CVE-2024-46857

MEDIUM EPSS 10.8%
Published Sep 27, 20241y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Sep 27, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix bridge mode operations when there are no VFs Currently, trying to set the bridge mode attribute when numvfs=0 leads to a crash: bridge link set dev eth2 hwmode vepa [ 168.967392] BUG: kernel NULL pointer dereference, address: 0000000000000030 [...] [ 168.969989] RIP: 0010:mlx5_add_flow_rules+0x1f/0x300 [mlx5_core] [...] [ 168.976037] Call Trace: [ 168.976188] <TASK> [ 168.978620] _mlx5_eswitch_set_vepa_locked+0x113/0x230 [mlx5_core] [ 168.979074] mlx5_eswitch_set_vepa+0x7f/0xa0 [mlx5_core] [ 168.979471] rtnl_bridge_setlink+0xe9/0x1f0 [ 168.979714] rtnetlink_rcv_msg+0x159/0x400 [ 168.980451] netlink_rcv_skb+0x54/0x100 [ 168.980675] netlink_unicast+0x241/0x360 [ 168.980918] netlink_sendmsg+0x1f6/0x430 [ 168.981162] ____sys_sendmsg+0x3bb/0x3f0 [ 168.982155] ___sys_sendmsg+0x88/0xd0 [ 168.985036] __sys_sendmsg+0x59/0xa0 [ 168.985477] do_syscall_64+0x79/0x150 [ 168.987273] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 168.987773] RIP: 0033:0x7f8f7950f917 (esw->fdb_table.legacy.vepa_fdb is null) The bridge mode is only relevant when there are multiple functions per port. Therefore, prevent setting and getting this setting when there are no VFs. Note that after this change, there are no settings to change on the PF interface using `bridge link` when there are no VFs, so the interface no longer appears in the `bridge link` output.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
10.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 10

VendorProductVersionRange
linuxlinux_kernel*≥5.1  –  <6.1.111
linuxlinux_kernel*≥6.2  –  <6.6.52
linuxlinux_kernel*≥6.7  –  <6.10.11
linuxlinux_kernel6.11any
linuxlinux_kernel6.11any
linuxlinux_kernel6.11any
linuxlinux_kernel6.11any
linuxlinux_kernel6.11any
linuxlinux_kernel6.11any
linuxlinux_kernel6.11any

References 5

  • git.kernel.org https://git.kernel.org/stable/c/505ae01f75f839b54329164bbfecf24cc1361b31
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/52c4beb79e095e0631b5cac46ed48a2aefe51985
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/65feee671e37f3b6eda0b6af28f204b5bcf7fa50
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b1d305abef4640af1b4f1b4774d513cd81b10cfc
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/505ae01f75f839b54329164bbfecf24cc1361b31
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/52c4beb79e095e0631b5cac46ed48a2aefe51985
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/65feee671e37f3b6eda0b6af28f204b5bcf7fa50
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b1d305abef4640af1b4f1b4774d513cd81b10cfc
    Patch