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CVE-2022-50477

rtc: class: Fix potential memleak in devm_rtc_allocate_device()

MEDIUM
5.5
CVSS Score
Published: October 4, 2025 at 03:16 PM UTC
Updated: June 17, 2026 at 05:23 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%

Description

In the Linux kernel, the following vulnerability has been resolved: rtc: class: Fix potential memleak in devm_rtc_allocate_device() devm_rtc_allocate_device() will alloc a rtc_device first, and then run dev_set_name(). If dev_set_name() failed, the rtc_device will memleak. Move devm_add_action_or_reset() in front of dev_set_name() to prevent memleak. unreferenced object 0xffff888110a53000 (size 2048): comm "python3", pid 470, jiffies 4296078308 (age 58.882s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 08 30 a5 10 81 88 ff ff .........0...... 08 30 a5 10 81 88 ff ff 00 00 00 00 00 00 00 00 .0.............. backtrace: [<000000004aac0364>] kmalloc_trace+0x21/0x110 [<000000000ff02202>] devm_rtc_allocate_device+0xd4/0x400 [<000000001bdf5639>] devm_rtc_device_register+0x1a/0x80 [<00000000351bf81c>] rx4581_probe+0xdd/0x110 [rtc_rx4581] [<00000000f0eba0ae>] spi_probe+0xde/0x130 [<00000000bff89ee8>] really_probe+0x175/0x3f0 [<00000000128e8d84>] __driver_probe_device+0xe6/0x170 [<00000000ee5bf913>] device_driver_attach+0x32/0x80 [<00000000f3f28f92>] bind_store+0x10b/0x1a0 [<000000009ff812d8>] drv_attr_store+0x49/0x70 [<000000008139c323>] sysfs_kf_write+0x8d/0xb0 [<00000000b6146e01>] kernfs_fop_write_iter+0x214/0x2d0 [<00000000ecbe3895>] vfs_write+0x61a/0x7d0 [<00000000aa2196ea>] ksys_write+0xc8/0x190 [<0000000046a600f5>] do_syscall_64+0x37/0x90 [<00000000541a336f>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

Affected

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

Linux Kernel· Linux
95%
5.16 ≤ v < 6.0.165.16 ≤ v < 6.1.25.16 ≤ v < 6.26.1 ≤ v < 6.1.224d23181e43d72ca692a479e70dfe5b0b5dd33f15.16
Vendor states this is fixed in 0bcfc8fd3e596994f527b46730579428b3a4fa5f (fixed)
Vendor states this is fixed in 59457a0f079eae19aaf322b3cc1c8ba66f55c5f3 (fixed)
Vendor states this is fixed in 60da73808298ff2cfa9f165d55eb3d7aa7078601 (fixed)
Vendor states this is fixed in 5.16 (unaffected)
Vendor states this is fixed in 6.0.16 (unaffected)
Vendor states this is fixed in 6.1.2 (unaffected)
Vendor states this is fixed in 6.2 (unaffected)

References (3)

Patch
Source: cverecord
https://git.kernel.org/stable/c/0bcfc8fd3e596994f527b46730579428b3a4fa5f
Patch
Source: cverecord
https://git.kernel.org/stable/c/59457a0f079eae19aaf322b3cc1c8ba66f55c5f3
Patch
Source: cverecord
https://git.kernel.org/stable/c/60da73808298ff2cfa9f165d55eb3d7aa7078601

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-401

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