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Description

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.

PUBLISHED Reserved 2025-12-16 | Published 2025-12-24 | Updated 2025-12-24 | Assigner Linux

Product status

Default status
unaffected

9e59d609763f70a992a8f3808dabcce60f14eb5c (git) before b4c5cf406062ad44cd178269571530c6435b2f3b
affected

9e59d609763f70a992a8f3808dabcce60f14eb5c (git) before f0fae1debeb9102398ddf2ef69b4f5d395afafed
affected

9e59d609763f70a992a8f3808dabcce60f14eb5c (git) before 90e3bb44c0a86e245d8e5c6520206fa113acb1ee
affected

Default status
affected

6.17
affected

Any version before 6.17
unaffected

6.17.13 (semver)
unaffected

6.18.2 (semver)
unaffected

6.19-rc1 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/b4c5cf406062ad44cd178269571530c6435b2f3b

git.kernel.org/...c/f0fae1debeb9102398ddf2ef69b4f5d395afafed

git.kernel.org/...c/90e3bb44c0a86e245d8e5c6520206fa113acb1ee

cve.org (CVE-2025-68373)

nvd.nist.gov (CVE-2025-68373)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.