CVE-2026-98985 (GCVE-0-2026-98985)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:20 – Updated: 2026-10-23 12:20
VLAI
Title
namespace: check the mounts before reading their parents in pivot_root()
Summary
In the Linux kernel, the following vulnerability has been resolved: namespace: check the mounts before reading their parents in pivot_root() path_pivot_root() reads the parents of new_root and of the caller's root and checks whether they are shared before it checks that either mount is in the caller's mount namespace. Only namespace_sem is held. That's fine for a mount that is in the caller's mount namespace. But new_root can be a file descriptor to a mount that has been unmounted and that only the file descriptor keeps alive. If that mount stayed attached to its parent when it was unmounted nothing pins the parent for it. The final mntput() of the parent unhooks the children under mount_lock alone and frees the parent afterwards: pivot_root() close(fd), last ref on the parent ------------ --------------------------------- ex_parent = new_mnt->mnt_parent mntput_no_expire_slowpath() __umount_mnt(new_mnt) cleanup_mnt() call_rcu() IS_MNT_SHARED(ex_parent) BUG: KASAN: slab-use-after-free in path_pivot_root+0xf1a/0x1840 Read of size 4 at addr ffff8881047382f8 by task pivot_widen/157 path_pivot_root+0xf1a/0x1840 __x64_sys_pivot_root+0x165/0x190 The same goes for the caller's root via chroot(). Both outcomes of the check end in EINVAL so nothing but the read itself goes wrong. It's the same thing commit bb4609405752 ("statmount: read the parent of an unmounted mount under mount_lock") fixed for statmount(). Check that both mounts are in the caller's namespace before their parents are read. Every path returns EINVAL either way.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e0c9c0afd2fc958ffa34b697972721d81df8a56f , < a56d4f8f8f4c5d9ac339d5c03a9d90eecd3697fc (git)
Affected: e0c9c0afd2fc958ffa34b697972721d81df8a56f , < 3c2441e21c3df867e4131e0ff784ecdb3a7a55f8 (git)
Affected: e0c9c0afd2fc958ffa34b697972721d81df8a56f , < e3aba6900483f64e6c9eb328150dd633b7d36c1c (git)
Affected: e0c9c0afd2fc958ffa34b697972721d81df8a56f , < 3dad2330c89343ba083cf7868779083fd5fbe0fe (git)
Affected: e0c9c0afd2fc958ffa34b697972721d81df8a56f , < 6b7c001eb5857fa09041f47673666060a2e5fc1c (git)
Affected: 84b78514033ff22c443473214ab6d0508394cf7a (git)
Affected: 4.0.2 , < 4.1 (semver)
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Linux Linux Affected: 4.1
Unaffected: 0 , < 4.1 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.11 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnamespace: check the mounts before reading their parents in pivot_root()\n\npath_pivot_root() reads the parents of new_root and of the caller\u0027s root\nand checks whether they are shared before it checks that either mount is\nin the caller\u0027s mount namespace. Only namespace_sem is held. That\u0027s fine\nfor a mount that is in the caller\u0027s mount namespace.\n\nBut new_root can be a file descriptor to a mount that has been unmounted\nand that only the file descriptor keeps alive. If that mount stayed\nattached to its parent when it was unmounted nothing pins the parent for\nit. The final mntput() of the parent unhooks the children under\nmount_lock alone and frees the parent afterwards:\n\n  pivot_root()                     close(fd), last ref on the parent\n  ------------                     ---------------------------------\n  ex_parent = new_mnt-\u003emnt_parent\n                                   mntput_no_expire_slowpath()\n                                     __umount_mnt(new_mnt)\n                                   cleanup_mnt()\n                                     call_rcu()\n  IS_MNT_SHARED(ex_parent)\n\n  BUG: KASAN: slab-use-after-free in path_pivot_root+0xf1a/0x1840\n  Read of size 4 at addr ffff8881047382f8 by task pivot_widen/157\n   path_pivot_root+0xf1a/0x1840\n   __x64_sys_pivot_root+0x165/0x190\n\nThe same goes for the caller\u0027s root via chroot(). Both outcomes of the\ncheck end in EINVAL so nothing but the read itself goes wrong. It\u0027s the\nsame thing commit bb4609405752 (\"statmount: read the parent of an\nunmounted mount under mount_lock\") fixed for statmount().\n\nCheck that both mounts are in the caller\u0027s namespace before their\nparents are read. Every path returns EINVAL either way."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:20:03.622Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/6b7c001eb5857fa09041f47673666060a2e5fc1c"
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    "cveId": "CVE-2026-98985",
    "datePublished": "2026-10-23T12:20:03.622Z",
    "dateReserved": "2026-09-25T10:25:14.384Z",
    "dateUpdated": "2026-10-23T12:20:03.622Z",
    "state": "PUBLISHED"
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnamespace: check the mounts before reading their parents in pivot_root()\n\npath_pivot_root() reads the parents of new_root and of the caller\u0027s root\nand checks whether they are shared before it checks that either mount is\nin the caller\u0027s mount namespace. Only namespace_sem is held. That\u0027s fine\nfor a mount that is in the caller\u0027s mount namespace.\n\nBut new_root can be a file descriptor to a mount that has been unmounted\nand that only the file descriptor keeps alive. If that mount stayed\nattached to its parent when it was unmounted nothing pins the parent for\nit. The final mntput() of the parent unhooks the children under\nmount_lock alone and frees the parent afterwards:\n\n  pivot_root()                     close(fd), last ref on the parent\n  ------------                     ---------------------------------\n  ex_parent = new_mnt-\u003emnt_parent\n                                   mntput_no_expire_slowpath()\n                                     __umount_mnt(new_mnt)\n                                   cleanup_mnt()\n                                     call_rcu()\n  IS_MNT_SHARED(ex_parent)\n\n  BUG: KASAN: slab-use-after-free in path_pivot_root+0xf1a/0x1840\n  Read of size 4 at addr ffff8881047382f8 by task pivot_widen/157\n   path_pivot_root+0xf1a/0x1840\n   __x64_sys_pivot_root+0x165/0x190\n\nThe same goes for the caller\u0027s root via chroot(). Both outcomes of the\ncheck end in EINVAL so nothing but the read itself goes wrong. It\u0027s the\nsame thing commit bb4609405752 (\"statmount: read the parent of an\nunmounted mount under mount_lock\") fixed for statmount().\n\nCheck that both mounts are in the caller\u0027s namespace before their\nparents are read. Every path returns EINVAL either way."
          }
        ],
        "id": "CVE-2026-98985",
        "lastModified": "2026-10-23T13:17:20.420",
        "metrics": {},
        "published": "2026-10-23T13:17:20.420",
        "references": [
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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