Cloudanix VulnDB

CVE-2024-26754

None

CVSS

—

EPSS

0.3%

Published

Apr 3, 2024

CISA due date

—

Cloudanix analysis

Schedule a fix SSVC: Track

A flaw in the Linux kernel's handling of certain network tunnel messages can cause crashes or allow attackers to interfere with the system's core operations.

Exploitation
Local Privilege
Attacker needs
Local User
Complexity
Moderate
Impact
Denial Of Service
Component
OS kernel
Class
Use After Free
Remediation
Upgrade
Effort
Medium
Patch risk
Low

What it actually does

Use-after-free and null pointer dereference in gtp_genl_dump_pdp() caused by registering the generic netlink family before the gtp_net_ops pernet operations structure, allowing invalid memory access during netlink dump operations.

Why it matters to the business

Kernel crashes or unexpected behavior in systems using the GTP module can lead to denial of service, loss of network tunneling functionality, and potential kernel-level code execution in affected Linux environments.

How an attack unfolds

An attacker sends crafted generic netlink messages to trigger gtp_genl_dump_pdp() after improper initialization order of pernet ops and netlink family, resulting in dereference of freed or null memory structures as demonstrated by syzkaller.

How to fix it

Update the Linux kernel to the fixed commit f0ecdfa679189d26aedfe24212d4e69e42c2c861 or later stable versions that ensure gtp_net_ops pernet operations are registered before the generic netlink family.

How to confirm the fix worked

Confirm the presence of the registration order fix in the kernel source or binary, and test that gtp module initialization completes without triggering the general protection fault on netlink dump operations.

Typical attack path

  1. Load or ensure presence of the gtp kernel module
  2. Register generic netlink family without prior pernet operations registration
  3. Issue netlink dump requests targeting GTP PDP contexts
  4. Trigger use-after-free or null dereference in dump handler leading to fault

How to detect it

Review kernel logs for general protection faults or null pointer dereferences in gtp_genl_dump_pdp, and inspect netlink message patterns that precede such crashes.

What your security team should do

  • Apply the kernel patch or upgrade to a fixed version immediately on all affected systems
  • Monitor for kernel oops or general protection faults involving gtp_genl_dump_pdp
  • Disable the gtp module if GTP functionality is not required

The record

In the Linux kernel, the following vulnerability has been resolved: gtp: fix use-after-free and null-ptr-deref in gtp_genl_dump_pdp() The gtp_net_ops pernet operations structure for the subsystem must be registered before registering the generic netlink family. Syzkaller hit 'general protection fault in gtp_genl_dump_pdp' bug: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 PID: 5826 Comm: gtp Not tainted 6.8.0-rc3-std-def-alt1 #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.0-alt1 04/01/2014 RIP: 0010:gtp_genl_dump_pdp+0x1be/0x800 [gtp] Code: c6 89 c6 e8 64 e9 86 df 58 45 85 f6 0f 85 4e 04 00 00 e8 c5 ee 86 df 48 8b 54 24 18 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 de 05 00 00 48 8b 44 24 18 4c 8b 30 4c 39 f0 74 RSP: 0018:ffff888014107220 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88800fcda588 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f1be4eb05c0(0000) GS:ffff88806ce80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1be4e766cf CR3: 000000000c33e000 CR4: 0000000000750ef0 PKRU: 55555554 Call Trace: <TASK> ? show_regs+0x90/0xa0 ? die_addr+0x50/0xd0 ? exc_general_protection+0x148/0x220 ? asm_exc_general_protection+0x22/0x30 ? gtp_genl_dump_pdp+0x1be/0x800 [gtp] ? __alloc_skb+0x1dd/0x350 ? __pfx___alloc_skb+0x10/0x10 genl_dumpit+0x11d/0x230 netlink_dump+0x5b9/0xce0 ? lockdep_hardirqs_on_prepare+0x253/0x430 ? __pfx_netlink_dump+0x10/0x10 ? kasan_save_track+0x10/0x40 ? __kasan_kmalloc+0x9b/0xa0 ? genl_start+0x675/0x970 __netlink_dump_start+0x6fc/0x9f0 genl_family_rcv_msg_dumpit+0x1bb/0x2d0 ? __pfx_genl_family_rcv_msg_dumpit+0x10/0x10 ? genl_op_from_small+0x2a/0x440 ? cap_capable+0x1d0/0x240 ? __pfx_genl_start+0x10/0x10 ? __pfx_genl_dumpit+0x10/0x10 ? __pfx_genl_done+0x10/0x10 ? security_capable+0x9d/0xe0

