In the Linux kernel, the following vulnerability has been resolved:
net: shaper: rework the VALID marking (again)
Recent commit changed the semantics from NOT_VALID to VALID. I didn't realize that the flags are not stored atomically with the entry in XArray. There's still a race of reader observing a VALID mark for a slot, getting interrupted, writer replacing the entry with a different one, reader continuing, fetching the entry which is now a different pointer than the pointer for which VALID was meant.
The biggest consequence of this is that we may see a UAF since net_shaper_rollback() assumed that entries without VALID can be freed without observing RCU.
Looks like the XArray marks are buying us nothing at this point. Let's convert the code to an explicit valid field. The smp_load_acquire() / smp_store_release() barriers are marginally cleaner.
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_2023 | — | Upgrade microvm-kernel6.18Upgrade kernel6.18-debuginfoUpgrade perf6.18Upgrade bpftool6.18-debuginfoUpgrade perf6.18-debuginfoUpgrade kernel6.18-modules-extraUpgrade python3-perf6.18Upgrade kernel6.18-toolsUpgrade kernel6.18-tools-debuginfoUpgrade bpftool6.18Upgrade python3-perf6.18-debuginfoUpgrade kernel-livepatch-6.18.35-68.127Upgrade kernel6.18-headersUpgrade kernel6.18-develUpgrade kernel6.18-tools-develUpgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel6.18Upgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.18-modules-extra-common | Aug 10, 2026 | Jul 19, 2026 |
| Redhat_linux | — | No solution exists | Aug 10, 2026 | Jul 19, 2026 |
| Ubuntu | — | Upgrade linux-image-7.0.0-1015-raspiUpgrade linux-image-azure-fdeUpgrade linux-image-7.0.0-1016-nvidiaUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-7.0.0-1010-ibmUpgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-oracle-7.0Upgrade linux-image-7.0.0-1008-oracleUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-nvidia-bosUpgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-azureUpgrade linux-image-ibm-7.0Upgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-oracle-64kUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-aws-7.0Upgrade linux-image-nvidia-bos-7.0Upgrade linux-image-gcp-64kUpgrade linux-image-7.0.0-1010-azureUpgrade linux-image-7.0.0-1016-nvidia-64kUpgrade linux-image-7.0.0-2016-nvidia-bosUpgrade linux-image-nvidia-64kUpgrade linux-image-nvidia-bos-64kUpgrade linux-image-nvidia-7.0Upgrade linux-image-ibmUpgrade linux-image-aws-64k-7.0Upgrade linux-image-7.0.0-1009-aws-64kUpgrade linux-image-nvidiaUpgrade linux-image-raspiUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-7.0.0-1008-oracle-64kUpgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-2016-nvidia-bos-64kUpgrade linux-image-7.0.0-1015-raspi-realtimeUpgrade linux-image-azure-fde-7.0Upgrade linux-image-raspi-7.0Upgrade linux-image-aws-64kUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-oracleUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-gcpUpgrade linux-image-raspi-realtimeUpgrade linux-image-azure-7.0Upgrade linux-image-7.0.0-1009-awsUpgrade linux-image-7.0.0-1009-azure-fdeUpgrade linux-image-aws | Jul 21, 2026 | Jul 20, 2026 |
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