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High · 8.1 CVE-2023-52434 EUVD-2023-57059GHSA-23gm-fr88-2r8c

smb: client: fix potential OOBs in smb2_parse_contexts()

Published Feb 20, 2024 · Updated Aug 5, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: kernel Package: linux Package: linux Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.15 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.4 Package: linux-aws-5.8 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-fips Package: linux-azure Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.15 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.4 Package: linux-azure-5.8 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.2 Package: linux-azure-fips Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.15 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.4 Package: linux-gcp-5.8 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.15 Package: linux-hwe-5.19 Package: linux-hwe-5.4 Package: linux-hwe-5.8 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-ibm-5.4 Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-iot Package: linux-kvm Package: linux-lowlatency Package: linux-lowlatency-hwe-5.15 Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-nvidia Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-tegra Package: linux-nvidia-tegra-5.15 Package: linux-nvidia-tegra-igx Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.5 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.15 Package: linux-oracle-5.3 Package: linux-oracle-5.4 Package: linux-oracle-5.8 Package: linux-oracle-6.5 Package: linux-raspi Package: linux-raspi-5.4 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.15 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.5 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix potential OOBs in smb2_parse_contexts()

Validate offsets and lengths before dereferencing create contexts in
smb2_parse_contexts().

This fixes following oops when accessing invalid create contexts from
server:

BUG: unable to handle page fault for address: ffff8881178d8cc3
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 4a01067 P4D 4a01067 PUD 0
Oops: 0000 [#1] PREEMPT SMP NOPTI
CPU: 3 PID: 1736 Comm: mount.cifs Not tainted 6.7.0-rc4 #1
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014
RIP: 0010:smb2_parse_contexts+0xa0/0x3a0 [cifs]
Code: f8 10 75 13 48 b8 93 ad 25 50 9c b4 11 e7 49 39 06 0f 84 d2 00
00 00 8b 45 00 85 c0 74 61 41 29 c5 48 01 c5 41 83 fd 0f 76 55 <0f> b7
7d 04 0f b7 45 06 4c 8d 74 3d 00 66 83 f8 04 75 bc ba 04 00
RSP: 0018:ffffc900007939e0 EFLAGS: 00010216
RAX: ffffc90000793c78 RBX: ffff8880180cc000 RCX: ffffc90000793c90
RDX: ffffc90000793cc0 RSI: ffff8880178d8cc0 RDI: ffff8880180cc000
RBP: ffff8881178d8cbf R08: ffffc90000793c22 R09: 0000000000000000
R10: ffff8880180cc000 R11: 0000000000000024 R12: 0000000000000000
R13: 0000000000000020 R14: 0000000000000000 R15: ffffc90000793c22
FS: 00007f873753cbc0(0000) GS:ffff88806bc00000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8881178d8cc3 CR3: 00000000181ca000 CR4: 0000000000750ef0
PKRU: 55555554
Call Trace:
<TASK>
? __die+0x23/0x70
? page_fault_oops+0x181/0x480
? search_module_extables+0x19/0x60
? srso_alias_return_thunk+0x5/0xfbef5
? exc_page_fault+0x1b6/0x1c0
? asm_exc_page_fault+0x26/0x30
? smb2_parse_contexts+0xa0/0x3a0 [cifs]
SMB2_open+0x38d/0x5f0 [cifs]
? smb2_is_path_accessible+0x138/0x260 [cifs]
smb2_is_path_accessible+0x138/0x260 [cifs]
cifs_is_path_remote+0x8d/0x230 [cifs]
cifs_mount+0x7e/0x350 [cifs]
cifs_smb3_do_mount+0x128/0x780 [cifs]
smb3_get_tree+0xd9/0x290 [cifs]
vfs_get_tree+0x2c/0x100
? capable+0x37/0x70
path_mount+0x2d7/0xb80
? srso_alias_return_thunk+0x5/0xfbef5
? _raw_spin_unlock_irqrestore+0x44/0x60
__x64_sys_mount+0x11a/0x150
do_syscall_64+0x47/0xf0
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f8737657b1e