Affected packages

Ecosystem Package Introduced Fixed
Debian:10 linux 0 4.19.316-1
Debian:10 linux-5.10 0 5.10.216-1~deb10u1
Debian:11 linux 0 5.10.216-1
Debian:12 linux 0 6.1.82-1
Debian:13 linux 0 6.7.7-1
Linux Kernel 4.7.0 4.19.308
SUSE:Linux Enterprise High Availability Extension 12 SP5 kernel-default 0 4.12.14-122.216.1
SUSE:Linux Enterprise High Availability Extension 15 SP5 kernel-default 0 5.14.21-150500.55.62.2
SUSE:Linux Enterprise Live Patching 12 SP5 kernel-default 0 4.12.14-122.216.1
SUSE:Linux Enterprise Live Patching 12 SP5 kgraft-patch-SLE12-SP5_Update_56 0 1-8.3.1
SUSE:Linux Enterprise Live Patching 15 SP5 kernel-default 0 5.14.21-150500.55.62.2
SUSE:Linux Enterprise Live Patching 15 SP5 kernel-livepatch-SLE15-SP5-RT_Update_14 0 1-150500.11.5.1
SUSE:Linux Enterprise Live Patching 15 SP5 kernel-livepatch-SLE15-SP5_Update_13 0 1-150500.11.3.2
SUSE:Linux Enterprise Micro 5.5 kernel-default 0 5.14.21-150500.55.62.2
SUSE:Linux Enterprise Micro 5.5 kernel-default-base 0 5.14.21-150500.55.62.2.150500.6.27.2
SUSE:Linux Enterprise Micro 5.5 kernel-rt 0 5.14.21-150500.13.52.1
SUSE:Linux Enterprise Micro 5.5 kernel-source-rt 0 5.14.21-150500.13.52.1
SUSE:Linux Enterprise Module for Basesystem 15 SP5 kernel-64kb 0 5.14.21-150500.55.62.2
SUSE:Linux Enterprise Module for Basesystem 15 SP5 kernel-default 0 5.14.21-150500.55.62.2
SUSE:Linux Enterprise Module for Basesystem 15 SP5 kernel-default-base 0 5.14.21-150500.55.62.2.150500.6.27.2
SUSE:Linux Enterprise Module for Basesystem 15 SP5 kernel-source 0 5.14.21-150500.55.62.2
SUSE:Linux Enterprise Module for Basesystem 15 SP5 kernel-zfcpdump 0 5.14.21-150500.55.62.2
SUSE:Linux Enterprise Module for Development Tools 15 SP5 kernel-docs 0 5.14.21-150500.55.62.2
SUSE:Linux Enterprise Module for Development Tools 15 SP5 kernel-obs-build 0 5.14.21-150500.55.62.2
SUSE:Linux Enterprise Module for Development Tools 15 SP5 kernel-source 0 5.14.21-150500.55.62.2
SUSE:Linux Enterprise Module for Development Tools 15 SP5 kernel-syms 0 5.14.21-150500.55.62.1
SUSE:Linux Enterprise Module for Legacy 15 SP5 kernel-default 0 5.14.21-150500.55.62.2
