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CVE PROGRAM SOURCE RECORDUnscored

CVE-2023-52849

cxl/mem: Fix shutdown order

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 9cc238c7a526dba9ee8c210fa2828886fc65db66 to < 20bd0198bebdd706bd4614b3933ef70d7c19618faffected
  • 9cc238c7a526dba9ee8c210fa2828886fc65db66 to < 7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324baffected
  • 9cc238c7a526dba9ee8c210fa2828886fc65db66 to < cad22a757029c3a1985c221a2d4a6491ad4035aeaffected
  • 9cc238c7a526dba9ee8c210fa2828886fc65db66 to < 0ca074f7d788627a4e0b047ca5fbdb5fc567220caffected
  • 9cc238c7a526dba9ee8c210fa2828886fc65db66 to < 88d3917f82ed4215a2154432c26de1480a61b209affected
  • 964a9834492210f48b360baa9e20a9eedf4d08ffaffected
  • 5.14.8 to < 5.15affected

Linux Linux

Default version status: affected

  • 5.15affected
  • 0 to < 5.15unaffected
  • 5.15.139 to ≤ 5.15.*unaffected
  • 6.1.63 to ≤ 6.1.*unaffected
  • 6.5.12 to ≤ 6.5.*unaffected
  • 6.6.2 to ≤ 6.6.*unaffected
  • 6.7 to ≤ *unaffected

References