CVE-2022-50356
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-17

Last updated on: 2025-12-10

Assigner: kernel.org

Description
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>
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Meta Information
Published
2025-09-17
Last Modified
2025-12-10
Generated
2026-05-07
AI Q&A
2025-09-17
EPSS Evaluated
2026-05-05
NVD
CVE-2022-50356
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 2.6.39 (inc) to 5.10.152 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.76 (exc)
linux linux_kernel From 5.16 (inc) to 6.0.6 (exc)
linux linux_kernel 6.1
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is a null pointer dereference issue in the Linux kernel's network scheduler (net: sched: sfb). It occurs when the default queuing discipline (qdisc) is set to sfb, and the initialization of the qdisc for a device queue fails during mqprio_init(). When this failure happens, sfb_reset() is called to clear resources, but it attempts to reset a qdisc pointer that is NULL, leading to a general protection fault (crash) due to accessing invalid memory.


How can this vulnerability impact me? :

This vulnerability can cause a general protection fault (kernel crash) in the Linux system when the sfb qdisc initialization fails. This can lead to system instability or denial of service as the kernel encounters a null pointer dereference and crashes.


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