batman-adv: access unicast_ttvn skb->data only after skb realloc

Summary

In the Linux kernel, the following vulnerability has been resolved: batman-adv: access unicast_ttvn skb->data 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. This was done correctly for the ethernet header but missed for the unicast_packet pointer.

Timeline

1. Aug 15, 2026, 5:54 AM UTCCVE published
2. Oct 16, 2026, 6:44 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: total

3. Oct 16, 2026, 6:45 PM UTCRecord last updated

Affected versions

• Linux Linux

  From c018ad3de61a1dc4194879a53e5559e094aa7b1a · fixed in aa9558af859934f24717d4bab97d61004f91a736; From c018ad3de61a1dc4194879a53e5559e094aa7b1a · fixed in 9c2c05629e46c1fd43931506d41c56a885a98eb4; From c018ad3de61a1dc4194879a53e5559e094aa7b1a · fixed in 7b162b36de750565404cd3b98315706622c6974f; From c018ad3de61a1dc4194879a53e5559e094aa7b1a · fixed in ed90eb5c68420cdfe67ec1f773324198d2ef6f50; From c018ad3de61a1dc4194879a53e5559e094aa7b1a · fixed in 979175834a699ccc3c4c0b0ba60ecae0f135a587; From c018ad3de61a1dc4194879a53e5559e094aa7b1a · fixed in b8afcf799b2cc92c41beebd029e53ed18960184a; From c018ad3de61a1dc4194879a53e5559e094aa7b1a · fixed in 9a7b7248798123efbd5fafe58461d57c7cc718af; From c018ad3de61a1dc4194879a53e5559e094aa7b1a · fixed in 7141990add3f75436f2933cb310654cad3b1e3e9

• Linux Linux

  3.13

• KernelLinux

  From 3.13.0 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8