SUSE:Linux Enterprise Module for Public Cloud 15 SP5 kernel-azure 0 5.14.21-150500.33.48.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP5 kernel-source-azure 0 5.14.21-150500.33.48.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP5 kernel-syms-azure 0 5.14.21-150500.33.48.1
SUSE:Linux Enterprise Real Time 12 SP5 kernel-rt 0 4.12.14-10.182.1
SUSE:Linux Enterprise Real Time 12 SP5 kernel-rt_debug 0 4.12.14-10.182.1
SUSE:Linux Enterprise Real Time 12 SP5 kernel-source-rt 0 4.12.14-10.182.1
SUSE:Linux Enterprise Real Time 12 SP5 kernel-syms-rt 0 4.12.14-10.182.1
SUSE:Linux Enterprise Server 12 SP5 kernel-azure 0 4.12.14-16.182.1
SUSE:Linux Enterprise Server 12 SP5 kernel-default 0 4.12.14-122.216.1
SUSE:Linux Enterprise Server 12 SP5 kernel-source 0 4.12.14-122.216.1
SUSE:Linux Enterprise Server 12 SP5 kernel-source-azure 0 4.12.14-16.182.1
SUSE:Linux Enterprise Server 12 SP5 kernel-syms 0 4.12.14-122.216.1
SUSE:Linux Enterprise Server 12 SP5 kernel-syms-azure 0 4.12.14-16.182.1
SUSE:Linux Enterprise Server for SAP Applications 12 SP5 kernel-azure 0 4.12.14-16.182.1
SUSE:Linux Enterprise Server for SAP Applications 12 SP5 kernel-default 0 4.12.14-122.216.1
SUSE:Linux Enterprise Server for SAP Applications 12 SP5 kernel-source 0 4.12.14-122.216.1
SUSE:Linux Enterprise Server for SAP Applications 12 SP5 kernel-source-azure 0 4.12.14-16.182.1
SUSE:Linux Enterprise Server for SAP Applications 12 SP5 kernel-syms 0 4.12.14-122.216.1
SUSE:Linux Enterprise Server for SAP Applications 12 SP5 kernel-syms-azure 0 4.12.14-16.182.1
SUSE:Linux Enterprise Software Development Kit 12 SP5 kernel-docs 0 4.12.14-122.216.1
SUSE:Linux Enterprise Software Development Kit 12 SP5 kernel-obs-build 0 4.12.14-122.216.1
SUSE:Linux Enterprise Workstation Extension 12 SP5 kernel-default 0 4.12.14-122.216.1
SUSE:Linux Enterprise Workstation Extension 15 SP5 kernel-default 0 5.14.21-150500.55.62.2
SUSE:Real Time Module 15 SP5 kernel-rt 0 5.14.21-150500.13.52.1
SUSE:Real Time Module 15 SP5 kernel-rt_debug 0 5.14.21-150500.13.52.1
SUSE:Real Time Module 15 SP5 kernel-source-rt 0 5.14.21-150500.13.52.1
SUSE:Real Time Module 15 SP5 kernel-syms-rt 0 5.14.21-150500.13.52.1
Ubuntu:14.04:LTS linux 0 3.11.0-12.19
Ubuntu:14.04:LTS linux-aws 0 4.4.0-1002.2
