Description

In the Linux kernel, the following vulnerability has been resolved: net: enetc: Do not configure preemptible TCs if SIs do not support Both ENETC PF and VF drivers share enetc_setup_tc_mqprio() to configure MQPRIO. And enetc_setup_tc_mqprio() calls enetc_change_preemptible_tcs() to configure preemptible TCs. However, only PF is able to configure preemptible TCs. Because only PF has related registers, while VF does not have these registers. So for VF, its hw->port pointer is NULL. Therefore, VF will access an invalid pointer when accessing a non-existent register, which will cause a crash issue. The simplified log is as follows. root@ls1028ardb:~# tc qdisc add dev eno0vf0 parent root handle 100: \ mqprio num_tc 4 map 0 0 1 1 2 2 3 3 queues 1@0 1@1 1@2 1@3 hw 1 [ 187.290775] Unable to handle kernel paging request at virtual address 0000000000001f00 [ 187.424831] pc : enetc_mm_commit_preemptible_tcs+0x1c4/0x400 [ 187.430518] lr : enetc_mm_commit_preemptible_tcs+0x30c/0x400 [ 187.511140] Call trace: [ 187.513588] enetc_mm_commit_preemptible_tcs+0x1c4/0x400 [ 187.518918] enetc_setup_tc_mqprio+0x180/0x214 [ 187.523374] enetc_vf_setup_tc+0x1c/0x30 [ 187.527306] mqprio_enable_offload+0x144/0x178 [ 187.531766] mqprio_init+0x3ec/0x668 [ 187.535351] qdisc_create+0x15c/0x488 [ 187.539023] tc_modify_qdisc+0x398/0x73c [ 187.542958] rtnetlink_rcv_msg+0x128/0x378 [ 187.547064] netlink_rcv_skb+0x60/0x130 [ 187.550910] rtnetlink_rcv+0x18/0x24 [ 187.554492] netlink_unicast+0x300/0x36c [ 187.558425] netlink_sendmsg+0x1a8/0x420 [ 187.606759] ---[ end trace 0000000000000000 ]--- In addition, some PFs also do not support configuring preemptible TCs, such as eno1 and eno3 on LS1028A. It won't crash like it does for VFs, but we should prevent these PFs from accessing these unimplemented registers.

Metrics

 

CVSS Version 4.0 CVSS Version 3.x CVSS Version 2.0

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CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score:  5.5 MEDIUM

Vector:  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0 Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

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Hyperlink	Resource
https://git.kernel.org/stable/c/66127f0d1ecf00604aeab71132bde398fd9ec7c9	Patch
https://git.kernel.org/stable/c/b2420b8c81ec674552d00c55d46245e5c184b260	Patch
https://git.kernel.org/stable/c/b718b68a9964181e24d15138a09ce95785a19002	Patch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-476	NULL Pointer Dereference	NIST

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Change History

2 change records found show changes

Initial Analysis by NIST 1/06/2025 2:50:58 PM

Action	Type	Old Value	New Value
Added	CVSS V3.1		NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Added	CWE		NIST CWE-476
Added	CPE Configuration		OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.4 up to (excluding) 6.6.66 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.5 *cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
Changed	Reference Type	https://git.kernel.org/stable/c/66127f0d1ecf00604aeab71132bde398fd9ec7c9 No Types Assigned	https://git.kernel.org/stable/c/66127f0d1ecf00604aeab71132bde398fd9ec7c9 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/b2420b8c81ec674552d00c55d46245e5c184b260 No Types Assigned	https://git.kernel.org/stable/c/b2420b8c81ec674552d00c55d46245e5c184b260 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/b718b68a9964181e24d15138a09ce95785a19002 No Types Assigned	https://git.kernel.org/stable/c/b718b68a9964181e24d15138a09ce95785a19002 Patch

New CVE Received from kernel.org 12/27/2024 10:15:24 AM

Action	Type	Old Value	New Value
Added	Description		Record truncated, showing 500 of 1836 characters. View Entire Change Record In the Linux kernel, the following vulnerability has been resolved: net: enetc: Do not configure preemptible TCs if SIs do not support Both ENETC PF and VF drivers share enetc_setup_tc_mqprio() to configure MQPRIO. And enetc_setup_tc_mqprio() calls enetc_change_preemptible_tcs() to configure preemptible TCs. However, only PF is able to configure preemptible TCs. Because only PF has related registers, while VF does not have these registers. So for VF, its hw->port pointer is NULL. Therefore, VF
Added	Reference		https://git.kernel.org/stable/c/66127f0d1ecf00604aeab71132bde398fd9ec7c9
Added	Reference		https://git.kernel.org/stable/c/b2420b8c81ec674552d00c55d46245e5c184b260
Added	Reference		https://git.kernel.org/stable/c/b718b68a9964181e24d15138a09ce95785a19002