In the Linux kernel, the following vulnerability has been resolved:
md: avoid repeated calls to del_gendisk
There is a uaf problem which is found by case 23rdev-lifetime:
Oops: general protection fault, probably for non-canonical address 0xdead000000000122 RIP: 0010:bdi_unregister+0x4b/0x170 Call Trace: <TASK> __del_gendisk+0x356/0x3e0 mddev_unlock+0x351/0x360 rdev_attr_store+0x217/0x280 kernfs_fop_write_iter+0x14a/0x210 vfs_write+0x29e/0x550 ksys_write+0x74/0xf0 do_syscall_64+0xbb/0x380 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff5250a177e
The sequence is: 1. rdev remove path gets reconfig_mutex 2. rdev remove path release reconfig_mutex in mddev_unlock 3. md stop calls do_md_stop and sets MD_DELETED 4. rdev remove path calls del_gendisk because MD_DELETED is set 5. md stop path release reconfig_mutex and calls del_gendisk again
So there is a race condition we should resolve. This patch adds a flag MD_DO_DELETE to avoid the race condition.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 24, 2025 |
| Ubuntu | — | Upgrade linux-image-generic-6.17Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-raspi-6.17Upgrade linux-image-oem-24.04dUpgrade linux-image-6.17.0-1009-oracleUpgrade linux-image-gcpUpgrade linux-image-6.17.0-1010-azureUpgrade linux-image-oracle-64kUpgrade linux-image-aws-6.17Upgrade linux-image-azure-6.17Upgrade linux-image-aws-64kUpgrade linux-image-6.17.0-1009-aws-64kUpgrade linux-image-virtual-6.17Upgrade linux-image-oem-24.04aUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-azureUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oem-24.04Upgrade linux-image-genericUpgrade linux-image-generic-64kUpgrade linux-image-virtualUpgrade linux-image-6.17.0-1009-awsUpgrade linux-image-realtime-6.17Upgrade linux-image-gcp-6.17Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gcp-64kUpgrade linux-image-6.17.0-1009-oracle-64kUpgrade linux-image-6.17.0-1008-realtimeUpgrade linux-image-6.17.0-19-generic-64kUpgrade linux-image-6.17.0-1010-raspiUpgrade linux-image-oracle-64k-6.17Upgrade linux-image-6.17.0-1017-oemUpgrade linux-image-gcp-64k-6.17Upgrade linux-image-aws-64k-6.17Upgrade linux-image-6.17.0-19-genericUpgrade linux-image-generic-64k-6.17Upgrade linux-image-oem-6.17Upgrade linux-image-oracle-6.17Upgrade linux-image-oracleUpgrade linux-image-oem-24.04bUpgrade linux-image-realtimeUpgrade linux-image-raspiUpgrade linux-image-6.17.0-1009-gcp-64kUpgrade linux-image-awsUpgrade linux-image-6.17.0-1009-gcpUpgrade linux-image-oem-24.04c | Mar 17, 2026 | Dec 24, 2025 |
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