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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade bpftool6.18-debuginfoUpgrade python3-perf6.18-debuginfoUpgrade perf6.18Upgrade microvm-kernel6.18Upgrade kernel6.18-modules-extraUpgrade kernel6.18-toolsUpgrade bpftool6.18Upgrade python3-perf6.18Upgrade kernel6.18-tools-debuginfoUpgrade perf6.18-debuginfoUpgrade kernel6.18-debuginfoUpgrade kernel6.18-tools-develUpgrade kernel6.18-headersUpgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel6.18-modules-extra-commonUpgrade kernel6.18-develUpgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel-livepatch-6.18.35-68.127Upgrade kernel6.18 | Aug 10, 2026 | Jul 19, 2026 |
| Redhat_linux | — | No solution exists | Aug 10, 2026 | Jul 19, 2026 |
| Ubuntu | — | Upgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-7.0.0-1009-awsUpgrade linux-image-azure-7.0Upgrade linux-image-raspi-realtimeUpgrade linux-image-gcpUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-aws-64kUpgrade linux-image-oracleUpgrade linux-image-azure-fde-7.0Upgrade linux-image-raspi-7.0Upgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-1014-azureUpgrade linux-image-7.0.0-1009-azure-fdeUpgrade linux-image-7.0.0-2016-nvidia-bos-64kUpgrade linux-image-awsUpgrade linux-image-7.0.0-1015-raspi-realtimeUpgrade linux-image-7.0.0-1008-oracle-64kUpgrade linux-image-7.0.0-1016-nvidia-64kUpgrade linux-image-oracle-64kUpgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-7.0.0-2016-nvidia-bosUpgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-7.0.0-1010-ibmUpgrade linux-image-aws-7.0Upgrade linux-image-raspi-realtime-7.0Upgrade linux-image-nvidia-bos-7.0Upgrade linux-image-7.0.0-1008-oracleUpgrade linux-image-oracle-7.0Upgrade linux-image-nvidia-64kUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-raspiUpgrade linux-image-nvidiaUpgrade linux-image-ibm-7.0Upgrade linux-image-7.0.0-1015-raspiUpgrade linux-image-azure-fdeUpgrade linux-image-gcp-64kUpgrade linux-image-azureUpgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-7.0.0-1010-azureUpgrade linux-image-7.0.0-1009-aws-64kUpgrade linux-image-nvidia-bos-64kUpgrade linux-image-nvidia-7.0Upgrade linux-image-ibmUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-7.0.0-1016-nvidiaUpgrade linux-image-nvidia-bosUpgrade linux-image-aws-64k-7.0 | Jul 21, 2026 | Jul 20, 2026 |
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