THREATINT

We use these services and cookies to improve your user experience. You may opt out if you wish, however, this may limit some features on this site.

Please see our statement on Data Privacy.

Zendesk (Helpdesk and Chat)

Ok

PUBLISHED

CVE-2023-52849

cxl/mem: Fix shutdown order

Reserved:2024-05-21
Published:2024-05-21
Updated:2024-06-10

Description

In the Linux kernel, the following vulnerability has been resolved: cxl/mem: Fix shutdown order Ira reports that removing cxl_mock_mem causes a crash with the following trace: BUG: kernel NULL pointer dereference, address: 0000000000000044 [..] RIP: 0010:cxl_region_decode_reset+0x7f/0x180 [cxl_core] [..] Call Trace: <TASK> cxl_region_detach+0xe8/0x210 [cxl_core] cxl_decoder_kill_region+0x27/0x40 [cxl_core] cxld_unregister+0x29/0x40 [cxl_core] devres_release_all+0xb8/0x110 device_unbind_cleanup+0xe/0x70 device_release_driver_internal+0x1d2/0x210 bus_remove_device+0xd7/0x150 device_del+0x155/0x3e0 device_unregister+0x13/0x60 devm_release_action+0x4d/0x90 ? __pfx_unregister_port+0x10/0x10 [cxl_core] delete_endpoint+0x121/0x130 [cxl_core] devres_release_all+0xb8/0x110 device_unbind_cleanup+0xe/0x70 device_release_driver_internal+0x1d2/0x210 bus_remove_device+0xd7/0x150 device_del+0x155/0x3e0 ? lock_release+0x142/0x290 cdev_device_del+0x15/0x50 cxl_memdev_unregister+0x54/0x70 [cxl_core] This crash is due to the clearing out the cxl_memdev's driver context (@cxlds) before the subsystem is done with it. This is ultimately due to the region(s), that this memdev is a member, being torn down and expecting to be able to de-reference @cxlds, like here: static int cxl_region_decode_reset(struct cxl_region *cxlr, int count) ... if (cxlds->rcd) goto endpoint_reset; ... Fix it by keeping the driver context valid until memdev-device unregistration, and subsequently the entire stack of related dependencies, unwinds.

Product status

Default status
unaffected

9cc238c7a526 before 20bd0198bebd
affected

9cc238c7a526 before 7c7371b41a14
affected

9cc238c7a526 before cad22a757029
affected

9cc238c7a526 before 0ca074f7d788
affected

9cc238c7a526 before 88d3917f82ed
affected

Default status
affected

5.15
affected

Any version before 5.15
unaffected

5.15.139
unaffected

6.1.63
unaffected

6.5.12
unaffected

6.6.2
unaffected

6.7
unaffected

References

https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f

https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b

https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae

https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c

https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209

cve.org CVE-2023-52849

nvd.nist.gov CVE-2023-52849

Download JSON

Share this page
https://cve.threatint.com/CVE/CVE-2023-52849