# CVE-2022-48645: linux: In the Linux kernel, the following vulnerability has been resolved:  net: enetc: deny offload of tc-based TSN feature...

CVE-2022-48645 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48645, released April 28, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48645
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 28, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: enetc: deny offload of tc-based TSN features on VF interfaces  TSN features on the ENETC (taprio, cbs, gate, police) are configured through a mix of command BD ring messages and port registers: enetc_port_rd(), enetc_port_wr().  Port registers are a region of the ENETC memory map which are only accessible from the PCIe Physical Function. They are not accessible from the Virtual Functions.  Moreover, attempting to access these registers crashes the kernel:  $ echo 1 > /sys/bus/pci/devices/0000\:00\:00.0/sriov_numvfs pci 0000:00:01.0: [1957:ef00] type 00 class 0x020001 fsl_enetc_vf 0000:00:01.0: Adding to iommu group 15 fsl_enetc_vf 0000:00:01.0: enabling device (0000 -> 0002) fsl_enetc_vf 0000:00:01.0 eno0vf0: renamed from eth0 $ tc qdisc replace dev eno0vf0 root taprio num_tc 8 map 0 1 2 3 4 5 6 7 \ 	queues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 base-time 0 \ 	sched-entry S 0x7f 900000 sched-entry S 0x80 100000 flags 0x2 Unable to handle kernel paging request at virtual address ffff800009551a08 Internal error: Oops: 96000007 [#1] PREEMPT SMP pc : enetc_setup_tc_taprio+0x170/0x47c lr : enetc_setup_tc_taprio+0x16c/0x47c Call trace:  enetc_setup_tc_taprio+0x170/0x47c  enetc_setup_tc+0x38/0x2dc  taprio_change+0x43c/0x970  taprio_init+0x188/0x1e0  qdisc_create+0x114/0x470  tc_modify_qdisc+0x1fc/0x6c0  rtnetlink_rcv_msg+0x12c/0x390  Split enetc_setup_tc() into separate functions for the PF and for the VF drivers. Also remove enetc_qos.o from being included into enetc-vf.ko, since it serves absolutely no purpose there.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.2-1 | [DEBIAN-CVE-2022-48645](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48645.md) | Apr 28, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.0.2-1 | [DEBIAN-CVE-2022-48645](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48645.md) | Apr 28, 2024 |
| Linux | linux Debian 14 | 6.0.2-1 | [DEBIAN-CVE-2022-48645](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48645.md) | Apr 28, 2024 |

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