In the Linux kernel, the following vulnerability has been resolved:
bpf: consider that tail calls invalidate packet pointers
Tail-called programs could execute any of the helpers that invalidate packet pointers. Hence, conservatively assume that each tail call invalidates packet pointers.
Making the change in bpf_helper_changes_pkt_data() automatically makes use of check_cfg() logic that computes 'changes_pkt_data' effect for global sub-programs, such that the following program could be rejected:
int tail_call(struct __sk_buff *sk) { bpf_tail_call_static(sk, &jmp_table, 0); return 0; }
SEC("tc") int not_safe(struct __sk_buff *sk) { int *p = (void *)(long)sk->data; ... make p valid ... tail_call(sk); *p = 42; /* this is unsafe */ ... }
The tc_bpf2bpf.c:subprog_tc() needs change: mark it as a function that can invalidate packet pointers. Otherwise, it can't be freplaced with tailcall_freplace.c:entry_freplace() that does a tail call.
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 |
|---|---|---|---|---|
| Debian | — | Upgrade linuxNo solution exists | May 15, 2025 | May 5, 2025 |
| Huawei Euleros 2_0_sp11 | — | Upgrade python3-perfUpgrade kernelUpgrade bpftoolUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libs | Aug 13, 2025 | Aug 9, 2025 |
| Huawei Euleros 2_0_sp12 | — | Upgrade python3-perfUpgrade bpftoolUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade kernel | Nov 12, 2025 | Aug 9, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernelUpgrade bpftoolUpgrade python3-perfUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libs | Oct 24, 2025 | Aug 9, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 5, 2025 |
| Ubuntu | — | Upgrade linux-image-aws-lts-24.04Upgrade linux-image-6.8.0-1028-raspiUpgrade linux-image-6.8.0-1012-gkeopUpgrade linux-image-6.8.0-1026-ibmUpgrade linux-image-gkeUpgrade linux-image-kvmUpgrade linux-image-awsUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-6.8.0-1028-nvidia-lowlatencyUpgrade linux-image-6.8.0-60-generic-64kUpgrade linux-image-raspi-realtimeUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-6.8.0-1029-azure-fdeUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-oem-22.04dUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-oracleUpgrade linux-image-6.8.0-1029-azureUpgrade linux-image-6.8.0-1028-nvidia-lowlatency-64kUpgrade linux-image-oem-24.04Upgrade linux-image-6.8.0-60-lowlatency-64kUpgrade linux-image-realtimeUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-nvidia-6.8Upgrade linux-image-gcpUpgrade linux-image-6.8.0-2023-raspi-realtimeUpgrade linux-image-6.8.0-1030-gcpUpgrade linux-image-virtualUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.8.0-1030-gcp-64kUpgrade linux-image-gcp-64kUpgrade linux-image-6.8.0-1028-nvidiaUpgrade linux-image-genericUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-6.8.0-1025-gkeUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-oracle-64kUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-azure-nvidiaUpgrade linux-image-oem-22.04Upgrade linux-image-oem-22.04cUpgrade linux-image-gkeop-6.8Upgrade linux-image-azure-lts-24.04Upgrade linux-image-6.8.0-1029-awsUpgrade linux-image-6.8.0-1028-oemUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-6.8.1-1022-realtimeUpgrade linux-image-generic-lpaeUpgrade linux-image-ibmUpgrade linux-image-oem-22.04bUpgrade linux-image-generic-64kUpgrade linux-image-6.8.0-60-genericUpgrade linux-image-gkeopUpgrade linux-image-oem-22.04aUpgrade linux-image-nvidia-64kUpgrade linux-image-azureUpgrade linux-image-nvidiaUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-60-lowlatencyUpgrade linux-image-6.8.0-1026-oracle-64kUpgrade linux-image-lowlatencyUpgrade linux-image-6.8.0-1028-nvidia-64kUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-1016-azure-nvidiaUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-ibm-classicUpgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-oem-24.04aUpgrade linux-image-raspiUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-6.8.0-1026-oracle | May 8, 2025 | May 5, 2025 |
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