Description
In the Linux kernel, the following vulnerability has been resolved: clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns What we want is to verify there is that clone won't expose something hidden by a mount we wouldn't be able to undo. "Wouldn't be able to undo" may be a result of MNT_LOCKED on a child, but it may also come from lacking admin rights in the userns of the namespace mount belongs to. clone_private_mnt() checks the former, but not the latter. There's a number of rather confusing CAP_SYS_ADMIN checks in various userns during the mount, especially with the new mount API; they serve different purposes and in case of clone_private_mnt() they usually, but not always end up covering the missing check mentioned above.
Product status
427215d85e8d1476da1a86b8d67aceb485eb3631 (git) before 36fecd740de2d542d2091d65d36554ee2bcf9c65
427215d85e8d1476da1a86b8d67aceb485eb3631 (git) before d717325b5ecf2a40daca85c61923e17f32306179
427215d85e8d1476da1a86b8d67aceb485eb3631 (git) before dc6a664089f10eab0fb36b6e4f705022210191d2
427215d85e8d1476da1a86b8d67aceb485eb3631 (git) before e77078e52fbf018ab986efb3c79065ab35025607
427215d85e8d1476da1a86b8d67aceb485eb3631 (git) before 38628ae06e2a37770cd794802a3f1310cf9846e3
427215d85e8d1476da1a86b8d67aceb485eb3631 (git) before c28f922c9dcee0e4876a2c095939d77fe7e15116
c6e8810d25295acb40a7b69ed3962ff181919571 (git)
e3eee87c846dc47f6d8eb6d85e7271f24122a279 (git)
517b875dfbf58f0c6c9e32dc90f5cf42d71a42ce (git)
963d85d630dabe75a3cfde44a006fec3304d07b8 (git)
812f39ed5b0b7f34868736de3055c92c7c4cf459 (git)
6a002d48a66076524f67098132538bef17e8445e (git)
41812f4b84484530057513478c6770590347dc30 (git)
4.4.281 (semver) before 4.5
4.9.280 (semver) before 4.10
4.14.244 (semver) before 4.15
4.19.204 (semver) before 4.20
5.4.141 (semver) before 5.5
5.10.59 (semver) before 5.11
5.13.11 (semver) before 5.14
5.14
Any version before 5.14
5.15.190 (semver)
6.1.147 (semver)
6.6.100 (semver)
6.12.40 (semver)
6.15.3 (semver)
6.16 (original_commit_for_fix)
References
lists.debian.org/debian-lts-announce/2025/10/msg00008.html
cert-portal.siemens.com/productcert/html/ssa-082556.html
git.kernel.org/...c/36fecd740de2d542d2091d65d36554ee2bcf9c65
git.kernel.org/...c/d717325b5ecf2a40daca85c61923e17f32306179
git.kernel.org/...c/dc6a664089f10eab0fb36b6e4f705022210191d2
git.kernel.org/...c/e77078e52fbf018ab986efb3c79065ab35025607
git.kernel.org/...c/38628ae06e2a37770cd794802a3f1310cf9846e3
git.kernel.org/...c/c28f922c9dcee0e4876a2c095939d77fe7e15116