CVE-2022-50296

UM: cpuinfo: Fix a warning for CONFIG_CPUMASK_OFFSTACK

MEDIUM

5.5

CVSS Score

Published: September 15, 2025 at 02:45 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: UM: cpuinfo: Fix a warning for CONFIG_CPUMASK_OFFSTACK When CONFIG_CPUMASK_OFFSTACK and CONFIG_DEBUG_PER_CPU_MAPS is selected, cpu_max_bits_warn() generates a runtime warning similar as below while we show /proc/cpuinfo. Fix this by using nr_cpu_ids (the runtime limit) instead of NR_CPUS to iterate CPUs. [ 3.052463] ------------[ cut here ]------------ [ 3.059679] WARNING: CPU: 3 PID: 1 at include/linux/cpumask.h:108 show_cpuinfo+0x5e8/0x5f0 [ 3.070072] Modules linked in: efivarfs autofs4 [ 3.076257] CPU: 0 PID: 1 Comm: systemd Not tainted 5.19-rc5+ #1052 [ 3.099465] Stack : 9000000100157b08 9000000000f18530 9000000000cf846c 9000000100154000 [ 3.109127] 9000000100157a50 0000000000000000 9000000100157a58 9000000000ef7430 [ 3.118774] 90000001001578e8 0000000000000040 0000000000000020 ffffffffffffffff [ 3.128412] 0000000000aaaaaa 1ab25f00eec96a37 900000010021de80 900000000101c890 [ 3.138056] 0000000000000000 0000000000000000 0000000000000000 0000000000aaaaaa [ 3.147711] ffff8000339dc220 0000000000000001 0000000006ab4000 0000000000000000 [ 3.157364] 900000000101c998 0000000000000004 9000000000ef7430 0000000000000000 [ 3.167012] 0000000000000009 000000000000006c 0000000000000000 0000000000000000 [ 3.176641] 9000000000d3de08 9000000001639390 90000000002086d8 00007ffff0080286 [ 3.186260] 00000000000000b0 0000000000000004 0000000000000000 0000000000071c1c [ 3.195868] ... [ 3.199917] Call Trace: [ 3.203941] [<90000000002086d8>] show_stack+0x38/0x14c [ 3.210666] [<9000000000cf846c>] dump_stack_lvl+0x60/0x88 [ 3.217625] [<900000000023d268>] __warn+0xd0/0x100 [ 3.223958] [<9000000000cf3c90>] warn_slowpath_fmt+0x7c/0xcc [ 3.231150] [<9000000000210220>] show_cpuinfo+0x5e8/0x5f0 [ 3.238080] [<90000000004f578c>] seq_read_iter+0x354/0x4b4 [ 3.245098] [<90000000004c2e90>] new_sync_read+0x17c/0x1c4 [ 3.252114] [<90000000004c5174>] vfs_read+0x138/0x1d0 [ 3.258694] [<90000000004c55f8>] ksys_read+0x70/0x100 [ 3.265265] [<9000000000cfde9c>] do_syscall+0x7c/0x94 [ 3.271820] [<9000000000202fe4>] handle_syscall+0xc4/0x160 [ 3.281824] ---[ end trace 8b484262b4b8c24c ]---

Affected

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

Linux Kernel · Linux

95%

v < 4.9.3312.6.12 ≤ v < 4.14.2962.6.12 ≤ v < 4.19.2622.6.12 ≤ v < 4.9.3312.6.12 ≤ v < 5.10.1502.6.12 ≤ v < 5.15.752.6.12 ≤ v < 5.19.172.6.12 ≤ v < 5.4.2202.6.12 ≤ v < 6.0.32.6.12 ≤ v < 6.14.10 ≤ v < 4.14.2964.15 ≤ v < 4.19.2624.20 ≤ v < 5.4.2205.11 ≤ v < 5.15.755.16 ≤ v < 5.19.175.5 ≤ v < 5.10.1506.0 ≤ v < 6.0.31da177e4c3f41524e886b7f1b8a0c1fc7321cac2 2.6.12

Vendor states this is fixed in 16c546e148fa6d14a019431436a6f7b4087dbccd (fixed)

Vendor states this is fixed in 2e3863cc02c156b51b50592d43ffa6a13b680b0d (fixed)

Vendor states this is fixed in 5177bdc38eaa1c1ca6302214ab06913540cd00a2 (fixed)

Vendor states this is fixed in 6a73e6edcbf3cdd82796dcdf0c0f5fe5d91021af (fixed)

Vendor states this is fixed in 7efe61dc6aa45aab8a40e304fa2dae21e33b0db4 (fixed)

Vendor states this is fixed in 844748412be03a236dcf4a208b588162a275e189 (fixed)

Vendor states this is fixed in 8f96aa67c2ccbd7e41b8dc992b8d13cfe206d571 (fixed)

Vendor states this is fixed in cd251d39b13485eb94ee65bb000d024e02c00e45 (fixed)

Vendor states this is fixed in dbd964a733db015bbb9dff592c259c736398140f (fixed)

Vendor states this is fixed in 2.6.12 (unaffected)

Vendor states this is fixed in 4.14.296 (unaffected)

Vendor states this is fixed in 4.19.262 (unaffected)