UM: cpuinfo: Fix a warning for CONFIG_CPUMASK_OFFSTACK
Published Sep 15, 2025
5.5
MEDIUMCVSS 3.1
EPSS 0.16%
Description
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 products
-
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version
-
- Version 2.6.12StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<2.6.12
- Version 4.14.296StatusunaffectedConstraints<=4.14.*
- Version 4.19.262StatusunaffectedConstraints<=4.19.*
- Version 4.9.331StatusunaffectedConstraints<=4.9.*
- Version 5.10.150StatusunaffectedConstraints<=5.10.*
- Version 5.15.75StatusunaffectedConstraints<=5.15.*
- Version 5.19.17StatusunaffectedConstraints<=5.19.*
- Version 5.4.220StatusunaffectedConstraints<=5.4.*
- Version 6.0.3StatusunaffectedConstraints<=6.0.*
- Version 6.1StatusunaffectedConstraints<=*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
| ||||||||||||||||||||||||||||||||||||
| Linux | Linux | affected |
|
- < 4.9.331
- ≥ 4.10 · < 4.14.296
- ≥ 4.15 · < 4.19.262
- ≥ 4.20 · < 5.4.220
- ≥ 5.5 · < 5.10.150
- ≥ 5.11 · < 5.15.75
- ≥ 5.16 · < 5.19.17
- ≥ 6.0 · < 6.0.3
No data.
Red Hat Enterprise Linux 10
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise Linux 9
kernel
Not affected
Red Hat Enterprise Linux 9
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
No CWE recorded.
References (15)
- https://access.redhat.com/security/cve/CVE-2022-50296 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2395282 Issue Tracking
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-55559 Advisory
- https://git.kernel.org/stable/c/16c546e148fa6d14a019431436a6f7b4087dbccd Patch
- https://git.kernel.org/stable/c/2e3863cc02c156b51b50592d43ffa6a13b680b0d Patch
- https://git.kernel.org/stable/c/5177bdc38eaa1c1ca6302214ab06913540cd00a2 Patch
- https://git.kernel.org/stable/c/6a73e6edcbf3cdd82796dcdf0c0f5fe5d91021af Patch
- https://git.kernel.org/stable/c/7efe61dc6aa45aab8a40e304fa2dae21e33b0db4 Patch
- https://git.kernel.org/stable/c/844748412be03a236dcf4a208b588162a275e189 Patch
- https://git.kernel.org/stable/c/8f96aa67c2ccbd7e41b8dc992b8d13cfe206d571 Patch
- https://git.kernel.org/stable/c/cd251d39b13485eb94ee65bb000d024e02c00e45 Patch
- https://git.kernel.org/stable/c/dbd964a733db015bbb9dff592c259c736398140f Patch
- https://lore.kernel.org/linux-cve-announce/2025091557-CVE-2022-50296-7d7e@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2022-50296
- https://www.cve.org/CVERecord?id=CVE-2022-50296
Change history (0)
No recorded changes yet.