Affected products

VendorProductAffectedFixed
Linux Linux 3.7 5.4.277

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 linux 6.6.8-1 —
Debian 13 linux 6.6.8-1 —
Debian 12 linux 6.1.82-1 —
Debian 11 linux 5.10.216-1 DSA-5681-1
Debian 10 linux-5.10 5.10.216-1~deb10u1 DLA-3842-1
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield 5.15.0-1044.46 —
Ubuntu 24.04 LTS linux-raspi 6.7.0-1001.1 —
Ubuntu 24.04 LTS linux-raspi-realtime No fix yet —
Ubuntu 22.04 LTS linux 5.15.0-112.122 USN-6820-1
Ubuntu 22.04 LTS linux-aws 5.15.0-1063.69 USN-6821-3
Ubuntu 22.04 LTS linux-aws-6.5 6.5.0-1017.17~22.04.2 USN-6724-2
Ubuntu 22.04 LTS linux-azure 5.15.0-1075.84 USN-7123-1, USN-6821-4
Ubuntu 22.04 LTS linux-azure-6.5 6.5.0-1018.19~22.04.2 USN-6724-1
Ubuntu 22.04 LTS linux-azure-fde 5.15.0-1076.85.1 USN-6821-4
Ubuntu 22.04 LTS linux-gcp 5.15.0-1062.70 USN-6820-1
Ubuntu 22.04 LTS linux-gcp-6.5 6.5.0-1017.17~22.04.1 USN-6724-1
Ubuntu 22.04 LTS linux-gke 5.15.0-1060.66 USN-6821-1
Ubuntu 22.04 LTS linux-gkeop 5.15.0-1046.53 USN-6821-2
Ubuntu 22.04 LTS linux-hwe-6.5 6.5.0-27.28~22.04.1 USN-6724-1
Ubuntu 22.04 LTS linux-ibm 5.15.0-1056.59 USN-6821-1
Ubuntu 22.04 LTS linux-intel-iotg 5.15.0-1058.64 USN-6821-1
Ubuntu 22.04 LTS linux-kvm 5.15.0-1060.65 USN-6821-2
Ubuntu 22.04 LTS linux-lowlatency 5.15.0-110.120 USN-6820-1
Ubuntu 22.04 LTS linux-nvidia 5.15.0-1058.59 USN-6820-2
Ubuntu 22.04 LTS linux-nvidia-6.5 6.5.0-1014.14 —
Ubuntu 22.04 LTS linux-nvidia-tegra 5.15.0-1026.26 —
Ubuntu 22.04 LTS linux-nvidia-tegra-igx 5.15.0-1015.15 —
Ubuntu 22.04 LTS linux-oem-6.5 6.5.0-1019.20 USN-6724-1
Ubuntu 22.04 LTS linux-oracle 5.15.0-1061.67 USN-6821-1
Ubuntu 22.04 LTS linux-oracle-6.5 6.5.0-1020.20~22.04.1 USN-6724-1
Ubuntu 22.04 LTS linux-raspi 5.15.0-1058.61 USN-6919-1
Ubuntu 22.04 LTS linux-riscv +21 No fix yet —
Ubuntu 22.04 LTS linux-riscv-6.5 +1 6.5.0-27.28.1~22.04.1 USN-6724-1
Ubuntu 22.04 LTS linux-starfive-6.5 6.5.0-1011.12~22.04.1 USN-6724-1
Ubuntu 22.04 LTS linux-xilinx-zynqmp 5.15.0-1030.34 USN-6820-1
Ubuntu 20.04 LTS linux 5.4.0-192.212 USN-6951-1
Ubuntu 20.04 LTS linux-aws 5.4.0-1130.140 USN-6951-1
Ubuntu 20.04 LTS linux-aws-5.15 5.15.0-1063.69~20.04.1 USN-6821-3
Ubuntu 20.04 LTS linux-azure 5.4.0-1135.142 USN-6951-2
Ubuntu 20.04 LTS linux-azure-5.15 5.15.0-1078.87~20.04.1 USN-7194-1
Ubuntu 20.04 LTS linux-bluefield 5.4.0-1090.97 USN-6951-4
Ubuntu 20.04 LTS linux-gcp 5.4.0-1134.143 USN-6951-1
Ubuntu 20.04 LTS linux-gcp-5.15 5.15.0-1062.70~20.04.1 USN-6820-1
Ubuntu 20.04 LTS linux-gke +26 No fix yet —
Ubuntu 20.04 LTS linux-gkeop 5.4.0-1097.101 USN-6951-1
Ubuntu 20.04 LTS linux-gkeop-5.15 5.15.0-1046.53~20.04.1 USN-6821-2
Ubuntu 20.04 LTS linux-hwe-5.15 5.15.0-113.123~20.04.1 USN-6871-1
Ubuntu 20.04 LTS linux-ibm 5.4.0-1077.82 USN-6951-1
Ubuntu 20.04 LTS linux-ibm-5.15 5.15.0-1057.60~20.04.1 USN-6892-1
Ubuntu 20.04 LTS linux-intel-iotg-5.15 5.15.0-1058.64~20.04.1 USN-6828-1