Ubuntu:14.04:LTS linux-lts-xenial 0 4.4.0-13.29~14.04.1
Ubuntu:16.04:LTS linux 0 4.4.0-2.16
Ubuntu:16.04:LTS linux-aws 0 4.4.0-1001.10
Ubuntu:16.04:LTS linux-hwe-edge 0 No fix
Ubuntu:16.04:LTS linux-kvm 0 4.4.0-1004.9
Ubuntu:18.04:LTS linux-aws-5.0 0 No fix
Ubuntu:18.04:LTS linux-aws-5.3 0 No fix
Ubuntu:18.04:LTS linux-azure 0 No fix
Ubuntu:18.04:LTS linux-azure-5.3 0 No fix
Ubuntu:18.04:LTS linux-azure-edge 0 No fix
Ubuntu:18.04:LTS linux-gcp 0 No fix
Ubuntu:18.04:LTS linux-gcp-5.3 0 No fix
Ubuntu:18.04:LTS linux-gke-4.15 0 No fix
Ubuntu:18.04:LTS linux-gke-5.4 0 No fix
Ubuntu:18.04:LTS linux-gkeop-5.4 0 No fix
Ubuntu:18.04:LTS linux-hwe 0 No fix
Ubuntu:18.04:LTS linux-hwe-edge 0 No fix
Ubuntu:18.04:LTS linux-oem 0 No fix
Ubuntu:18.04:LTS linux-oracle-5.0 0 No fix
Ubuntu:18.04:LTS linux-oracle-5.3 0 No fix
Ubuntu:20.04:LTS linux 0 5.4.0-186.206
Ubuntu:20.04:LTS linux-aws 0 5.4.0-1126.136
Ubuntu:20.04:LTS linux-aws-5.11 0 No fix
Ubuntu:20.04:LTS linux-aws-5.13 0 No fix
Ubuntu:20.04:LTS linux-aws-5.15 0 5.15.0-1063.69~20.04.1
Ubuntu:20.04:LTS linux-aws-5.8 0 No fix
Ubuntu:20.04:LTS linux-azure 0 5.4.0-1131.138
Ubuntu:20.04:LTS linux-azure-5.11 0 No fix
Ubuntu:20.04:LTS linux-azure-5.13 0 No fix
Ubuntu:20.04:LTS linux-azure-5.15 0 No fix
Ubuntu:20.04:LTS linux-azure-5.15 0 5.15.0-1065.74~20.04.1
Ubuntu:20.04:LTS linux-azure-5.8 0 No fix
Ubuntu:20.04:LTS linux-azure-fde 0 No fix
Ubuntu:20.04:LTS linux-azure-fde-5.15 0 5.15.0-1065.74~20.04.1.1
Ubuntu:20.04:LTS linux-bluefield 0 5.4.0-1086.93
Ubuntu:20.04:LTS linux-gcp 0 5.4.0-1130.139
Ubuntu:20.04:LTS linux-gcp-5.11 0 No fix
Ubuntu:20.04:LTS linux-gcp-5.13 0 No fix
Ubuntu:20.04:LTS linux-gcp-5.15 0 5.15.0-1062.70~20.04.1
Ubuntu:20.04:LTS linux-gcp-5.8 0 No fix
Ubuntu:20.04:LTS linux-gke 0 No fix
Ubuntu:20.04:LTS linux-gke-5.15 0 No fix
Ubuntu:20.04:LTS linux-gkeop 0 5.4.0-1093.97
Ubuntu:20.04:LTS linux-gkeop-5.15 0 5.15.0-1046.53~20.04.1
Ubuntu:20.04:LTS linux-hwe-5.11 0 No fix
Ubuntu:20.04:LTS linux-hwe-5.13 0 No fix
Ubuntu:20.04:LTS linux-hwe-5.15 0 5.15.0-113.123~20.04.1
Ubuntu:20.04:LTS linux-hwe-5.8 0 No fix
Ubuntu:20.04:LTS linux-ibm 0 5.4.0-1073.78
Ubuntu:20.04:LTS linux-ibm-5.15 0 5.15.0-1057.60~20.04.1
Ubuntu:20.04:LTS linux-intel-5.13 0 No fix
