In the Linux kernel, the following vulnerability has been resolved:
dma-buf/dma-resv: check if the new fence is really later
Previously when we added a fence to a dma_resv object we always assumed the the newer than all the existing fences.
With Jason's work to add an UAPI to explicit export/import that's not necessary the case any more. So without this check we would allow userspace to force the kernel into an use after free error.
Since the change is very small and defensive it's probably a good idea to backport this to stable kernels as well just in case others are using the dma_resv object in the same way.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-tools-develUpgrade kernel-livepatch-4.14.355-280.652Upgrade bpftoolUpgrade kernel-livepatch-5.10.238-234.956Upgrade kernel-livepatch-5.10.238-231.953Upgrade kernel-develUpgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.10.237-230.948Upgrade kernel-livepatch-4.14.355-280.664Upgrade kernel-livepatch-5.10.240-238.955Upgrade kernel-toolsUpgrade kernel-livepatch-4.14.355-280.672Upgrade kernel-livepatch-5.10.239-236.958Upgrade kernel-livepatch-4.14.355-280.651Upgrade kernel-headersUpgrade perf-debuginfoUpgrade kernel-livepatch-5.15.189-131.211Upgrade kernel-debuginfo-common-aarch64Upgrade python-perfUpgrade kernel-tools-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-debuginfoUpgrade kernel-livepatch-4.14.355-277.647Upgrade kernel-livepatch-5.10.237-230.949Upgrade kernel-livepatch-5.10.240-238.966Upgrade bpftool-debuginfoUpgrade perf | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Jun 20, 2025 | Jun 20, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 18, 2025 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | Jun 18, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Feb 9, 2026 | Jun 18, 2025 |
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