In the Linux kernel, the following vulnerability has been resolved:
memfd: deny writeable mappings when implying SEAL_WRITE
When SEAL_EXEC is added, SEAL_WRITE is implied to make W^X. But the implied seal is set after the check that makes sure the memfd can not have any writable mappings. This means one can use SEAL_EXEC to apply SEAL_WRITE while having writeable mappings.
This breaks the contract that SEAL_WRITE provides and can be used by an attacker to pass a memfd that appears to be write sealed but can still be modified arbitrarily.
Fix this by adding the implied seals before the call for mapping_deny_writable() is done.
CVSS Details
- CVSS 3.1 Base Score: 8.4
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade bpftool6.12Upgrade bpftool6.18-debuginfoUpgrade kernel-livepatch-6.12.94-123.174Upgrade kernel6.12Upgrade perf6.12Upgrade kernel6.12-debuginfo-common-aarch64Upgrade microvm-kernel6.18Upgrade python3-perf6.12-debuginfoUpgrade python3-perf6.18Upgrade kernel6.12-toolsUpgrade perf6.18Upgrade kernel6.12-modules-extraUpgrade kernel6.12-tools-develUpgrade kernel6.12-headersUpgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel-livepatch-6.18.35-68.127Upgrade kernel6.12-debuginfoUpgrade kernel6.12-modules-extra-commonUpgrade python3-perf6.18-debuginfoUpgrade bpftool6.18Upgrade kernel6.18-debuginfoUpgrade kernel6.18-tools-debuginfoUpgrade perf6.18-debuginfoUpgrade kernel6.18-develUpgrade bpftool6.12-debuginfoUpgrade kernel6.18-modules-extraUpgrade kernel6.18-modules-extra-commonUpgrade kernel6.18-headersUpgrade kernel6.12-develUpgrade kernel6.18Upgrade perf6.12-debuginfoUpgrade kernel6.18-tools-develUpgrade kernel6.18-debuginfo-common-aarch64Upgrade python3-perf6.12Upgrade kernel6.18-toolsUpgrade kernel6.12-tools-debuginfoUpgrade kernel6.18-debuginfo-common-x86_64 | Aug 10, 2026 | Jul 19, 2026 |
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Redhat_linux | — | No solution existsUpgrade kernelUpgrade kernel-rt | Jul 23, 2026 | Jul 19, 2026 |
| Rocky_linux | — | Upgrade perfUpgrade kernel-uki-virtUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-toolsUpgrade kernel-debuginfo-common-s390xUpgrade rvUpgrade kernel-debug-modules-extraUpgrade libperfUpgrade kernel-rt-debug-modulesUpgrade kernel-zfcpdumpUpgrade kernel-rt-debug-modules-coreUpgrade kernel-develUpgrade perf-debuginfoUpgrade kernel-debug-modules-coreUpgrade kernel-modules-extraUpgrade kernel-rt-modules-coreUpgrade kernel-rt-debugUpgrade libperf-debuginfoUpgrade kernel-coreUpgrade kernel-rt-debug-modules-extraUpgrade kernel-debug-debuginfoUpgrade kernel-rt-develUpgrade kernel-modulesUpgrade kernel-rt-debuginfoUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-zfcpdump-coreUpgrade kernel-uki-virt-addonsUpgrade kernel-debug-coreUpgrade kernel-devel-matchedUpgrade kernel-rtUpgrade kernel-zfcpdump-modulesUpgrade kernel-rt-modulesUpgrade kernel-rt-debug-develUpgrade kernel-rt-debug-coreUpgrade kernel-debug-modulesUpgrade kernel-zfcpdump-debuginfoUpgrade kernel-modules-coreUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debug-uki-virtUpgrade kernel-rt-debug-debuginfoUpgrade kernel-debugUpgrade kernel-debug-devel-matchedUpgrade kernel-tools-libs-develUpgrade python3-perf-debuginfoUpgrade kernel-zfcpdump-develUpgrade kernel-zfcpdump-modules-extraUpgrade python3-perfUpgrade rtlaUpgrade kernel-rt-modules-extraUpgrade kernelUpgrade kernel-tools-debuginfoUpgrade kernel-tools-libsUpgrade kernel-debug-develUpgrade kernel-rt-coreUpgrade kernel-debuginfo | Aug 24, 2026 | Aug 21, 2026 |
| Ubuntu | — | Upgrade linux-image-gcp-64kUpgrade linux-image-azure-7.0Upgrade linux-image-7.0.0-1014-azureUpgrade linux-image-raspi-7.0Upgrade linux-image-nvidia-bosUpgrade linux-image-awsUpgrade linux-image-gcpUpgrade linux-image-raspi-realtimeUpgrade linux-image-azureUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1035-nvidia-tegraUpgrade linux-image-oracle-64kUpgrade linux-image-raspiUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-nvidia-bos-64kUpgrade linux-image-7.0.0-1016-nvidiaUpgrade linux-image-nvidia-64kUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-7.0.0-1015-raspiUpgrade linux-image-7.0.0-1008-oracleUpgrade linux-image-oracleUpgrade linux-image-7.0.0-1016-nvidia-64kUpgrade linux-image-nvidia-bos-7.0Upgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-aws-64kUpgrade linux-image-7.0.0-2016-nvidia-bosUpgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-azure-fde-7.0Upgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-ibm-7.0Upgrade linux-image-7.0.0-1009-aws-64kUpgrade linux-image-aws-7.0Upgrade linux-image-7.0.0-1015-raspi-realtimeUpgrade linux-image-oracle-7.0Upgrade linux-image-7.0.0-1008-oracle-64kUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-nvidia-7.0Upgrade linux-image-nvidia-tegraUpgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-7.0.0-1010-ibmUpgrade linux-image-6.8.0-1035-nvidia-tegra-rtUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-1010-azureUpgrade linux-image-7.0.0-1009-azure-fdeUpgrade linux-image-ibmUpgrade linux-image-7.0.0-1009-awsUpgrade linux-image-aws-64k-7.0Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-nvidia-64k-7.0Upgrade linux-image-nvidiaUpgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-7.0.0-2016-nvidia-bos-64k | Jul 21, 2026 | Jul 20, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 3, 2026 | Jul 19, 2026 |
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