Linux
CVE-2025-68373
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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:
- rdev remove path gets reconfig_mutex
- rdev remove path release reconfig_mutex in mddev_unlock
- md stop calls do_md_stop and sets MD_DELETED
- rdev remove path calls del_gendisk because MD_DELETED is set
- 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.
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Attack Technique
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