In the Linux kernel, the following vulnerability has been resolved:
sctp: add a refcnt in sctp_stream_priorities to avoid a nested loop
With this refcnt added in sctp_stream_priorities, we don't need to traverse all streams to check if the prio is used by other streams when freeing one stream's prio in sctp_sched_prio_free_sid(). This can avoid a nested loop (up to 65535 * 65535), which may cause a stuck as Ying reported:
watchdog: BUG: soft lockup - CPU#23 stuck for 26s! [ksoftirqd/23:136] Call Trace: <TASK> sctp_sched_prio_free_sid+0xab/0x100 [sctp] sctp_stream_free_ext+0x64/0xa0 [sctp] sctp_stream_free+0x31/0x50 [sctp] sctp_association_free+0xa5/0x200 [sctp]
Note that it doesn't need to use refcount_t type for this counter, as its accessing is always protected under the sock lock.
v1->v2: - add a check in sctp_sched_prio_set to avoid the possible prio_head refcnt overflow.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-livepatch-5.10.173-154.642Upgrade kernelUpgrade python-perf-debuginfoUpgrade kernel-debuginfoUpgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade kernel-develUpgrade kernel-tools-develUpgrade bpftoolUpgrade kernel-livepatch-5.15.102-61.139Upgrade kernel-debuginfo-common-aarch64Upgrade python-perfUpgrade bpftool-debuginfoUpgrade perf-debuginfoUpgrade perfUpgrade kernel-tools | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-libbpf-staticUpgrade bpftoolUpgrade kernel-tools-develUpgrade kernelUpgrade kernel-libbpf-develUpgrade kernel-livepatch-6.1.19-30.43Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-toolsUpgrade kernel-headersUpgrade kernel-debuginfoUpgrade kernel-libbpfUpgrade perfUpgrade kernel-develUpgrade perf-debuginfoUpgrade python3-perf-debuginfoUpgrade python3-perfUpgrade bpftool-debuginfoUpgrade kernel-tools-debuginfo | Oct 24, 2025 | Oct 4, 2025 |
| Debian | — | Upgrade linux | Oct 6, 2025 | Oct 6, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade kernel-tools-libsUpgrade kernelUpgrade kernel-toolsUpgrade bpftoolUpgrade kernel-abi-stablelists | Feb 3, 2026 | Feb 2, 2026 |
| Ubuntu | — | Upgrade linux-azureUpgrade linux-oracle-5.4Upgrade linux-realtimeUpgrade linux-bluefieldUpgrade linux-azure-fdeUpgrade linux-azure-5.4Upgrade linux-awsUpgrade linux-gcp-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-aws-5.4Upgrade linux-raspiUpgrade linux-raspi-5.4Upgrade linux-intel-iotgUpgrade linux-iotUpgrade linux-fipsUpgrade linux-lowlatency-hwe-5.15Upgrade linux-kvmUpgrade linux-nvidia-tegraUpgrade linux-lowlatencyUpgrade linux-azure-5.15Upgrade linux-oracleUpgrade linux-riscv-5.15Upgrade linux-aws-fipsUpgrade linux-nvidiaUpgrade linux-gcp-fipsUpgrade linux-gcpUpgrade linux-nvidia-tegra-igxUpgrade linuxUpgrade linux-ibmUpgrade linux-ibm-5.15Upgrade linux-oracle-5.15Upgrade linux-gkeopUpgrade linux-intel-iot-realtimeUpgrade linux-xilinx-zynqmpUpgrade linux-gcp-5.4Upgrade linux-azure-fipsUpgrade linux-hwe-5.4Upgrade linux-ibm-5.4Upgrade linux-gkeUpgrade linux-hwe-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-aws-5.15 | Oct 10, 2025 | Oct 4, 2025 |
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