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In the Linux kernel, the following vulnerability has been resolved:
net: sched: sfb: fix null pointer access issue when sfb_init() fails
When the default qdisc is sfb, if the qdisc of dev_queue fails to be inited during mqprio_init(), sfb_reset() is invoked to clear resources. In this case, the q->qdisc is NULL, and it will cause gpf issue.
The process is as follows: qdisc_create_dflt() sfb_init() tcf_block_get() --->failed, q->qdisc is NULL ... qdisc_put() ... sfb_reset() qdisc_reset(q->qdisc) --->q->qdisc is NULL ops = qdisc->ops
The following is the Call Trace information: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] RIP: 0010:qdisc_reset+0x2b/0x6f0 Call Trace: <TASK> sfb_reset+0x37/0xd0 qdisc_reset+0xed/0x6f0 qdisc_destroy+0x82/0x4c0 qdisc_put+0x9e/0xb0 qdisc_create_dflt+0x2c3/0x4a0 mqprio_init+0xa71/0x1760 qdisc_create+0x3eb/0x1000 tc_modify_qdisc+0x408/0x1720 rtnetlink_rcv_msg+0x38e/0xac0 netlink_rcv_skb+0x12d/0x3a0 netlink_unicast+0x4a2/0x740 netlink_sendmsg+0x826/0xcc0 sock_sendmsg+0xc5/0x100 ____sys_sendmsg+0x583/0x690 ___sys_sendmsg+0xe8/0x160 __sys_sendmsg+0xbf/0x160 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f2164122d04 </TASK>
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-toolsUpgrade kernelUpgrade kernel-livepatch-5.15.79-51.138Upgrade python-perfUpgrade bpftoolUpgrade kernel-develUpgrade kernel-tools-develUpgrade kernel-livepatch-5.10.155-138.670Upgrade perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade python-perf-debuginfoUpgrade perfUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-headersUpgrade kernel-debuginfoUpgrade bpftool-debuginfo | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Sep 19, 2025 | Sep 19, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade python3-perfUpgrade kernelUpgrade bpftoolUpgrade kernel-tools-libs | Feb 3, 2026 | Feb 2, 2026 |
| Oracle_linux | — | Upgrade kernel | Feb 2, 2026 | Sep 17, 2025 |
| Redhat_linux | — | Upgrade kernel-rtNo solution existsUpgrade kernel | Jun 17, 2026 | Sep 17, 2025 |
| Ubuntu | — | Upgrade linux-azureUpgrade linux-intel-iotg-5.15Upgrade linux-gcp-5.15Upgrade linux-ibmUpgrade linux-awsUpgrade linux-bluefieldUpgrade linux-gcpUpgrade linuxUpgrade linux-azure-5.15Upgrade linux-oracleUpgrade linux-gkeopUpgrade linux-gkeUpgrade linux-kvmUpgrade linux-lowlatency-hwe-5.15Upgrade linux-lowlatencyUpgrade linux-hwe-5.15Upgrade linux-raspiUpgrade linux-aws-5.15Upgrade linux-azure-fdeUpgrade linux-nvidiaUpgrade linux-oracle-5.15Upgrade linux-realtimeUpgrade linux-riscv-5.15Upgrade linux-intel-iotg | Sep 26, 2025 | Sep 17, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 17, 2025 |
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