CVE-2026-72010
cgroup/cpuset: rebind mm mempolicy to effective_mems, not mems_allowed
In the Linux kernel, the following vulnerability has been resolved: cgroup/cpuset: rebind mm mempolicy to effective_mems, not mems_allowed Creating a child cpuset where cpuset.mems is never set leads to a div/0 when a VMA mempolicy with MPOL_F_RELATIVE_NODES rebinds in response to a CPU hotplug event. Reproduction steps: 1) Create a cgroup w/ cpuset controls (do not set cpuset.mems) 2) Move the task into the child cpuset 3) Create a VMA mempolicy for that task with MPOL_F_RELATIVE_NODES 4) unplug and hotplug a cpu echo 0 > /sys/devices/system/cpu/cpu1/online echo 1 > /sys/devices/system/cpu/cpu1/online 5) mempolicy rebind does a div/0 in mpol_relative_nodemask on the call to __nodes_fold() The cpuset code passes (cs->mems_allowed) which is not guaranteed to have nodes to the rebind routine. Use cs->effective_mems instead, which is guaranteed to have a non-empty nodemask once we reach that code path. [ david: add a comment, slightly rephrase description ]
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ ae1c802382f7af60aa54879fb4f5920a9df1ff48; < b7adeba2a21c98c7b20f18e27e3ead86bdb5e08d (affected, git) ≥ ae1c802382f7af60aa54879fb4f5920a9df1ff48; < fcc8c310539c3cc523419113b227161a96b50550 (affected, git) ≥ ae1c802382f7af60aa54879fb4f5920a9df1ff48; < 4b06449384b9ee5b3372bab60601ba5cd4162086 (affected, git) ≥ ae1c802382f7af60aa54879fb4f5920a9df1ff48; < 02f67c4f88be8e3dbd91951d13cdcc5bcc82e9c7 (affected, git) ≥ ae1c802382f7af60aa54879fb4f5920a9df1ff48; < fc680afc510157f6b137956011c09abc23eb0842 (affected, git) ≥ ae1c802382f7af60aa54879fb4f5920a9df1ff48; < c844b7d9a9586de15dd28c06da5cc7f6ab28787d (affected, git) ≥ ae1c802382f7af60aa54879fb4f5920a9df1ff48; < c17f06d8a085d6be58b544a440ce243f5e441a60 (affected, git) ≥ ae1c802382f7af60aa54879fb4f5920a9df1ff48; < b983c56426383e4a06fa5970c4e33cee879b1482 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
3.17 (affected) ≥ 0; < 3.17 (unaffected, semver) ≥ 5.10.261; ≤ 5.10.* (unaffected, semver) ≥ 5.15.212; ≤ 5.15.* (unaffected, semver) ≥ 6.1.178; ≤ 6.1.* (unaffected, semver) ≥ 6.6.145; ≤ 6.6.* (unaffected, semver) ≥ 6.12.97; ≤ 6.12.* (unaffected, semver) ≥ 6.18.40; ≤ 6.18.* (unaffected, semver) ≥ 7.1.5; ≤ 7.1.* (unaffected, semver) ≥ 7.2; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/b7adeba2a21c98c7b20f18e27e3ead86bdb5e08dCNA: Linux
- https://git.kernel.org/stable/c/fcc8c310539c3cc523419113b227161a96b50550CNA: Linux
- https://git.kernel.org/stable/c/4b06449384b9ee5b3372bab60601ba5cd4162086CNA: Linux
- https://git.kernel.org/stable/c/02f67c4f88be8e3dbd91951d13cdcc5bcc82e9c7CNA: Linux
- https://git.kernel.org/stable/c/fc680afc510157f6b137956011c09abc23eb0842CNA: Linux
- https://git.kernel.org/stable/c/c844b7d9a9586de15dd28c06da5cc7f6ab28787dCNA: Linux
- https://git.kernel.org/stable/c/c17f06d8a085d6be58b544a440ce243f5e441a60CNA: Linux
- https://git.kernel.org/stable/c/b983c56426383e4a06fa5970c4e33cee879b1482CNA: Linux
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