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CVE Record

CVE-2022-48752: powerpc/perf: Fix power_pmu_disable to call clear_pmi_irq_pending only if PMI is pending

In the Linux kernel, the following vulnerability has been resolved: powerpc/perf: Fix power_pmu_disable to call clear_pmi_irq_pending only if PMI is pending Running selftest with CONFIG_PPC_IRQ_SOFT_MASK_DEBUG enabled in kernel triggered below warning: [ 172.851380] ------------[ cut here ]------------ [ 172.851391] WARNING: CPU: 8 PID: 2901 at arch/powerpc/include/asm/hw_irq.h:246 power_pmu_disable+0x270/0x280 [ 172.851402] Modules linked in: dm_mod bonding nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables rfkill nfnetlink sunrpc xfs libcrc32c pseries_rng xts vmx_crypto uio_pdrv_genirq uio sch_fq_codel ip_tables ext4 mbcache jbd2 sd_mod t10_pi sg ibmvscsi ibmveth scsi_transport_srp fuse [ 172.851442] CPU: 8 PID: 2901 Comm: lost_exception_ Not tainted 5.16.0-rc5-03218-g798527287598 #2 [ 172.851451] NIP: c00000000013d600 LR: c00000000013d5a4 CTR: c00000000013b180 [ 172.851458] REGS: c000000017687860 TRAP: 0700 Not tainted (5.16.0-rc5-03218-g798527287598) [ 172.851465] MSR: 8000000000029033 <SF,EE,ME,IR,DR,RI,LE> CR: 48004884 XER: 20040000 [ 172.851482] CFAR: c00000000013d5b4 IRQMASK: 1 [ 172.851482] GPR00: c00000000013d5a4 c000000017687b00 c000000002a10600 0000000000000004 [ 172.851482] GPR04: 0000000082004000 c0000008ba08f0a8 0000000000000000 00000008b7ed0000 [ 172.851482] GPR08: 00000000446194f6 0000000000008000 c00000000013b118 c000000000d58e68 [ 172.851482] GPR12: c00000000013d390 c00000001ec54a80 0000000000000000 0000000000000000 [ 172.851482] GPR16: 0000000000000000 0000000000000000 c000000015d5c708 c0000000025396d0 [ 172.851482] GPR20: 0000000000000000 0000000000000000 c00000000a3bbf40 0000000000000003 [ 172.851482] GPR24: 0000000000000000 c0000008ba097400 c0000000161e0d00 c00000000a3bb600 [ 172.851482] GPR28: c000000015d5c700 0000000000000001 0000000082384090 c0000008ba0020d8 [ 172.851549] NIP [c00000000013d600] power_pmu_disable+0x270/0x280 [ 172.851557] LR [c00000000013d5a4] power_pmu_disable+0x214/0x280 [ 172.851565] Call Trace: [ 172.851568] [c000000017687b00] [c00000000013d5a4] power_pmu_disable+0x214/0x280 (unreliable) [ 172.851579] [c000000017687b40] [c0000000003403ac] perf_pmu_disable+0x4c/0x60 [ 172.851588] [c000000017687b60] [c0000000003445e4] __perf_event_task_sched_out+0x1d4/0x660 [ 172.851596] [c000000017687c50] [c000000000d1175c] __schedule+0xbcc/0x12a0 [ 172.851602] [c000000017687d60] [c000000000d11ea8] schedule+0x78/0x140 [ 172.851608] [c000000017687d90] [c0000000001a8080] sys_sched_yield+0x20/0x40 [ 172.851615] [c000000017687db0] [c0000000000334dc] system_call_exception+0x18c/0x380 [ 172.851622] [c000000017687e10] [c00000000000c74c] system_call_common+0xec/0x268 The warning indicates that MSR_EE being set(interrupt enabled) when there was an overflown PMC detected. This could happen in power_pmu_disable since it runs under interrupt soft disable condition ( local_irq_save ) and not with interrupts hard disabled. commit 2c9ac51b850d ("powerpc/perf: Fix PMU callbacks to clear pending PMI before resetting an overflown PMC") intended to clear PMI pending bit in Paca when disabling the PMU. It could happen that PMC gets overflown while code is in power_pmu_disable callback function. Hence add a check to see if PMI pending bit is set in Paca before clearing it via clear_pmi_pending.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel PowerPC performance-monitoring bug. The reported failure is a kernel warning during a selftest, caused by incorrect handling of a pending performance-monitor interrupt. The bundle does not show remote attack exposure, active exploitation, or business-wide impact beyond affected PowerPC Linux systems.

Executive priority

Treat this as targeted kernel maintenance for PowerPC environments, not an internet-wide emergency. Escalate only if the organization runs PowerPC Linux workloads with outdated or custom kernels and cannot confirm backported fixes.

Technical view

In powerpc/perf, power_pmu_disable could call clear_pmi_irq_pending while only soft-disabling interrupts. A performance monitor counter could overflow during that path, triggering a warning with CONFIG_PPC_IRQ_SOFT_MASK_DEBUG. The fix adds a check that the PMI pending bit is set before clearing it.

Likely exposure

Exposure appears limited to Linux kernel deployments on PowerPC using the perf/PMU code path. The source bundle lists stable kernel references and versions 5.10.94, 5.15.17, and 5.16.3 as unaffected, but does not provide a complete affected-version range.

Exploitation context

The provided sources do not indicate active exploitation, KEV listing, public exploit use, remote reachability, privilege impact, or data compromise. Evidence is a kernel selftest warning and stable kernel fix metadata, so exploitability and practical security impact remain unclear from this bundle.

Researcher notes

The source evidence centers on interrupt-state correctness in powerpc/perf and a warning under CONFIG_PPC_IRQ_SOFT_MASK_DEBUG. No CVSS, CWE, exploit primitive, attacker preconditions, or complete affected-version range is provided. Further impact analysis should use vendor kernel advisories and patch provenance.

Mitigation direction

  • Update to a vendor kernel containing the referenced stable fixes or later fixed release.
  • Confirm whether distribution kernels have backported the PowerPC perf fix.
  • Prioritize PowerPC Linux systems where perf or PMU functionality is operationally relevant.
  • If patch status is unclear, check vendor security guidance before changing configuration.

Validation and detection

  • Inventory Linux systems running on PowerPC hardware or virtual platforms.
  • Record kernel versions and distribution backport identifiers for those systems.
  • Compare installed kernels against vendor advisories and referenced stable commits.
  • Confirm fixed versions or backports in staging before production rollout.
  • Document any PowerPC systems that remain unpatched or unsupported.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

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ADP provider summaries

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CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxef798cd035f316a537fee8ed170c127f12407085, fadcafa3959281ce2d96feedece8c75c3f95f8a5, 215a90ce3754fe509efbce6b73a4bb643c7e7528, 2c9ac51b850d84ee496b0a5d832ce66d411ae552unaffected
LinuxLinux5.10.94, 5.15.17, 5.16.3unaffected
Weakness

CWE details

No CWE listed

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