# CVE-2021-47481: linux: In the Linux kernel, the following vulnerability has been resolved:  RDMA/mlx5: Initialize the ODP xarray when creati...

CVE-2021-47481 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47481, released May 22, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47481
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0018
- 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:  RDMA/mlx5: Initialize the ODP xarray when creating an ODP MR  Normally the zero fill would hide the missing initialization, but an errant set to desc_size in reg_create() causes a crash:    BUG: unable to handle page fault for address: 0000000800000000   PGD 0 P4D 0   Oops: 0000 [#1] SMP PTI   CPU: 5 PID: 890 Comm: ib_write_bw Not tainted 5.15.0-rc4+ #47   Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014   RIP: 0010:mlx5_ib_dereg_mr+0x14/0x3b0 [mlx5_ib]   Code: 48 63 cd 4c 89 f7 48 89 0c 24 e8 37 30 03 e1 48 8b 0c 24 eb a0 90 0f 1f 44 00 00 41 56 41 55 41 54 55 53 48 89 fb 48 83 ec 30 <48> 8b 2f 65 48 8b 04 25 28 00 00 00 48 89 44 24 28 31 c0 8b 87 c8   RSP: 0018:ffff88811afa3a60 EFLAGS: 00010286   RAX: 000000000000001c RBX: 0000000800000000 RCX: 0000000000000000   RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000800000000   RBP: 0000000800000000 R08: 0000000000000000 R09: c0000000fffff7ff   R10: ffff88811afa38f8 R11: ffff88811afa38f0 R12: ffffffffa02c7ac0   R13: 0000000000000000 R14: ffff88811afa3cd8 R15: ffff88810772fa00   FS:  00007f47b9080740(0000) GS:ffff88852cd40000(0000) knlGS:0000000000000000   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033   CR2: 0000000800000000 CR3: 000000010761e003 CR4: 0000000000370ea0   DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000   DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400   Call Trace:    mlx5_ib_free_odp_mr+0x95/0xc0 [mlx5_ib]    mlx5_ib_dereg_mr+0x128/0x3b0 [mlx5_ib]    ib_dereg_mr_user+0x45/0xb0 [ib_core]    ? xas_load+0x8/0x80    destroy_hw_idr_uobject+0x1a/0x50 [ib_uverbs]    uverbs_destroy_uobject+0x2f/0x150 [ib_uverbs]    uobj_destroy+0x3c/0x70 [ib_uverbs]    ib_uverbs_cmd_verbs+0x467/0xb00 [ib_uverbs]    ? uverbs_finalize_object+0x60/0x60 [ib_uverbs]    ? ttwu_queue_wakelist+0xa9/0xe0    ? pty_write+0x85/0x90    ? file_tty_write.isra.33+0x214/0x330    ? process_echoes+0x60/0x60    ib_uverbs_ioctl+0xa7/0x110 [ib_uverbs]    __x64_sys_ioctl+0x10d/0x8e0    ? vfs_write+0x17f/0x260    do_syscall_64+0x3c/0x80    entry_SYSCALL_64_after_hwframe+0x44/0xae  Add the missing xarray initialization and remove the desc_size set.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.3-1 | [DEBIAN-CVE-2021-47481](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47481.md) | May 22, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.3-1 | [DEBIAN-CVE-2021-47481](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47481.md) | May 22, 2024 |
| Linux | linux Debian 14 | 5.15.3-1 | [DEBIAN-CVE-2021-47481](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47481.md) | May 22, 2024 |

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