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NVD / CVE Program· CNA Linux

CVE-2022-50045: powerpc/pci: Fix get_phb_number() locking

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.14% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1d9e75c3d8cdf7c96a94cb77450d4ee070279e6a, 5.10.138, 5.15.63.

Low priority for now. Upgrade to Linux Linux 1d9e75c3d8cdf7c96a94cb77450d4ee070279e6a, 5.10.138, 5.15.63 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: powerpc/pci: Fix get_phb_number() locking The recent change to get_phb_number() causes a DEBUG_ATOMIC_SLEEP warning on some systems: BUG: sleeping function called from invalid context at kernel/locking/mutex.c:580 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper preempt_count: 1, expected: 0 RCU nest depth: 0, expected: 0 1 lock held by swapper/1: #0: c157efb0 (hose_spinlock){+.+.}-{2:2}, at: pcibios_alloc_controller+0x64/0x220 Preemption disabled at: [<00000000>] 0x0 CPU: 0 PID: 1 Comm: swapper Not tainted 5.19.0-yocto-standard+ #1 Call Trace: [d101dc90] [c073b264] dump_stack_lvl+0x50/0x8c (unreliable) [d101dcb0] [c0093b70] __might_resched+0x258/0x2a8 [d101dcd0] [c0d3e634] __mutex_lock+0x6c/0x6ec [d101dd50] [c0a84174] of_alias_get_id+0x50/0xf4 [d101dd80] [c002ec78] pcibios_alloc_controller+0x1b8/0x220 [d101ddd0] [c140c9dc] pmac_pci_init+0x198/0x784 [d101de50] [c140852c] discover_phbs+0x30/0x4c [d101de60] [c0007fd4] do_one_initcall+0x94/0x344 [d101ded0] [c1403b40] kernel_init_freeable+0x1a8/0x22c [d101df10] [c00086e0] kernel_init+0x34/0x160 [d101df30] [c001b334] ret_from_kernel_thread+0x5c/0x64 This is because pcibios_alloc_controller() holds hose_spinlock but of_alias_get_id() takes of_mutex which can sleep. The hose_spinlock protects the phb_bitmap, and also the hose_list, but it doesn't need to be held while get_phb_number() calls the OF routines, because those are only looking up information in the device tree. So fix it by having get_phb_number() take the hose_spinlock itself, only where required, and then dropping the lock before returning. pcibios_alloc_controller() then needs to take the lock again before the list_add() but that's safe, the order of the list is not important.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jun 18, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 3th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.15.61 and later · before 5.15.63
  • linux linux kernel5.18.18 and later · before 5.19
  • linux linux kernel5.19.2 and later · before 5.19.4
  • linux linux kernel5.10.137
  • linux linux kernel6.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • e0274da3ac318296fed503422ccda98ce67e99cbaffected
    • a79e4395619c926ea7e828b2023c0fbe2776385b and later · before 6f75057c21eab12c6ccb7f06f859641a6edfab99affected · git
    • 205826dcac3271ab04fb97d66f1b4f8219723259 and later · before 5db5ce0f1963c6c8275719a80cb65e9c98d32726affected · git
    • 3ec50b8a0128359ff4ad4061a75c3322d0ab6ac9 and later · before ccb0a42d3f40c436295e0fef57ab613ae5b925a4affected · git
    • 47a8fe1b154aa6d836582365b1c70684af8597e4 and later · before a868f771ee41c97a25a04b8c632a7f06689b307baffected · git
    • ef0f4eeaba2463a77ac5a4e42c30717deb3c7b62 and later · before 1d9e75c3d8cdf7c96a94cb77450d4ee070279e6aaffected · git
    • f35c7f506fb96a23a1961c7314c5931ec8bc473e and later · before 90f195c01a2e8d8da6281791617e21109719c981affected · git
    • 0fe1e96fef0a5c53b4c0d1500d356f3906000f81 and later · before 8d48562a2729742f767b0fdd994d6b2a56a49c63affected · git
    • 5.18.18 and later · before 5.19affected · semver
    • 5.10.137 and later · before 5.10.138affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.0.2-16.0.2-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2022-50043Jun 18, 2025 · net: fix potential refcount leak in ndisc_router_discovery()
    22Monitor
  • ← EarlierCVE-2022-50044Jun 18, 2025 · net: qrtr: start MHI channel after endpoit creation
    18Monitor
  • Later →CVE-2022-50046Jun 18, 2025 · net/sunrpc: fix potential memory leaks in rpc_sysfs_xprt_state_change()
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1d9e75c3d8cdf7c96a94cb77450d4ee070279e6aVendor (CNA)
Linux Linux5.10.138Vendor (CNA)
Linux Linux5.15.63Vendor (CNA)
Linux Linux5.19Vendor (CNA)
Linux Linux5.19.4Vendor (CNA)
Linux Linux5db5ce0f1963c6c8275719a80cb65e9c98d32726Vendor (CNA)
Linux Linux6f75057c21eab12c6ccb7f06f859641a6edfab99Vendor (CNA)
Linux Linux8d48562a2729742f767b0fdd994d6b2a56a49c63Vendor (CNA)
Linux Linux90f195c01a2e8d8da6281791617e21109719c981Vendor (CNA)
Linux Linuxa868f771ee41c97a25a04b8c632a7f06689b307bVendor (CNA)
Linux Linuxccb0a42d3f40c436295e0fef57ab613ae5b925a4Vendor (CNA)
debian:linux6.0.2-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-667 · Improper Locking

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records