# CVE-2021-47564: linux: In the Linux kernel, the following vulnerability has been resolved:  net: marvell: prestera: fix double free issue on...

CVE-2021-47564 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47564, released May 24, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47564
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 24, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: marvell: prestera: fix double free issue on err path  fix error path handling in prestera_bridge_port_join() that cases prestera driver to crash (see below).   Trace:    Internal error: Oops: 96000044 [#1] SMP    Modules linked in: prestera_pci prestera uio_pdrv_genirq    CPU: 1 PID: 881 Comm: ip Not tainted 5.15.0 #1    pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)    pc : prestera_bridge_destroy+0x2c/0xb0 [prestera]    lr : prestera_bridge_port_join+0x2cc/0x350 [prestera]    sp : ffff800011a1b0f0    ...    x2 : ffff000109ca6c80 x1 : dead000000000100 x0 : dead000000000122     Call trace:    prestera_bridge_destroy+0x2c/0xb0 [prestera]    prestera_bridge_port_join+0x2cc/0x350 [prestera]    prestera_netdev_port_event.constprop.0+0x3c4/0x450 [prestera]    prestera_netdev_event_handler+0xf4/0x110 [prestera]    raw_notifier_call_chain+0x54/0x80    call_netdevice_notifiers_info+0x54/0xa0    __netdev_upper_dev_link+0x19c/0x380

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.15-1 | [DEBIAN-CVE-2021-47564](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47564.md) | May 24, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.15-1 | [DEBIAN-CVE-2021-47564](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47564.md) | May 24, 2024 |
| Linux | linux Debian 14 | 5.15.15-1 | [DEBIAN-CVE-2021-47564](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47564.md) | May 24, 2024 |

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