# CVE-2022-49082: linux: In the Linux kernel, the following vulnerability has been resolved:  scsi: mpt3sas: Fix use after free in _scsih_expa...

CVE-2022-49082 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49082, released February 26, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-49082
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  scsi: mpt3sas: Fix use after free in _scsih_expander_node_remove()  The function mpt3sas_transport_port_remove() called in _scsih_expander_node_remove() frees the port field of the sas_expander structure, leading to the following use-after-free splat from KASAN when the ioc_info() call following that function is executed (e.g. when doing rmmod of the driver module):  [ 3479.371167] ================================================================== [ 3479.378496] BUG: KASAN: use-after-free in _scsih_expander_node_remove+0x710/0x750 [mpt3sas] [ 3479.386936] Read of size 1 at addr ffff8881c037691c by task rmmod/1531 [ 3479.393524] [ 3479.395035] CPU: 18 PID: 1531 Comm: rmmod Not tainted 5.17.0-rc8+ #1436 [ 3479.401712] Hardware name: Supermicro Super Server/H12SSL-NT, BIOS 2.1 06/02/2021 [ 3479.409263] Call Trace: [ 3479.411743]  <TASK> [ 3479.413875]  dump_stack_lvl+0x45/0x59 [ 3479.417582]  print_address_description.constprop.0+0x1f/0x120 [ 3479.423389]  ? _scsih_expander_node_remove+0x710/0x750 [mpt3sas] [ 3479.429469]  kasan_report.cold+0x83/0xdf [ 3479.433438]  ? _scsih_expander_node_remove+0x710/0x750 [mpt3sas] [ 3479.439514]  _scsih_expander_node_remove+0x710/0x750 [mpt3sas] [ 3479.445411]  ? _raw_spin_unlock_irqrestore+0x2d/0x40 [ 3479.452032]  scsih_remove+0x525/0xc90 [mpt3sas] [ 3479.458212]  ? mpt3sas_expander_remove+0x1d0/0x1d0 [mpt3sas] [ 3479.465529]  ? down_write+0xde/0x150 [ 3479.470746]  ? up_write+0x14d/0x460 [ 3479.475840]  ? kernfs_find_ns+0x137/0x310 [ 3479.481438]  pci_device_remove+0x65/0x110 [ 3479.487013]  __device_release_driver+0x316/0x680 [ 3479.493180]  driver_detach+0x1ec/0x2d0 [ 3479.498499]  bus_remove_driver+0xe7/0x2d0 [ 3479.504081]  pci_unregister_driver+0x26/0x250 [ 3479.510033]  _mpt3sas_exit+0x2b/0x6cf [mpt3sas] [ 3479.516144]  __x64_sys_delete_module+0x2fd/0x510 [ 3479.522315]  ? free_module+0xaa0/0xaa0 [ 3479.527593]  ? __cond_resched+0x1c/0x90 [ 3479.532951]  ? lockdep_hardirqs_on_prepare+0x273/0x3e0 [ 3479.539607]  ? syscall_enter_from_user_mode+0x21/0x70 [ 3479.546161]  ? trace_hardirqs_on+0x1c/0x110 [ 3479.551828]  do_syscall_64+0x35/0x80 [ 3479.556884]  entry_SYSCALL_64_after_hwframe+0x44/0xae [ 3479.563402] RIP: 0033:0x7f1fc482483b ... [ 3479.943087] ==================================================================  Fix this by introducing the local variable port_id to store the port ID value before executing mpt3sas_transport_port_remove(). This local variable is then used in the call to ioc_info() instead of dereferencing the freed port structure.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.17.3-1 | [DEBIAN-CVE-2022-49082](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49082.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.17.3-1 | [DEBIAN-CVE-2022-49082](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49082.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.17.3-1 | [DEBIAN-CVE-2022-49082](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49082.md) | Feb 26, 2025 |

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