# CVE-2021-46931: linux: In the Linux kernel, the following vulnerability has been resolved:  net/mlx5e: Wrap the tx reporter dump callback to...

CVE-2021-46931 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-46931, released February 27, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-46931
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 27, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  net/mlx5e: Wrap the tx reporter dump callback to extract the sq  Function mlx5e_tx_reporter_dump_sq() casts its void * argument to struct mlx5e_txqsq *, but in TX-timeout-recovery flow the argument is actually of type struct mlx5e_tx_timeout_ctx *.   mlx5_core 0000:08:00.1 enp8s0f1: TX timeout detected  mlx5_core 0000:08:00.1 enp8s0f1: TX timeout on queue: 1, SQ: 0x11ec, CQ: 0x146d, SQ Cons: 0x0 SQ Prod: 0x1, usecs since last trans: 21565000  BUG: stack guard page was hit at 0000000093f1a2de (stack is 00000000b66ea0dc..000000004d932dae)  kernel stack overflow (page fault): 0000 [#1] SMP NOPTI  CPU: 5 PID: 95 Comm: kworker/u20:1 Tainted: G W OE 5.13.0_mlnx #1  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014  Workqueue: mlx5e mlx5e_tx_timeout_work [mlx5_core]  RIP: 0010:mlx5e_tx_reporter_dump_sq+0xd3/0x180  [mlx5_core]  Call Trace:  mlx5e_tx_reporter_dump+0x43/0x1c0 [mlx5_core]  devlink_health_do_dump.part.91+0x71/0xd0  devlink_health_report+0x157/0x1b0  mlx5e_reporter_tx_timeout+0xb9/0xf0 [mlx5_core]  ? mlx5e_tx_reporter_err_cqe_recover+0x1d0/0x1d0  [mlx5_core]  ? mlx5e_health_queue_dump+0xd0/0xd0 [mlx5_core]  ? update_load_avg+0x19b/0x550  ? set_next_entity+0x72/0x80  ? pick_next_task_fair+0x227/0x340  ? finish_task_switch+0xa2/0x280    mlx5e_tx_timeout_work+0x83/0xb0 [mlx5_core]    process_one_work+0x1de/0x3a0    worker_thread+0x2d/0x3c0  ? process_one_work+0x3a0/0x3a0    kthread+0x115/0x130  ? kthread_park+0x90/0x90    ret_from_fork+0x1f/0x30  --[ end trace 51ccabea504edaff ]---  RIP: 0010:mlx5e_tx_reporter_dump_sq+0xd3/0x180  PKRU: 55555554  Kernel panic - not syncing: Fatal exception  Kernel Offset: disabled  end Kernel panic - not syncing: Fatal exception  To fix this bug add a wrapper for mlx5e_tx_reporter_dump_sq() which extracts the sq from struct mlx5e_tx_timeout_ctx and set it as the TX-timeout-recovery flow dump callback.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.15-1 | [DEBIAN-CVE-2021-46931](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46931.md) | Feb 27, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.15-1 | [DEBIAN-CVE-2021-46931](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46931.md) | Feb 27, 2024 |
| Linux | linux Debian 14 | 5.15.15-1 | [DEBIAN-CVE-2021-46931](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46931.md) | Feb 27, 2024 |

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