cxl/mem: Fix shutdown order

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.

Scores

EPSS (exploitation in 30 days)

0.24% · top 85% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

• CWE-476 (opens in a new tab)All about CWE-476 and its CVEs

Affected products

• Linux · Linux

  • affected 9cc238c7a526dba9ee8c210fa2828886fc65db66 – < 20bd0198bebdd706bd4614b3933ef70d7c19618f
  • affected 9cc238c7a526dba9ee8c210fa2828886fc65db66 – < 7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b
  • affected 9cc238c7a526dba9ee8c210fa2828886fc65db66 – < cad22a757029c3a1985c221a2d4a6491ad4035ae
  • affected 9cc238c7a526dba9ee8c210fa2828886fc65db66 – < 0ca074f7d788627a4e0b047ca5fbdb5fc567220c
  • affected 9cc238c7a526dba9ee8c210fa2828886fc65db66 – < 88d3917f82ed4215a2154432c26de1480a61b209
  • affected 964a9834492210f48b360baa9e20a9eedf4d08ff
  • affected 5.14.8 – < 5.15

• Linux · Linux

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

References (5)

• https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f (opens in a new tab)x_transferred
• https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b (opens in a new tab)x_transferred
• https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae (opens in a new tab)x_transferred
• https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c (opens in a new tab)x_transferred
• https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209 (opens in a new tab)x_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2023-52849](https://trackcve.app/badge/CVE-2023-52849.svg)](https://trackcve.app/cve/CVE-2023-52849)

Record last updated 23 May 2026, 15:27 UTC.