Ubuntu:20.04:LTS linux-intel-iotg-5.15 0 5.15.0-1058.64~20.04.1
Ubuntu:20.04:LTS linux-iot 0 5.4.0-1038.39
Ubuntu:20.04:LTS linux-kvm 0 5.4.0-1114.121
Ubuntu:20.04:LTS linux-lowlatency-hwe-5.15 0 5.15.0-110.120~20.04.1
Ubuntu:20.04:LTS linux-nvidia-tegra-5.15 0 5.15.0-1027.27~20.04.1
Ubuntu:20.04:LTS linux-oem-5.10 0 No fix
Ubuntu:20.04:LTS linux-oem-5.13 0 No fix
Ubuntu:20.04:LTS linux-oem-5.14 0 No fix
Ubuntu:20.04:LTS linux-oem-5.6 0 No fix
Ubuntu:20.04:LTS linux-oracle 0 5.4.0-1125.134
Ubuntu:20.04:LTS linux-oracle-5.11 0 No fix
Ubuntu:20.04:LTS linux-oracle-5.13 0 No fix
Ubuntu:20.04:LTS linux-oracle-5.15 0 No fix
Ubuntu:20.04:LTS linux-oracle-5.15 0 5.15.0-1061.67~20.04.1
Ubuntu:20.04:LTS linux-oracle-5.8 0 No fix
Ubuntu:20.04:LTS linux-raspi 0 5.4.0-1110.122
Ubuntu:20.04:LTS linux-raspi2 0 No fix
Ubuntu:20.04:LTS linux-riscv 0 No fix
Ubuntu:20.04:LTS linux-riscv-5.11 0 No fix
Ubuntu:20.04:LTS linux-riscv-5.15 0 5.15.0-1059.63~20.04.1
Ubuntu:20.04:LTS linux-riscv-5.8 0 No fix
Ubuntu:20.04:LTS linux-xilinx-zynqmp 0 5.4.0-1045.49
Ubuntu:22.04:LTS linux 0 5.15.0-112.122
Ubuntu:22.04:LTS linux-allwinner-5.19 0 No fix
Ubuntu:22.04:LTS linux-aws 0 5.15.0-1063.69
Ubuntu:22.04:LTS linux-aws-5.19 0 No fix
Ubuntu:22.04:LTS linux-aws-6.2 0 No fix
Ubuntu:22.04:LTS linux-aws-6.5 0 No fix
Ubuntu:22.04:LTS linux-aws-6.8 0 6.8.0-1009.9~22.04.2
Ubuntu:22.04:LTS linux-azure 0 5.15.0-1066.75
Ubuntu:22.04:LTS linux-azure-5.19 0 No fix
Ubuntu:22.04:LTS linux-azure-6.2 0 No fix
Ubuntu:22.04:LTS linux-azure-6.5 0 No fix
Ubuntu:22.04:LTS linux-azure-6.8 0 6.8.0-1008.8~22.04.1
Ubuntu:22.04:LTS linux-azure-fde 0 5.15.0-1067.76.1
Ubuntu:22.04:LTS linux-azure-fde 0 5.15.0-1065.74.1
Ubuntu:22.04:LTS linux-azure-fde-5.19 0 No fix
Ubuntu:22.04:LTS linux-azure-fde-6.2 0 No fix
Ubuntu:22.04:LTS linux-azure-fde-6.8 0 No fix
Ubuntu:22.04:LTS linux-gcp 0 5.15.0-1062.70
Ubuntu:22.04:LTS linux-gcp-5.19 0 No fix
Ubuntu:22.04:LTS linux-gcp-6.2 0 No fix
Ubuntu:22.04:LTS linux-gcp-6.5 0 No fix
Ubuntu:22.04:LTS linux-gcp-6.8 0 6.8.0-1010.11~22.04.1
Ubuntu:22.04:LTS linux-gke 0 5.15.0-1060.66
Ubuntu:22.04:LTS linux-gkeop 0 5.15.0-1046.53
Ubuntu:22.04:LTS linux-hwe-5.19 0 No fix