Ubuntu 20.04 LTS linux-iot 5.4.0-1042.43 USN-6951-1
Ubuntu 20.04 LTS linux-kvm 5.4.0-1118.125 USN-6951-1
Ubuntu 20.04 LTS linux-lowlatency-hwe-5.15 5.15.0-110.120~20.04.1 USN-6820-1
Ubuntu 20.04 LTS linux-nvidia-tegra-5.15 5.15.0-1027.27~20.04.1 —
Ubuntu 20.04 LTS linux-oracle 5.4.0-1129.138 USN-6953-1
Ubuntu 20.04 LTS linux-oracle-5.15 5.15.0-1061.67~20.04.1 —
Ubuntu 20.04 LTS linux-raspi 5.4.0-1114.126 USN-6951-1
Ubuntu 20.04 LTS linux-riscv-5.15 5.15.0-1059.63~20.04.1 —
Ubuntu 20.04 LTS linux-xilinx-zynqmp 5.4.0-1049.53 USN-6951-1
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Show 7 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu Pro Realtime 22.04 LTS linux-intel-iot-realtime 5.15.0-1056.58 —
Ubuntu Pro Realtime 22.04 LTS linux-realtime 5.15.0-1064.72 —
Ubuntu Pro FIPS 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 22.04 LTS linux-aws-fips 5.15.0-1063.69+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-azure-fips 5.15.0-1075.84+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips 5.15.0-111.121+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-gcp-fips 5.15.0-1062.70+fips1 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-aws-fips 5.4.0-1130.140+fips1 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-azure-fips 5.4.0-1135.142+fips1 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-fips 5.4.0-1104.114 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-gcp-fips 5.4.0-1134.143+fips1 —
Ubuntu Pro FIPS-preview 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro 18.04 LTS linux-aws-5.4 5.4.0-1130.140~18.04.1 USN-6951-1
Ubuntu Pro 18.04 LTS linux-azure-5.4 5.4.0-1135.142~18.04.1 USN-6951-3
Ubuntu Pro 18.04 LTS linux-gcp-5.4 5.4.0-1134.143~18.04.1 USN-6951-1
Ubuntu Pro 18.04 LTS linux-hwe-5.4 5.4.0-192.212~18.04.1 USN-6951-1
Ubuntu Pro 18.04 LTS linux-ibm-5.4 5.4.0-1077.82~18.04.1 USN-6951-1
Ubuntu Pro 18.04 LTS linux-oracle-5.4 5.4.0-1129.138~18.04.1 USN-6953-1
Ubuntu Pro 18.04 LTS linux-raspi-5.4 5.4.0-1114.126~18.04.1 USN-6979-1
ReleasePackageFixed inAdvisory
RHEL 9 bpftool 7.3.0-427.13.1.el9_4 RHSA-2024:2394
RHEL 9 rv +64 5.14.0-427.13.1.el9_4 RHSA-2024:2394
RHEL 8 kernel-rt +12 4.18.0-553.rt7.342.el8_10 RHSA-2024:2950
RHEL 8 perf +26 4.18.0-553.el8_10 RHSA-2024:3138
Show 6 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
RHEL 9.2 EUS bpftool 7.0.0-284.75.1.el9_2 RHSA-2024:4823
RHEL 9.2 EUS kernel-rt +14 5.14.0-284.75.1.rt14.360.el9_2 RHSA-2024:4831
RHEL 9.2 EUS perf +48 5.14.0-284.75.1.el9_2 RHSA-2024:4823
RHEL 9.0 E4S kernel-rt +12 5.14.0-70.105.1.rt21.177.el9_0 RHSA-2024:4412
RHEL 9.0 E4S perf +28 5.14.0-70.105.1.el9_0 RHSA-2024:4415
RHEL 8.8 EUS perf +26 4.18.0-477.74.1.el8_8 RHSA-2024:6993
RHEL 8.6 TUS perf +16 4.18.0-372.119.1.el8_6 RHSA-2024:5692
RHEL 8.6 E4S perf +24 4.18.0-372.119.1.el8_6 RHSA-2024:5692
RHEL 8.6 AUS perf +16 4.18.0-372.119.1.el8_6 RHSA-2024:5692

