# CVE-2024-43862: linux: In the Linux kernel, the following vulnerability has been resolved:  net: wan: fsl_qmc_hdlc: Convert carrier_lock spi...

CVE-2024-43862 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-43862, released August 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-43862
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0014
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: wan: fsl_qmc_hdlc: Convert carrier_lock spinlock to a mutex  The carrier_lock spinlock protects the carrier detection. While it is held, framer_get_status() is called which in turn takes a mutex. This is not correct and can lead to a deadlock.  A run with PROVE_LOCKING enabled detected the issue:   [ BUG: Invalid wait context ]   ...   c204ddbc (&framer->mutex){+.+.}-{3:3}, at: framer_get_status+0x40/0x78   other info that might help us debug this:   context-{4:4}   2 locks held by ifconfig/146:   #0: c0926a38 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x12c/0x664   #1: c2006a40 (&qmc_hdlc->carrier_lock){....}-{2:2}, at: qmc_hdlc_framer_set_carrier+0x30/0x98  Avoid the spinlock usage and convert carrier_lock to a mutex.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.10.4-1 | [DEBIAN-CVE-2024-43862](https://patchblox.com/security/data/fix/linux/debian-cve-2024-43862.md) | Aug 21, 2024 |
| Linux | linux Debian 14 | 6.10.4-1 | [DEBIAN-CVE-2024-43862](https://patchblox.com/security/data/fix/linux/debian-cve-2024-43862.md) | Aug 21, 2024 |

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