# CVE-2021-47183: linux: In the Linux kernel, the following vulnerability has been resolved:  scsi: lpfc: Fix link down processing to address...

CVE-2021-47183 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47183, released April 10, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47183
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0034
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 10, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  scsi: lpfc: Fix link down processing to address NULL pointer dereference  If an FC link down transition while PLOGIs are outstanding to fabric well known addresses, outstanding ABTS requests may result in a NULL pointer dereference. Driver unload requests may hang with repeated "2878" log messages.  The Link down processing results in ABTS requests for outstanding ELS requests. The Abort WQEs are sent for the ELSs before the driver had set the link state to down. Thus the driver is sending the Abort with the expectation that an ABTS will be sent on the wire. The Abort request is stalled waiting for the link to come up. In some conditions the driver may auto-complete the ELSs thus if the link does come up, the Abort completions may reference an invalid structure.  Fix by ensuring that Abort set the flag to avoid link traffic if issued due to conditions where the link failed.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.5-1 | [DEBIAN-CVE-2021-47183](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47183.md) | Apr 10, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.5-1 | [DEBIAN-CVE-2021-47183](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47183.md) | Apr 10, 2024 |
| Linux | linux Debian 14 | 5.15.5-1 | [DEBIAN-CVE-2021-47183](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47183.md) | Apr 10, 2024 |

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