CVSS 7.1 · High EPSS 0,23%
Kerentanan Out-of-bounds Read pada linux kernel. Skor CVSS 3.1 7.1 (High) menurut NVD.
In the Linux kernel, the following vulnerability has been resolved: vlan: enforce underlying device type Currently, VLAN devices can be created on top of non-ethernet devices. Besides the fact that it doesn't make much sense, this also causes a bug which leaks the address of a kernel function to usermode. When creating a VLAN device, we initialize GARP (garp_init_applicant) and MRP (mrp_init_applicant) for the underlying device. As part of the initialization process, we add the multicast address of each applicant to the underlying device, by calling dev_mc_add. __dev_mc_add uses dev->addr_len to determine the length of the new multicast address. This causes an out-of-bounds read if dev->addr_len is greater than 6, since the multicast addresses provided by GARP and MRP are only 6 bytes long. This behaviour can be reproduced using the following commands: ip tunnel add gretest mode ip6gre local ::1 remote ::2 dev lo ip l set up dev gretest ip link add link gretest name vlantest type vlan id 100 Then, the following command will display the address of garp_pdu_rcv: ip maddr show | grep 01:80:c2:00:00:21 Fix the bug by enforcing the type of the underlying device during VLAN device initialization.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 2.6.35 hingga sebelum 5.4.291 |
| linux | linux kernel | Versi 5.5 hingga sebelum 5.10.235 |
| linux | linux kernel | Versi 5.11 hingga sebelum 5.15.179 |
| linux | linux kernel | Versi 5.16 hingga sebelum 6.1.131 |
| linux | linux kernel | Versi 6.2 hingga sebelum 6.6.83 |
| linux | linux kernel | Versi 6.7 hingga sebelum 6.12.19 |
| linux | linux kernel | Versi 6.13 hingga sebelum 6.13.7 |
| linux | linux kernel | Versi 6.14 rc1 |
| linux | linux kernel | Versi 6.14 rc2 |
| linux | linux kernel | Versi 6.14 rc3 |
| linux | linux kernel | Versi 6.14 rc4 |
| linux | linux kernel | Versi 6.14 rc5 |