# CVE-2021-47438: linux: In the Linux kernel, the following vulnerability has been resolved:  net/mlx5e: Fix memory leak in mlx5_core_destroy_...

CVE-2021-47438 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47438, released May 22, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47438
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 22, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  net/mlx5e: Fix memory leak in mlx5_core_destroy_cq() error path  Prior to this patch in case mlx5_core_destroy_cq() failed it returns without completing all destroy operations and that leads to memory leak. Instead, complete the destroy flow before return error.  Also move mlx5_debug_cq_remove() to the beginning of mlx5_core_destroy_cq() to be symmetrical with mlx5_core_create_cq().  kmemleak complains on:  unreferenced object 0xc000000038625100 (size 64):   comm "ethtool", pid 28301, jiffies 4298062946 (age 785.380s)   hex dump (first 32 bytes):     60 01 48 94 00 00 00 c0 b8 05 34 c3 00 00 00 c0  `.H.......4.....     02 00 00 00 00 00 00 00 00 db 7d c1 00 00 00 c0  ..........}.....   backtrace:     [<000000009e8643cb>] add_res_tree+0xd0/0x270 [mlx5_core]     [<00000000e7cb8e6c>] mlx5_debug_cq_add+0x5c/0xc0 [mlx5_core]     [<000000002a12918f>] mlx5_core_create_cq+0x1d0/0x2d0 [mlx5_core]     [<00000000cef0a696>] mlx5e_create_cq+0x210/0x3f0 [mlx5_core]     [<000000009c642c26>] mlx5e_open_cq+0xb4/0x130 [mlx5_core]     [<0000000058dfa578>] mlx5e_ptp_open+0x7f4/0xe10 [mlx5_core]     [<0000000081839561>] mlx5e_open_channels+0x9cc/0x13e0 [mlx5_core]     [<0000000009cf05d4>] mlx5e_switch_priv_channels+0xa4/0x230 [mlx5_core]     [<0000000042bbedd8>] mlx5e_safe_switch_params+0x14c/0x300 [mlx5_core]     [<0000000004bc9db8>] set_pflag_tx_port_ts+0x9c/0x160 [mlx5_core]     [<00000000a0553443>] mlx5e_set_priv_flags+0xd0/0x1b0 [mlx5_core]     [<00000000a8f3d84b>] ethnl_set_privflags+0x234/0x2d0     [<00000000fd27f27c>] genl_family_rcv_msg_doit+0x108/0x1d0     [<00000000f495e2bb>] genl_family_rcv_msg+0xe4/0x1f0     [<00000000646c5c2c>] genl_rcv_msg+0x78/0x120     [<00000000d53e384e>] netlink_rcv_skb+0x74/0x1a0

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.16-1 | [DEBIAN-CVE-2021-47438](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47438.md) | May 22, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.16-1 | [DEBIAN-CVE-2021-47438](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47438.md) | May 22, 2024 |
| Linux | linux Debian 14 | 5.14.16-1 | [DEBIAN-CVE-2021-47438](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47438.md) | May 22, 2024 |

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