batman-adv: gw: acquire ethernet header only after skb realloc
Priority MEDIUM 40Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.004 34th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 5.10.261, 5.15.212, 6.1.178 +5
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 5 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-80601
- 2026-10-03 Alias added: GHSA-xq44-q9x4-cxw9
- 2026-10-18 CISA SSVC decision points changed
- 2026-10-18 Priority changed: LOW → MEDIUM
References
Other 8
- https://git.kernel.org/stable/c/2760b38222c8828b075802342fe3b91eb823d542
- https://git.kernel.org/stable/c/6c37f1166549c999ccd164b0cb6462d1ae68f8f6
- https://git.kernel.org/stable/c/b79884a5567bf788fb76c30832467cf6a56f3c0d
- https://git.kernel.org/stable/c/afac8096bde4948e3caa7e4dd733867cfbd3018e
- https://git.kernel.org/stable/c/e3f4325e35dd6e76b80665f3510738ce34819753
- https://git.kernel.org/stable/c/e6b43acd34b219b807e65096ce207b087942779d
- https://git.kernel.org/stable/c/916dac5f2944f63f07f7b501acbea6737dbbed0e
- https://git.kernel.org/stable/c/77880a3be88d378d60cc1e8f8ec70430e2ed0518
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Sources
- CVE-2026-80601 · CVE Program
- CVE-2026-80601 · NVD
- FIRST EPSS
- GHSA-xq44-q9x4-cxw9 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-80601 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences