CVE-2026-89950batman-adv: mcast: linearize skbuff for packet generation
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: batman-adv: mcast: linearize skbuff for packet generation batadv_mcast_forw_packet() and batadv_mcast_forw_scrape() is not only called (indirectly) by the unsharing+linearizing batadv_recv_mcast_packet() handler. When it is called (indirectly) by batadv_mcast_forw_mcsend() then it will be unshared but not linearized. The SKB_LINEAR_ASSERT() can therefore cause a fatal BUG(). The linearization should happen during the expansion of the head because the scrape function can be hit already during the initial batadv_mcast_forw_mode() selection code: * batadv_interface_tx * batadv_mcast_forw_mode * batadv_mcast_forw_mode_by_count() * batadv_mcast_forw_push() -> calls batadv_mcast_forw_expand_head() before everything else * batadv_mcast_forw_push_tvlvs() * batadv_mcast_forw_push_dests() * batadv_mcast_forw_push_adjust_padding() * batadv_mcast_forw_scrape()
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 90039133221e33964ccb4a536dad7eb0a372fff7 before a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e; from 90039133221e33964ccb4a536dad7eb0a372fff7 before c32e5e25c41201c8c3b796a4ab2c45103187091e; 90039133221e33964ccb4a536dad7eb0a372fff7 builds before 2879177539e3ece483a8e5406970373698e9a6c5; 90039133221e33964ccb4a536dad7eb0a372fff7 builds before 6a30a59e2660afd03c975f1b8eae6a2301161197 | CNA record |
References
- https://git.kernel.org/stable/c/a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e
- https://git.kernel.org/stable/c/c32e5e25c41201c8c3b796a4ab2c45103187091e
- https://git.kernel.org/stable/c/2879177539e3ece483a8e5406970373698e9a6c5
- https://git.kernel.org/stable/c/6a30a59e2660afd03c975f1b8eae6a2301161197
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.