In the Linux kernel, the following vulnerability has been resolved:
cifs: fix oops during encryption
When running xfstests against Azure the following oops occurred on an arm64 system
Unable to handle kernel write to read-only memory at virtual address ffff0001221cf000 Mem abort info: ESR = 0x9600004f EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x0f: level 3 permission fault Data abort info: ISV = 0, ISS = 0x0000004f CM = 0, WnR = 1 swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000294f3000 [ffff0001221cf000] pgd=18000001ffff8003, p4d=18000001ffff8003, pud=18000001ff82e003, pmd=18000001ff71d003, pte=00600001221cf787 Internal error: Oops: 9600004f [#1] PREEMPT SMP ... pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--) pc : __memcpy+0x40/0x230 lr : scatterwalk_copychunks+0xe0/0x200 sp : ffff800014e92de0 x29: ffff800014e92de0 x28: ffff000114f9de80 x27: 0000000000000008 x26: 0000000000000008 x25: ffff800014e92e78 x24: 0000000000000008 x23: 0000000000000001 x22: 0000040000000000 x21: ffff000000000000 x20: 0000000000000001 x19: ffff0001037c4488 x18: 0000000000000014 x17: 235e1c0d6efa9661 x16: a435f9576b6edd6c x15: 0000000000000058 x14: 0000000000000001 x13: 0000000000000008 x12: ffff000114f2e590 x11: ffffffffffffffff x10: 0000040000000000 x9 : ffff8000105c3580 x8 : 2e9413b10000001a x7 : 534b4410fb86b005 x6 : 534b4410fb86b005 x5 : ffff0001221cf008 x4 : ffff0001037c4490 x3 : 0000000000000001 x2 : 0000000000000008 x1 : ffff0001037c4488 x0 : ffff0001221cf000 Call trace: __memcpy+0x40/0x230 scatterwalk_map_and_copy+0x98/0x100 crypto_ccm_encrypt+0x150/0x180 crypto_aead_encrypt+0x2c/0x40 crypt_message+0x750/0x880 smb3_init_transform_rq+0x298/0x340 smb_send_rqst.part.11+0xd8/0x180 smb_send_rqst+0x3c/0x100 compound_send_recv+0x534/0xbc0 smb2_query_info_compound+0x32c/0x440 smb2_set_ea+0x438/0x4c0 cifs_xattr_set+0x5d4/0x7c0
This is because in scatterwalk_copychunks(), we attempted to write to a buffer (@sign) that was allocated in the stack (vmalloc area) by crypt_message() and thus accessing its remaining 8 (x2) bytes ended up crossing a page boundary.
To simply fix it, we could just pass @sign kmalloc'd from crypt_message() and then we're done. Luckily, we don't seem to pass any other vmalloc'd buffers in smb_rqst::rq_iov...
Instead, let's map the correct pages and offsets from vmalloc buffers as well in cifs_sg_set_buf() and then avoiding such oopses.
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 Ami 2 | — | Upgrade python-perfUpgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfoUpgrade kernel-livepatch-5.10.165-143.735Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade bpftoolUpgrade kernel-develUpgrade perfUpgrade kernel-debuginfoUpgrade kernel-tools-develUpgrade kernel-headersUpgrade python-perf-debuginfoUpgrade kernelUpgrade kernel-livepatch-5.15.90-54.138Upgrade kernel-tools-debuginfo | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Sep 18, 2025 | Sep 18, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade kernel | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade bpftoolUpgrade python3-perfUpgrade kernel | Feb 3, 2026 | Jan 30, 2026 |
| Oracle_linux | — | Upgrade kernel | Jan 30, 2026 | Sep 16, 2025 |
| Redhat_linux | — | No solution existsUpgrade kernel | Nov 14, 2025 | Sep 16, 2025 |
| Ubuntu | — | Upgrade linux-gcpUpgrade linux-azure-fipsUpgrade linux-nvidia-tegra-5.15Upgrade linuxUpgrade linux-hwe-5.4Upgrade linux-gcp-fipsUpgrade linux-fipsUpgrade linux-riscv-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-aws-fipsUpgrade linux-gkeopUpgrade linux-intel-iot-realtimeUpgrade linux-oracle-5.4Upgrade linux-gcp-5.4Upgrade linux-ibm-5.4Upgrade linux-raspi-5.4Upgrade linux-azure-5.15Upgrade linux-intel-iotgUpgrade linux-realtimeUpgrade linux-oracle-5.15Upgrade linux-gkeUpgrade linux-lowlatencyUpgrade linux-lowlatency-hwe-5.15Upgrade linux-aws-5.15Upgrade linux-gcp-5.15Upgrade linux-azure-5.4Upgrade linux-azureUpgrade linux-intel-iotg-5.15Upgrade linux-oracleUpgrade linux-aws-5.4Upgrade linux-hwe-5.15Upgrade linux-raspiUpgrade linux-kvmUpgrade linux-ibmUpgrade linux-nvidiaUpgrade linux-iotUpgrade linux-awsUpgrade linux-bluefield | Sep 19, 2025 | Sep 17, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 16, 2025 |
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