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

batman-adv: gw: acquire ethernet header only after skb realloc

The pskb_may_pull() called by batadv_get_vid() could reallocate the buffer
behind the skb. Variables which were pointing to the old buffer need to be
reassigned to avoid an use-after-free.
Published: 2026-08-28
Score: 8.8 High
EPSS: < 1% Very Low
KEV: No
Impact: Use‑After‑Free causing kernel memory corruption
Action: Apply Patch
AI Analysis

Impact

In the batman‑adv networking module of the Linux kernel, a bug in batadv_get_vid() can trigger a use‑after‑free when the helper function pskb_may_pull() reallocates the socket buffer. Pointers that were saved to the old buffer become dangling, so subsequent use corrupts kernel memory. This type of fault can lead to a system crash or, if attacker input can control the freed region, it may be exploitable for privilege escalation over the kernel.

Affected Systems

Any Linux kernel build that includes the batman‑adv module is potentially affected. The CVE does not list specific kernel versions, so any configuration that loads batman‑adv remains at risk until the patch is applied.

Risk and Exploitability

The vulnerability has a CVSS score of 8.8, indicating high severity. The EPSS score is below 1%, suggesting a very low exploitation probability at present. It is not listed in the CISA KEV catalog. The likely attack vector is network‑based, requiring an attacker to inject or manipulate traffic processed by batman‑adv. The risk remains if no patch or module removal is performed, though active exploitation appears uncommon.

Generated by OpenCVE AI on September 2, 2026 at 05:44 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the kernel patch that fixes the batman‑adv use‑after‑free, for example by updating to a kernel release that includes commits 2760b38222c8828b075802342fe3b91eb823d542 and the related patches listed in the advisory.
  • If a kernel update is not immediately possible, unload or blacklist the batman‑adv module (`modprobe -r batadv` or add `blacklist batadv` to `/etc/modprobe.d/blacklist.conf`) to prevent the vulnerable code from loading.
  • Restrict untrusted traffic from reaching batman‑adv by configuring firewall rules (e.g., using iptables or nftables) to limit the interfaces and protocols that batman‑adv processes, reducing the attack surface until patch application.

Generated by OpenCVE AI on September 2, 2026 at 05:44 UTC.

Tracking

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Advisories

No advisories yet.

History

Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Tue, 01 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-825
References
Metrics threat_severity

None

threat_severity

Moderate


Sat, 29 Aug 2026 06:45:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Fri, 28 Aug 2026 18:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Fri, 28 Aug 2026 14:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Fri, 28 Aug 2026 10:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Fri, 28 Aug 2026 07:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: batman-adv: gw: acquire ethernet header only after skb realloc The pskb_may_pull() called by batadv_get_vid() could reallocate the buffer behind the skb. Variables which were pointing to the old buffer need to be reassigned to avoid an use-after-free.
Title batman-adv: gw: acquire ethernet header only after skb realloc
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Subscriptions

Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-29T06:21:13.415Z

Reserved: 2026-08-26T14:34:25.771Z

Link: CVE-2026-80601

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-28T08:16:43.947

Modified: 2026-08-29T07:16:45.190

Link: CVE-2026-80601

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-08-28T00:00:00Z

Links: CVE-2026-80601 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-02T05:45:04Z

Weaknesses
  • CWE-825

    Expired Pointer Dereference