CVE-2022-50452

net: sched: cake: fix null pointer access issue when cake_init() fails

MEDIUM

5.5

CVSS Score

Published: October 1, 2025 at 11:45 AM UTC

Updated: June 17, 2026 at 05:23 AM UTC

1 product affected across 1 vendorLinux Kernel

Using Linux by Linux?

Get instant alerts when new vulnerabilities affect Linux - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

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>

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

4.19 ≤ v < 4.19.2644.19 ≤ v < 5.10.1524.19 ≤ v < 5.15.764.19 ≤ v < 5.4.2214.19 ≤ v < 6.0.64.19 ≤ v < 6.14.20 ≤ v < 5.4.2215.11 ≤ v < 5.15.765.16 ≤ v < 6.0.65.5 ≤ v < 5.10.1524.1946f6fd5daefac7f5abdafb436b30f63bc7c602b6.1 rc1

Vendor states this is fixed in 154f4c06d9dbec1a14e91286c70b6305810302e0 (fixed)

Vendor states this is fixed in 1dc0a019550fd38ec6cab2d73c90df2bd659c96b (fixed)

Vendor states this is fixed in 51f9a8921ceacd7bf0d3f47fa867a64988ba1dcb (fixed)

Vendor states this is fixed in 86aa1390898146f1de277bb6d2a8ed7fc7a43f12 (fixed)

Vendor states this is fixed in ae48bee2830bf216800e1447baca39541e27a12e (fixed)

Vendor states this is fixed in bc8301ea7e7f1bb9d2ba2fcdf7b5ec2f0792b47e (fixed)

Vendor states this is fixed in 4.19 (unaffected)

Vendor states this is fixed in 4.19.264 (unaffected)

Vendor states this is fixed in 5.10.152 (unaffected)

Vendor states this is fixed in 5.15.76 (unaffected)

Vendor states this is fixed in 5.4.221 (unaffected)

Vendor states this is fixed in 6.0.6 (unaffected)