Ubuntu:22.04:LTS linux-hwe-6.2 0 No fix
Ubuntu:22.04:LTS linux-hwe-6.5 0 No fix
Ubuntu:22.04:LTS linux-hwe-6.8 0 6.8.0-38.38~22.04.1
Ubuntu:22.04:LTS linux-ibm 0 5.15.0-1056.59
Ubuntu:22.04:LTS linux-intel-iot-realtime 0 No fix
Ubuntu:22.04:LTS linux-intel-iotg 0 5.15.0-1058.64
Ubuntu:22.04:LTS linux-kvm 0 5.15.0-1060.65
Ubuntu:22.04:LTS linux-lowlatency 0 5.15.0-110.120
Ubuntu:22.04:LTS linux-lowlatency-hwe-5.19 0 No fix
Ubuntu:22.04:LTS linux-lowlatency-hwe-6.2 0 No fix
Ubuntu:22.04:LTS linux-lowlatency-hwe-6.5 0 No fix
Ubuntu:22.04:LTS linux-lowlatency-hwe-6.8 0 6.8.0-38.38.1~22.04.2
Ubuntu:22.04:LTS linux-nvidia 0 5.15.0-1058.59
Ubuntu:22.04:LTS linux-nvidia-6.2 0 No fix
Ubuntu:22.04:LTS linux-nvidia-6.5 0 No fix
Ubuntu:22.04:LTS linux-nvidia-6.8 0 6.8.0-1008.8~22.04.1
Ubuntu:22.04:LTS linux-nvidia-tegra 0 5.15.0-1026.26
Ubuntu:22.04:LTS linux-nvidia-tegra-igx 0 5.15.0-1015.15
Ubuntu:22.04:LTS linux-oem-5.17 0 No fix
Ubuntu:22.04:LTS linux-oem-6.0 0 No fix
Ubuntu:22.04:LTS linux-oem-6.1 0 No fix
Ubuntu:22.04:LTS linux-oem-6.5 0 No fix
Ubuntu:22.04:LTS linux-oracle 0 5.15.0-1061.67
Ubuntu:22.04:LTS linux-oracle-6.5 0 No fix
Ubuntu:22.04:LTS linux-oracle-6.8 0 6.8.0-1006.6~22.04.3
Ubuntu:22.04:LTS linux-raspi 0 5.15.0-1058.61
Ubuntu:22.04:LTS linux-realtime 0 No fix
Ubuntu:22.04:LTS linux-riscv 0 No fix
Ubuntu:22.04:LTS linux-riscv-5.19 0 No fix
Ubuntu:22.04:LTS linux-riscv-6.5 0 No fix
Ubuntu:22.04:LTS linux-riscv-6.8 0 6.8.0-38.38.1~22.04.1
Ubuntu:22.04:LTS linux-starfive-5.19 0 No fix
Ubuntu:22.04:LTS linux-starfive-6.2 0 No fix
Ubuntu:22.04:LTS linux-starfive-6.5 0 No fix
Ubuntu:22.04:LTS linux-xilinx-zynqmp 0 5.15.0-1030.34
Ubuntu:22.04:LTS:for:NVIDIA:BlueField linux-bluefield 0 No fix
Ubuntu:24.04:LTS linux 0 6.8.0-20.20
Ubuntu:24.04:LTS linux-aws 0 6.8.0-1006.6
Ubuntu:24.04:LTS linux-azure 0 6.8.0-1005.5
Ubuntu:24.04:LTS linux-azure-fde 0 No fix
Ubuntu:24.04:LTS linux-gcp 0 6.8.0-1005.5
Ubuntu:24.04:LTS linux-gke 0 6.8.0-1003.5
Ubuntu:24.04:LTS linux-gkeop 0 6.8.0-1001.3
Ubuntu:24.04:LTS linux-ibm 0 6.8.0-1003.3
Ubuntu:24.04:LTS linux-lowlatency 0 6.8.0-25.25.3
Ubuntu:24.04:LTS linux-nvidia 0 6.8.0-1007.7

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