# CVE-2021-47102: linux: In the Linux kernel, the following vulnerability has been resolved:  net: marvell: prestera: fix incorrect structure...

CVE-2021-47102 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47102, released March 4, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47102
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0033
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 4, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: marvell: prestera: fix incorrect structure access  In line: 	upper = info->upper_dev; We access upper_dev field, which is related only for particular events (e.g. event == NETDEV_CHANGEUPPER). So, this line cause invalid memory access for another events, when ptr is not netdev_notifier_changeupper_info.  The KASAN logs are as follows:  [   30.123165] BUG: KASAN: stack-out-of-bounds in prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera] [   30.133336] Read of size 8 at addr ffff80000cf772b0 by task udevd/778 [   30.139866] [   30.141398] CPU: 0 PID: 778 Comm: udevd Not tainted 5.16.0-rc3 #6 [   30.147588] Hardware name: DNI AmazonGo1 A7040 board (DT) [   30.153056] Call trace: [   30.155547]  dump_backtrace+0x0/0x2c0 [   30.159320]  show_stack+0x18/0x30 [   30.162729]  dump_stack_lvl+0x68/0x84 [   30.166491]  print_address_description.constprop.0+0x74/0x2b8 [   30.172346]  kasan_report+0x1e8/0x250 [   30.176102]  __asan_load8+0x98/0xe0 [   30.179682]  prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera] [   30.186847]  prestera_netdev_event_handler+0x1b4/0x1c0 [prestera] [   30.193313]  raw_notifier_call_chain+0x74/0xa0 [   30.197860]  call_netdevice_notifiers_info+0x68/0xc0 [   30.202924]  register_netdevice+0x3cc/0x760 [   30.207190]  register_netdev+0x24/0x50 [   30.211015]  prestera_device_register+0x8a0/0xba0 [prestera]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.15-1 | [DEBIAN-CVE-2021-47102](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47102.md) | Mar 4, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.15-1 | [DEBIAN-CVE-2021-47102](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47102.md) | Mar 4, 2024 |
| Linux | linux Debian 14 | 5.15.15-1 | [DEBIAN-CVE-2021-47102](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47102.md) | Mar 4, 2024 |

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