In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix potential cfid UAF in smb2_query_info_compound
When smb2_query_info_compound() retries, a previously allocated cfid may have been freed in the first attempt. Because cfid wasn't reset on replay, later cleanup could act on a stale pointer, leading to a potential use-after-free.
Reinitialize cfid to NULL under the replay label.
Example trace (trimmed):
refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 11224 at ../lib/refcount.c:28 refcount_warn_saturate+0x9c/0x110 [...] RIP: 0010:refcount_warn_saturate+0x9c/0x110 [...] Call Trace: <TASK> smb2_query_info_compound+0x29c/0x5c0 [cifs f90b72658819bd21c94769b6a652029a07a7172f] ? step_into+0x10d/0x690 ? __legitimize_path+0x28/0x60 smb2_queryfs+0x6a/0xf0 [cifs f90b72658819bd21c94769b6a652029a07a7172f] smb311_queryfs+0x12d/0x140 [cifs f90b72658819bd21c94769b6a652029a07a7172f] ? kmem_cache_alloc+0x18a/0x340 ? getname_flags+0x46/0x1e0 cifs_statfs+0x9f/0x2b0 [cifs f90b72658819bd21c94769b6a652029a07a7172f] statfs_by_dentry+0x67/0x90 vfs_statfs+0x16/0xd0 user_statfs+0x54/0xa0 __do_sys_statfs+0x20/0x50 do_syscall_64+0x58/0x80
CVSS Details
- CVSS 3.1 Base Score: 9.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12-libbpf-debuginfoUpgrade kernel6.12-modules-extraUpgrade bpftool6.12Upgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12Upgrade kernel6.12-libbpf-develUpgrade perf6.12Upgrade kernel6.12-headersUpgrade python3-perf6.12Upgrade perf6.12-debuginfoUpgrade kernel6.12-modules-extra-commonUpgrade kernel6.12-develUpgrade bpftool6.12-debuginfoUpgrade kernel6.12-libbpfUpgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-toolsUpgrade kernel6.12-tools-debuginfoUpgrade kernel6.12-tools-develUpgrade kernel6.12-libbpf-staticUpgrade python3-perf6.12-debuginfoUpgrade kernel-livepatch-6.12.58-82.121Upgrade kernel6.12-debuginfo | Mar 27, 2026 | Dec 8, 2025 |
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Oracle_linux | — | Upgrade kernel-uek | Jan 15, 2026 | Dec 8, 2025 |
| Redhat_linux | — | Upgrade kernelNo solution existsUpgrade kernel-rt | May 20, 2026 | Dec 8, 2025 |
| Ubuntu | — | Upgrade linux-image-virtual-6.8Upgrade linux-image-xilinxUpgrade linux-image-gke-64k-6.8Upgrade linux-image-nvidia-64kUpgrade linux-image-oem-22.04cUpgrade linux-image-6.8.0-1050-aws-fipsUpgrade linux-image-oracle-64k-6.8Upgrade linux-image-gcp-fipsUpgrade linux-image-aws-6.17Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-aws-64k-6.17Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-xilinx-6.8Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-genericUpgrade linux-image-gcp-64kUpgrade linux-image-6.8.0-1049-nvidia-lowlatencyUpgrade linux-image-oracle-6.8Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-6.8.0-1052-azure-fipsUpgrade linux-image-6.8.0-106-fipsUpgrade linux-image-6.17.0-14-genericUpgrade linux-image-kvmUpgrade linux-image-intel-iotgUpgrade linux-image-raspi-6.17Upgrade linux-image-oem-22.04bUpgrade linux-image-6.17.0-1007-oracle-64kUpgrade linux-image-6.8.0-106-genericUpgrade linux-image-aws-lts-24.04Upgrade linux-image-6.17.0-1007-gcpUpgrade linux-image-azureUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-oem-22.04dUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-aws-64k-6.8Upgrade linux-image-fips-6.8Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-gkeopUpgrade linux-image-gke-6.8Upgrade linux-image-azure-6.8Upgrade linux-image-azure-fips-6.8Upgrade linux-image-aws-fips-6.8Upgrade linux-image-gcpUpgrade linux-image-raspi-6.8Upgrade linux-image-6.8.0-106-lowlatency-64kUpgrade linux-image-aws-6.8Upgrade linux-image-generic-64k-6.17Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-raspiUpgrade linux-image-nvidia-6.8Upgrade linux-image-6.8.0-1052-gcp-64kUpgrade linux-image-gke-64kUpgrade linux-image-realtime-6.17Upgrade linux-image-virtual-6.17Upgrade linux-image-realtime-6.8.1Upgrade linux-image-6.8.0-106-lowlatencyUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-generic-64kUpgrade linux-image-oracle-64kUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-6.8.0-1049-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-2040-raspi-realtimeUpgrade linux-image-aws-64kUpgrade linux-image-azure-lts-24.04Upgrade linux-image-6.8.0-1049-nvidiaUpgrade linux-image-awsUpgrade linux-image-raspi-realtimeUpgrade linux-image-gkeop-6.8Upgrade linux-image-ibm-6.8Upgrade linux-image-virtualUpgrade linux-image-generic-64k-6.8Upgrade linux-image-lowlatency-64kUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-6.8.0-1052-gcpUpgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-generic-6.17Upgrade linux-image-azure-fipsUpgrade linux-image-6.8.1-1045-realtimeUpgrade linux-image-6.8.0-1052-gcp-fipsUpgrade linux-image-6.8.0-1050-aws-64kUpgrade linux-image-6.8.0-1035-gkeopUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-oracleUpgrade linux-image-ibmUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-oem-6.17Upgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-6.17.0-1011-oemUpgrade linux-image-6.17.0-1008-raspiUpgrade linux-image-raspi-realtime-6.8Upgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-lowlatencyUpgrade linux-image-6.17.0-1007-gcp-64kUpgrade linux-image-oem-22.04aUpgrade linux-image-oracle-6.17Upgrade linux-image-oem-22.04Upgrade linux-image-6.8.0-1048-gke-64kUpgrade linux-image-6.8.0-1047-oracleUpgrade linux-image-ibm-classicUpgrade linux-image-6.8.0-1029-xilinxUpgrade linux-image-6.17.0-14-generic-64kUpgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-1051-azureUpgrade linux-image-6.17.0-1007-oracleUpgrade linux-image-6.8.0-1048-gkeUpgrade linux-image-generic-6.8Upgrade linux-image-6.17.0-1006-realtimeUpgrade linux-image-nvidiaUpgrade linux-image-6.8.0-1047-oracle-64kUpgrade linux-image-aws-fipsUpgrade linux-image-6.17.0-1007-aws-64kUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-6.8.0-1049-nvidia-64kUpgrade linux-image-fipsUpgrade linux-image-6.17.0-1007-awsUpgrade linux-image-azure-6.17Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-lowlatency-6.8Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-gcp-64k-6.17Upgrade linux-image-6.8.0-106-generic-64kUpgrade linux-image-6.8.0-1050-awsUpgrade linux-image-6.17.0-1008-azureUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-gkeUpgrade linux-image-6.8.0-1050-raspiUpgrade linux-image-gcp-6.8Upgrade linux-image-gcp-6.17Upgrade linux-image-6.8.0-1049-ibmUpgrade linux-image-realtimeUpgrade linux-image-oracle-64k-6.17Upgrade linux-image-nvidia-lowlatency-64k | Feb 13, 2026 | Feb 12, 2026 |
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