GHSA-MH8G-8MJF-Q9M9
Vulnerability from github – Published: 2025-12-24 12:30 – Updated: 2025-12-24 12:30In 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: __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.
{
"affected": [],
"aliases": [
"CVE-2025-68373"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-12-24T11:16:00Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: avoid repeated calls to del_gendisk\n\nThere is a uaf problem which is found by case 23rdev-lifetime:\n\nOops: general protection fault, probably for non-canonical address 0xdead000000000122\nRIP: 0010:bdi_unregister+0x4b/0x170\nCall Trace:\n \u003cTASK\u003e\n __del_gendisk+0x356/0x3e0\n mddev_unlock+0x351/0x360\n rdev_attr_store+0x217/0x280\n kernfs_fop_write_iter+0x14a/0x210\n vfs_write+0x29e/0x550\n ksys_write+0x74/0xf0\n do_syscall_64+0xbb/0x380\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7ff5250a177e\n\nThe sequence is:\n1. rdev remove path gets reconfig_mutex\n2. rdev remove path release reconfig_mutex in mddev_unlock\n3. md stop calls do_md_stop and sets MD_DELETED\n4. rdev remove path calls del_gendisk because MD_DELETED is set\n5. md stop path release reconfig_mutex and calls del_gendisk again\n\nSo there is a race condition we should resolve. This patch adds a\nflag MD_DO_DELETE to avoid the race condition.",
"id": "GHSA-mh8g-8mjf-q9m9",
"modified": "2025-12-24T12:30:30Z",
"published": "2025-12-24T12:30:30Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68373"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/90e3bb44c0a86e245d8e5c6520206fa113acb1ee"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b4c5cf406062ad44cd178269571530c6435b2f3b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f0fae1debeb9102398ddf2ef69b4f5d395afafed"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.