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CVE Record

CVE-2022-49525: media: cx25821: Fix the warning when removing the module

In the Linux kernel, the following vulnerability has been resolved: media: cx25821: Fix the warning when removing the module When removing the module, we will get the following warning: [ 14.746697] remove_proc_entry: removing non-empty directory 'irq/21', leaking at least 'cx25821[1]' [ 14.747449] WARNING: CPU: 4 PID: 368 at fs/proc/generic.c:717 remove_proc_entry+0x389/0x3f0 [ 14.751611] RIP: 0010:remove_proc_entry+0x389/0x3f0 [ 14.759589] Call Trace: [ 14.759792] <TASK> [ 14.759975] unregister_irq_proc+0x14c/0x170 [ 14.760340] irq_free_descs+0x94/0xe0 [ 14.760640] mp_unmap_irq+0xb6/0x100 [ 14.760937] acpi_unregister_gsi_ioapic+0x27/0x40 [ 14.761334] acpi_pci_irq_disable+0x1d3/0x320 [ 14.761688] pci_disable_device+0x1ad/0x380 [ 14.762027] ? _raw_spin_unlock_irqrestore+0x2d/0x60 [ 14.762442] ? cx25821_shutdown+0x20/0x9f0 [cx25821] [ 14.762848] cx25821_finidev+0x48/0xc0 [cx25821] [ 14.763242] pci_device_remove+0x92/0x240 Fix this by freeing the irq before call pci_disable_device().

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2022-49525 is a Linux kernel issue in the cx25821 media driver. The documented problem is a warning and leaked proc entry when the module is removed. The source does not describe remote attack, privilege escalation, data exposure, or active exploitation.

Executive priority

Treat as routine kernel maintenance unless cx25821 is used in production or stability warnings are observed. Prioritize through normal patch cycles, not emergency response, based on current evidence.

Technical view

In the cx25821 driver, module removal could call pci_disable_device() before freeing the IRQ. This left a non-empty /proc IRQ directory entry and generated a kernel warning. The referenced kernel stable commits change teardown order to free the IRQ before disabling the PCI device.

Likely exposure

Exposure appears limited to Linux systems with affected kernel builds where the cx25821 media driver is present and used or loadable. Systems without this driver or hardware are less likely to be practically affected. Distribution backports may change version-based conclusions.

Exploitation context

The only documented trigger is removing the cx25821 module. The bundle reports KEV=false and provides no evidence of active exploitation or public weaponization. Business impact is unclear from the available sources.

Researcher notes

The CVE record lacks CVSS, CWE, and explicit security impact. Analysis should focus on affected driver presence, stable-branch fix inclusion, and whether vendor kernels backported the teardown-order change.

Mitigation direction

  • Update to a kernel or vendor package containing the referenced stable fixes.
  • Check distribution advisories for backported fixes before relying on upstream version numbers.
  • If cx25821 is not needed, consider disabling it under vendor-approved configuration guidance.

Validation and detection

  • Inventory Linux kernels and confirm whether cx25821 is present or loadable.
  • Check vendor kernel changelogs for the referenced cx25821 IRQ teardown fix.
  • Review kernel logs for cx25821 removal warnings if the module is used.
  • Confirm remediation through package metadata or kernel source containing the fix.
Prepared
Confidence
medium
Sources
11

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

Conservative CVE-to-ATT&CK context

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CVE-2022-49525 mapping review

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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
0ADP providers
10Source links

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

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux02b20b0b4cde011f7ad6b5363fb88b93f7ad4e5b, 02b20b0b4cde011f7ad6b5363fb88b93f7ad4e5b, 02b20b0b4cde011f7ad6b5363fb88b93f7ad4e5b, 02b20b0b4cde011f7ad6b5363fb88b93f7ad4e5b, 02b20b0b4cde011f7ad6b5363fb88b93f7ad4e5b, 02b20b0b4cde011f7ad6b5363fb88b93f7ad4e5b, 02b20b0b4cde011f7ad6b5363fb88b93f7ad4e5b, 02b20b0b4cde011f7ad6b5363fb88b93f7ad4e5b, 02b20b0b4cde011f7ad6b5363fb88b93f7ad4e5bunaffected
LinuxLinux2.6.32, 0, 4.9.318, 4.14.283, 4.19.247, 5.4.198, 5.10.121, 5.15.46, 5.17.14, 5.18.3, 5.19affected
Weakness

CWE details

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