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1067.75
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1062.70
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1064.65
  • linux-azure Ubuntu 24.04 LTS 6.8.0-1067.75
  • linux-gkeop Ubuntu 24.04 LTS 6.8.0-1049.53
  • linux-raspi Ubuntu 24.04 LTS 6.8.0-1064.68

ubuntu advisories UBUNTU-CVE-2026-64092

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-64092 updated

kernel: batman-adv: tp_meter: fix tp_vars reference leak in receiver shutdown

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.