In the Linux kernel, the following vulnerability has been resolved:
ppp: associate skb with a device at tx
Syzkaller triggered flow dissector warning with the following:
r0 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000000), 0xc0802, 0x0) ioctl$PPPIOCNEWUNIT(r0, 0xc004743e, &(0x7f00000000c0)) ioctl$PPPIOCSACTIVE(r0, 0x40107446, &(0x7f0000000240)={0x2, &(0x7f0000000180)=[{0x20, 0x0, 0x0, 0xfffff034}, {0x6}]}) pwritev(r0, &(0x7f0000000040)=[{&(0x7f0000000140)='\x00!', 0x2}], 0x1, 0x0, 0x0)
[ 9.485814] WARNING: CPU: 3 PID: 329 at net/core/flow_dissector.c:1016 __skb_flow_dissect+0x1ee0/0x1fa0 [ 9.485929] skb_get_poff+0x53/0xa0 [ 9.485937] bpf_skb_get_pay_offset+0xe/0x20 [ 9.485944] ? ppp_send_frame+0xc2/0x5b0 [ 9.485949] ? _raw_spin_unlock_irqrestore+0x40/0x60 [ 9.485958] ? __ppp_xmit_process+0x7a/0xe0 [ 9.485968] ? ppp_xmit_process+0x5b/0xb0 [ 9.485974] ? ppp_write+0x12a/0x190 [ 9.485981] ? do_iter_write+0x18e/0x2d0 [ 9.485987] ? __import_iovec+0x30/0x130 [ 9.485997] ? do_pwritev+0x1b6/0x240 [ 9.486016] ? trace_hardirqs_on+0x47/0x50 [ 9.486023] ? __x64_sys_pwritev+0x24/0x30 [ 9.486026] ? do_syscall_64+0x3d/0x80 [ 9.486031] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
Flow dissector tries to find skb net namespace either via device or via socket. Neigher is set in ppp_send_frame, so let's manually use ppp->dev.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-tools-develUpgrade kernel-headersUpgrade perf-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-livepatch-5.10.165-143.735Upgrade kernel-toolsUpgrade python-perfUpgrade perfUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade kernelUpgrade bpftool-debuginfoUpgrade bpftoolUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-develUpgrade kernel-livepatch-4.14.304-226.531 | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Dec 10, 2025 | Dec 10, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-toolsUpgrade python3-perfUpgrade kernel-tools-libs | Mar 17, 2026 | Mar 16, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel | Mar 10, 2026 | Mar 10, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 9, 2025 |
| Ubuntu | — | Upgrade linux-riscv-5.15Upgrade linux-gkeopUpgrade linux-gcp-5.4Upgrade linux-nvidia-tegra-5.15Upgrade linux-azure-fde-5.15Upgrade linux-gcpUpgrade linux-azure-fipsUpgrade linux-awsUpgrade linux-azure-5.15Upgrade linux-aws-fipsUpgrade linux-intel-iot-realtimeUpgrade linux-fipsUpgrade linuxUpgrade linux-hweUpgrade linux-hwe-5.4Upgrade linux-gcp-fipsUpgrade linux-intel-iotgUpgrade linux-ibm-5.4Upgrade linux-ibmUpgrade linux-realtimeUpgrade linux-oracle-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-gkeUpgrade linux-oracle-5.4Upgrade linux-lowlatencyUpgrade linux-raspiUpgrade linux-aws-5.4Upgrade linux-aws-hweUpgrade linux-raspi-5.4Upgrade linux-bluefieldUpgrade linux-azure-4.15Upgrade linux-iotUpgrade linux-azureUpgrade linux-gcp-4.15Upgrade linux-oracleUpgrade linux-intel-iotg-5.15Upgrade linux-nvidiaUpgrade linux-xilinx-zynqmpUpgrade linux-aws-5.15Upgrade linux-kvmUpgrade linux-hwe-5.15Upgrade linux-gcp-5.15Upgrade linux-azure-5.4 | Dec 11, 2025 | Dec 9, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Dec 9, 2025 |
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