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 9 bpftool 7.3.0-427.13.1.el9_4 ALSA-2024:2394
AlmaLinux 9 rv +60 5.14.0-427.13.1.el9_4 ALSA-2024:2394
AlmaLinux 8 kernel-rt +11 4.18.0-553.rt7.342.el8_10 ALSA-2024:2950
AlmaLinux 8 perf +24 4.18.0-553.el8_10 ALSA-2024:3138

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 8 kernel 4.18.0-553.el8_10 RXSA-2024:3138, RLSA-2024:3138
Rocky Linux 8 kernel-rt 4.18.0-553.rt7.342.el8_10 RLSA-2024:2950
ReleasePackageFixed inAdvisory
SLES 15 SP6 kernel-64kb +3 6.4.0-150600.23.7.3 SUSE-SU-2024:2203-1
SLES 15 SP6 kernel-azure +1 6.4.0-150600.8.5.4 SUSE-SU-2024:2135-1
SLES 15 SP6 kernel-default-base 6.4.0-150600.23.7.3.150600.12.2.7 SUSE-SU-2024:2203-1
SLES 15 SP6 kernel-docs 6.4.0-150600.23.7.4 SUSE-SU-2024:2203-1
SLES 15 SP6 kernel-source 6.4.0-150600.23.7.2 SUSE-SU-2024:2203-1
SLES 15 SP6 kernel-syms 6.4.0-150600.23.7.1 SUSE-SU-2024:2203-1
SLES 15 SP6 kernel-syms-azure 6.4.0-150600.8.5.1 SUSE-SU-2024:2135-1
SLES 12 SP5 kernel-syms +2 4.12.14-122.244.1 SUSE-SU-2025:0236-1
Show 3 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLE Micro 6.0 kernel-default-base 6.4.0-17.1.1.51 SUSE-SU-2025:20008-1
SLE Micro 6.0 kernel-rt +1 6.4.0-9.1 SUSE-SU-2025:20028-1
SLE Micro 6.0 kernel-source +2 6.4.0-18.1 SUSE-SU-2025:20008-1
SLE Live Patching 15 SP6 kernel-default 6.4.0-150600.23.7.3 SUSE-SU-2024:2203-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_1 1-150600.13.3.7 SUSE-SU-2024:2203-1
SLE Live Patching 12 SP5 kernel-default 4.12.14-122.244.1 SUSE-SU-2025:0236-1
SLE Live Patching 12 SP5 kgraft-patch-SLE12-SP5_Update_64 1-8.5.1 SUSE-SU-2025:0236-1
ReleasePackageFixed inAdvisory
openSUSE Leap 15.6 dtb-aarch64 +2 6.4.0-150600.23.7.1 SUSE-SU-2024:2203-1
openSUSE Leap 15.6 kernel-64kb +5 6.4.0-150600.23.7.3 SUSE-SU-2024:2203-1
openSUSE Leap 15.6 kernel-azure +1 6.4.0-150600.8.5.4 SUSE-SU-2024:2135-1
openSUSE Leap 15.6 kernel-default-base 6.4.0-150600.23.7.3.150600.12.2.7 SUSE-SU-2024:2203-1
openSUSE Leap 15.6 kernel-docs 6.4.0-150600.23.7.4 SUSE-SU-2024:2203-1
openSUSE Leap 15.6 kernel-source 6.4.0-150600.23.7.2 SUSE-SU-2024:2203-1
openSUSE Leap 15.6 kernel-syms-azure 6.4.0-150600.8.5.1 SUSE-SU-2024:2135-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 kernel-livepatch-6.1.79-99.164 1.0-0.amzn2023 ALAS2023-2024-549
Amazon Linux 2023 perf +14 6.1.79-99.164.amzn2023 ALAS2023-2024-549

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 2 (CBL-Mariner) kernel 5.15.153.1-1 —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 9 bpftool 7.3.0-427.13.1.el9_4 ELSA-2024-2394
Oracle Linux 9 rv +27 5.14.0-427.13.1.el9_4 ELSA-2024-2394
Oracle Linux 8 perf +19 4.18.0-553.el8_10 ELSA-2024-3138

Advisories 47

References