# CVE-2021-47077: linux: In the Linux kernel, the following vulnerability has been resolved:  scsi: qedf: Add pointer checks in qedf_update_li...

CVE-2021-47077 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47077, released March 1, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47077
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 1, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  scsi: qedf: Add pointer checks in qedf_update_link_speed()  The following trace was observed:   [   14.042059] Call Trace:  [   14.042061]  <IRQ>  [   14.042068]  qedf_link_update+0x144/0x1f0 [qedf]  [   14.042117]  qed_link_update+0x5c/0x80 [qed]  [   14.042135]  qed_mcp_handle_link_change+0x2d2/0x410 [qed]  [   14.042155]  ? qed_set_ptt+0x70/0x80 [qed]  [   14.042170]  ? qed_set_ptt+0x70/0x80 [qed]  [   14.042186]  ? qed_rd+0x13/0x40 [qed]  [   14.042205]  qed_mcp_handle_events+0x437/0x690 [qed]  [   14.042221]  ? qed_set_ptt+0x70/0x80 [qed]  [   14.042239]  qed_int_sp_dpc+0x3a6/0x3e0 [qed]  [   14.042245]  tasklet_action_common.isra.14+0x5a/0x100  [   14.042250]  __do_softirq+0xe4/0x2f8  [   14.042253]  irq_exit+0xf7/0x100  [   14.042255]  do_IRQ+0x7f/0xd0  [   14.042257]  common_interrupt+0xf/0xf  [   14.042259]  </IRQ>  API qedf_link_update() is getting called from QED but by that time shost_data is not initialised. This results in a NULL pointer dereference when we try to dereference shost_data while updating supported_speeds.  Add a NULL pointer check before dereferencing shost_data.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.40-1 | [DEBIAN-CVE-2021-47077](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47077.md) | Mar 1, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.40-1 | [DEBIAN-CVE-2021-47077](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47077.md) | Mar 1, 2024 |
| Linux | linux Debian 14 | 5.10.40-1 | [DEBIAN-CVE-2021-47077](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47077.md) | Mar 1, 2024 |

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