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 | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | May 21, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 21, 2024 |
| Suse | — | Upgrade kernel-obs-qaUpgrade kernel-devel-rtUpgrade cluster-md-kmp-azureUpgrade kernel-syms-azureUpgrade dtb-lgUpgrade dtb-amazonUpgrade kernel-macrosUpgrade kernel-symsUpgrade kernel-azure-extraUpgrade gfs2-kmp-64kbUpgrade gfs2-kmp-rtUpgrade dtb-exynosUpgrade kernel-64kb-livepatch-develUpgrade kselftests-kmp-defaultUpgrade dtb-appleUpgrade kernel-default-base-rebuildUpgrade kselftests-kmp-64kbUpgrade kernel-debug-livepatch-develUpgrade dtb-apmUpgrade kernel-azure-livepatch-develUpgrade kernel-rt_debugUpgrade reiserfs-kmp-azureUpgrade kernel-azure-develUpgrade kernel-kvmsmall-livepatch-develUpgrade ocfs2-kmp-rtUpgrade kernel-debugUpgrade dtb-qcomUpgrade kernel-kvmsmallUpgrade kernel-default-extraUpgrade kernel-source-azureUpgrade dtb-mediatekUpgrade kernel-syms-rtUpgrade dtb-freescaleUpgrade dtb-socionextUpgrade kernel-zfcpdumpUpgrade kernel-kvmsmall-develUpgrade kernel-rt-develUpgrade kernel-docsUpgrade kernel-64kbUpgrade kernel-64kb-develUpgrade dtb-armUpgrade dtb-amlogicUpgrade kernel-default-develUpgrade cluster-md-kmp-defaultUpgrade kernel-64kb-optionalUpgrade kernel-rtUpgrade kernel-devel-azureUpgrade kernel-rt-livepatch-develUpgrade dlm-kmp-azureUpgrade dtb-hisiliconUpgrade kernel-sourceUpgrade kernel-azure-vdsoUpgrade kernel-rt_debug-vdsoUpgrade dtb-alteraUpgrade kernel-source-rtUpgrade kernel-default-baseUpgrade dlm-kmp-defaultUpgrade kernel-azure-optionalUpgrade dtb-amdUpgrade gfs2-kmp-defaultUpgrade kernel-obs-buildUpgrade kernel-azureUpgrade kernel-source-vanillaUpgrade dtb-marvellUpgrade ocfs2-kmp-defaultUpgrade kselftests-kmp-rtUpgrade kernel-default-livepatchUpgrade kernel-defaultUpgrade ocfs2-kmp-64kbUpgrade dtb-allwinnerUpgrade kernel-rt-vdsoUpgrade reiserfs-kmp-rtUpgrade dtb-xilinxUpgrade dtb-renesasUpgrade reiserfs-kmp-defaultUpgrade kernel-rt-optionalUpgrade kernel-debug-develUpgrade kernel-default-vdsoUpgrade dlm-kmp-rtUpgrade kernel-rt_debug-develUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-kvmsmall-vdsoUpgrade kernel-docs-htmlUpgrade cluster-md-kmp-64kbUpgrade reiserfs-kmp-64kbUpgrade kselftests-kmp-azureUpgrade cluster-md-kmp-rtUpgrade ocfs2-kmp-azureUpgrade kernel-debug-vdsoUpgrade dtb-sprdUpgrade dtb-nvidiaUpgrade kernel-64kb-extraUpgrade kernel-rt-extraUpgrade kernel-default-livepatch-develUpgrade kernel-develUpgrade gfs2-kmp-azureUpgrade dtb-rockchipUpgrade dtb-broadcomUpgrade dtb-caviumUpgrade dlm-kmp-64kbUpgrade kernel-default-optional | Aug 9, 2024 | May 21, 2024 |
| Ubuntu | — | Upgrade linux-azureUpgrade linux-oracleUpgrade linux-nvidia-tegra-igxUpgrade linux-gcp-fipsUpgrade linux-gkeopUpgrade linux-gkeop-5.15Upgrade linux-gcp-5.15Upgrade linux-nvidiaUpgrade linux-xilinx-zynqmpUpgrade linux-nvidia-6.5Upgrade linux-aws-fipsUpgrade linux-ibmUpgrade linux-intel-iotgUpgrade linux-kvmUpgrade linux-intel-iotg-5.15Upgrade linux-oracle-5.15Upgrade linux-hwe-5.15Upgrade linux-realtimeUpgrade linux-azure-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-azure-fdeUpgrade linux-lowlatencyUpgrade linuxUpgrade linux-nvidia-tegraUpgrade linux-aws-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-riscv-5.15Upgrade linux-bluefieldUpgrade linux-gcpUpgrade linux-fipsUpgrade linux-ibm-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-gkeUpgrade linux-awsUpgrade linux-raspi | Nov 19, 2024 | May 21, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 14, 2025 | May 21, 2024 |
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