CVE-2022-50452 Details
Description
In the Linux kernel, the following vulnerability has been resolved: net: sched: cake: fix null pointer access issue when cake_init() fails When the default qdisc is cake, if the qdisc of dev_queue fails to be inited during mqprio_init(), cake_reset() is invoked to clear resources. In this case, the tins is NULL, and it will cause gpf issue. The process is as follows: qdisc_create_dflt() cake_init() q->tins = kvcalloc(...) --->failed, q->tins is NULL ... qdisc_put() ... cake_reset() ... cake_dequeue_one() b = &q->tins[...] --->q->tins is NULL The following is the Call Trace information: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:cake_dequeue_one+0xc9/0x3c0 Call Trace: <TASK> cake_reset+0xb1/0x140 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: 0033:0x7f89e5122d04 </TASK>
A null pointer dereference vulnerability has been identified in the Linux kernel's Cake queueing discipline. This issue arises when the default queuing discipline is set to Cake, and the queuing discipline of the device queue fails to initialize during the 'mqprio_init()' process. As a result, the 'cake_reset()' function is called to clear resources, but since the 'tins' variable is NULL, it leads to a general protection fault. The vulnerability occurs in several versions of the Linux kernel.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been patched. Instructions for upgrading the Linux kernel can be found in the official Linux documentation or through the package management system of the respective Linux distribution.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/154f4c06d9dbec1a14e91286c70b6305810302e0 | kernel.org | Patch |
| https://git.kernel.org/stable/c/1dc0a019550fd38ec6cab2d73c90df2bd659c96b | kernel.org | Patch |
| https://git.kernel.org/stable/c/51f9a8921ceacd7bf0d3f47fa867a64988ba1dcb | kernel.org | Patch |
| https://git.kernel.org/stable/c/86aa1390898146f1de277bb6d2a8ed7fc7a43f12 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ae48bee2830bf216800e1447baca39541e27a12e | kernel.org | Patch |
| https://git.kernel.org/stable/c/bc8301ea7e7f1bb9d2ba2fcdf7b5ec2f0792b47e | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 4.19, < 4.19.264 >= 4.20, < 5.4.221 >= 5.5, < 5.10.152 >= 5.11, < 5.15.76 >= 5.16, < 6.0.6 6.1 rc1 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Jan 16, 2026 | Initial Analysis | [email protected] |
| Oct 1, 2025 | New CVE Received | kernel.org |