# CVE-2022-48762: linux: In the Linux kernel, the following vulnerability has been resolved:  arm64: extable: fix load_unaligned_zeropad() reg...

CVE-2022-48762 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48762, released June 20, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-48762
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 20, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  arm64: extable: fix load_unaligned_zeropad() reg indices  In ex_handler_load_unaligned_zeropad() we erroneously extract the data and addr register indices from ex->type rather than ex->data. As ex->type will contain EX_TYPE_LOAD_UNALIGNED_ZEROPAD (i.e. 4):  * We'll always treat X0 as the address register, since EX_DATA_REG_ADDR is    extracted from bits [9:5]. Thus, we may attempt to dereference an    arbitrary address as X0 may hold an arbitrary value.  * We'll always treat X4 as the data register, since EX_DATA_REG_DATA is    extracted from bits [4:0]. Thus we will corrupt X4 and cause arbitrary    behaviour within load_unaligned_zeropad() and its caller.  Fix this by extracting both values from ex->data as originally intended.  On an MTE-enabled QEMU image we are hitting the following crash:  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000  Call trace:   fixup_exception+0xc4/0x108   __do_kernel_fault+0x3c/0x268   do_tag_check_fault+0x3c/0x104   do_mem_abort+0x44/0xf4   el1_abort+0x40/0x64   el1h_64_sync_handler+0x60/0xa0   el1h_64_sync+0x7c/0x80   link_path_walk+0x150/0x344   path_openat+0xa0/0x7dc   do_filp_open+0xb8/0x168   do_sys_openat2+0x88/0x17c   __arm64_sys_openat+0x74/0xa0   invoke_syscall+0x48/0x148   el0_svc_common+0xb8/0xf8   do_el0_svc+0x28/0x88   el0_svc+0x24/0x84   el0t_64_sync_handler+0x88/0xec   el0t_64_sync+0x1b4/0x1b8  Code: f8695a69 71007d1f 540000e0 927df12a (f940014a)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.7-1 | [DEBIAN-CVE-2022-48762](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48762.md) | Jun 20, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.16.7-1 | [DEBIAN-CVE-2022-48762](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48762.md) | Jun 20, 2024 |
| Linux | linux Debian 14 | 5.16.7-1 | [DEBIAN-CVE-2022-48762](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48762.md) | Jun 20, 2024 |

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