In the Linux kernel, the following vulnerability has been resolved:
batman-adv: retrieve ethhdr after potential skb realloc on RX
pskb_may_pull() in batadv_interface_rx() 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 VLAN header but missed for the ethernet
header which is later used for the TT and AP isolation handling.
Attack Parameters
Attack Vector
Adjacent
Requires local network access
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
References 8
https://git.kernel.org/stable/c/035e1fed892d3d06002a73ff73668f618a514644
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/2cefa5141cab8ec1e4b24cf585958b13f2e3049d
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/6abf73589bed3f27ee240c08108feb72bed0b9c6
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/6e189f14d1ea28db212b9d70a02131a7ce518012
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/85a71a81854e0e191ad0e533eabb4eff54866feb
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/a1820344b180cb55af748f102bc536b5c93164db
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/b031fc97e1993d29d6c3a0e86a99140528cf31e8
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/f19259395b44af67f3c274e34237c295b526b859
416baaa9-dc9f-4396-8d5f-8c081fb06d67