In the Linux kernel, the following vulnerability has been resolved:
smb: client: require a full NFS mode SID before reading mode bits
parse_dacl() treats an ACE SID matching sid_unix_NFS_mode as an NFS mode SID and reads sid.sub_auth[2] to recover the mode bits.
That assumes the ACE carries three subauthorities, but compare_sids() only compares min(a, b) subauthorities. A malicious server can return an ACE with num_subauth = 2 and sub_auth[] = {88, 3}, which still matches sid_unix_NFS_mode and then drives the sub_auth[2] read four bytes past the end of the ACE.
Require num_subauth >= 3 before treating the ACE as an NFS mode SID. This keeps the fix local to the special-SID mode path without changing compare_sids() semantics for the rest of cifsacl.
CVSS Details
- CVSS 3.1 Base Score: 7.6
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfoUpgrade kernel-livepatch-5.15.210-148.245Upgrade bpftoolUpgrade kernel-tools-debuginfoUpgrade kernelUpgrade perfUpgrade kernel-livepatch-5.10.259-258.1043Upgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-develUpgrade kernel-tools-develUpgrade perf-debuginfoUpgrade kernel-headersUpgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade python-perfUpgrade kernel-tools | Jul 8, 2026 | Jul 8, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Jul 5, 2026 | Jul 5, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | May 8, 2026 |
| Ubuntu | — | Upgrade linux-image-7.0.0-27-genericUpgrade linux-image-6.8.0-1064-gcp-fipsUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-azure-fips-6.8Upgrade linux-image-azure-6.8Upgrade linux-image-7.0.0-1009-ibmUpgrade linux-image-6.8.0-1059-nvidia-lowlatencyUpgrade linux-image-lowlatency-6.8Upgrade linux-image-generic-6.8Upgrade linux-image-6.8.0-1059-gkeUpgrade linux-image-aws-fipsUpgrade linux-image-7.0.0-28-genericUpgrade linux-image-aws-64k-7.0Upgrade linux-image-7.0.0-28-generic-64kUpgrade linux-image-6.8.0-2050-raspi-realtimeUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gcp-6.8Upgrade linux-image-raspi-7.0Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-generic-7.0Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-aws-fips-6.8Upgrade linux-image-aws-64kUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-virtualUpgrade linux-image-azure-fde-7.0Upgrade linux-image-6.8.0-1064-gcp-64kUpgrade linux-image-7.0.0-1008-awsUpgrade linux-image-gcpUpgrade linux-image-fips-6.8Upgrade linux-image-fipsUpgrade linux-image-6.8.0-136-lowlatencyUpgrade linux-image-oem-24.04bUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-gkeUpgrade linux-image-generic-lpaeUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-azure-fipsUpgrade linux-image-aws-64k-6.8Upgrade linux-image-6.8.1-1056-realtimeUpgrade linux-image-6.8.0-1061-raspiUpgrade linux-image-6.8.0-1030-nvidia-tegraUpgrade linux-image-azure-fde-6.8Upgrade linux-image-7.0.0-1009-azure-fdeUpgrade linux-image-6.8.0-1061-awsUpgrade linux-image-6.8.0-1059-nvidia-64kUpgrade linux-image-realtime-64kUpgrade linux-image-oem-24.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-awsUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-xilinxUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-gkeop-6.8Upgrade linux-image-oem-24.04dUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-7.0.0-1014-raspi-realtimeUpgrade linux-image-raspi-realtimeUpgrade linux-image-oracleUpgrade linux-image-7.0.0-1008-aws-64kUpgrade linux-image-7.0.0-1007-oracleUpgrade linux-image-6.8.0-136-lowlatency-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-virtual-7.0Upgrade linux-image-gcp-7.0Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-realtimeUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-kvmUpgrade linux-image-6.8.0-1033-xilinxUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-oem-20.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-ibm-6.8Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-6.8.0-1059-nvidiaUpgrade linux-image-7.0.0-1013-nvidia-64kUpgrade linux-image-7.0.0-27-realtimeUpgrade linux-image-oracle-6.8Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-aws-lts-24.04Upgrade linux-image-oem-22.04aUpgrade linux-image-oem-22.04dUpgrade linux-image-oem-22.04Upgrade linux-image-6.8.0-1061-aws-64kUpgrade linux-image-nvidia-7.0Upgrade linux-image-generic-64k-7.0Upgrade linux-image-gcp-64kUpgrade linux-image-7.0.0-1007-gcpUpgrade linux-image-gcp-fips-6.8Upgrade linux-image-generic-64k | Jul 1, 2026 | May 8, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jun 8, 2026 | May 8, 2026 |
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