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CVE Record

CVE-2023-52907: nfc: pn533: Wait for out_urb's completion in pn533_usb_send_frame()

In the Linux kernel, the following vulnerability has been resolved: nfc: pn533: Wait for out_urb's completion in pn533_usb_send_frame() Fix a use-after-free that occurs in hcd when in_urb sent from pn533_usb_send_frame() is completed earlier than out_urb. Its callback frees the skb data in pn533_send_async_complete() that is used as a transfer buffer of out_urb. Wait before sending in_urb until the callback of out_urb is called. To modify the callback of out_urb alone, separate the complete function of out_urb and ack_urb. Found by a modified version of syzkaller. BUG: KASAN: use-after-free in dummy_timer Call Trace: memcpy (mm/kasan/shadow.c:65) dummy_perform_transfer (drivers/usb/gadget/udc/dummy_hcd.c:1352) transfer (drivers/usb/gadget/udc/dummy_hcd.c:1453) dummy_timer (drivers/usb/gadget/udc/dummy_hcd.c:1972) arch_static_branch (arch/x86/include/asm/jump_label.h:27) static_key_false (include/linux/jump_label.h:207) timer_expire_exit (include/trace/events/timer.h:127) call_timer_fn (kernel/time/timer.c:1475) expire_timers (kernel/time/timer.c:1519) __run_timers (kernel/time/timer.c:1790) run_timer_softirq (kernel/time/timer.c:1803)

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2023-52907 is a Linux kernel memory-safety bug in the PN533 USB NFC driver. A local user could potentially trigger kernel memory corruption, with high confidentiality, integrity, and availability impact per CVSS. It is not listed as CISA KEV in the provided data, so active exploitation is not established.

Executive priority

Treat as a high-priority kernel update for Linux fleets where NFC/PN533 USB support is present. Business urgency is lower than internet-exposed remote bugs, but kernel memory corruption with local privileges can support privilege escalation or system compromise.

Technical view

The issue is a use-after-free in pn533_usb_send_frame(). If an input URB completes before the output URB, callback logic can free skb data still used as an output transfer buffer. The fix waits for out_urb completion and separates callbacks. It was found with a modified syzkaller and KASAN.

Likely exposure

Exposure is most relevant to Linux systems with the PN533 USB NFC driver enabled or in use. The CVSS vector is local, low complexity, low privileges, and no user interaction. Systems without this driver or hardware are likely less exposed, but kernel configuration and vendor backports should be verified.

Exploitation context

The provided sources show local attack characteristics and high impact, but do not show active exploitation, public exploit availability, or remote reachability. The bug was discovered through fuzzing, not reported as exploited in the provided bundle.

Researcher notes

Version evidence is limited to the provided CVE bundle and upstream stable commits. No CWE, exploit proof, or KEV listing is provided. Validate affectedness through kernel source, package changelogs, or distribution advisories because vendors may backport fixes without changing upstream version labels.

Mitigation direction

  • Apply Linux distribution kernel updates that include the referenced stable fixes.
  • Prioritize systems using PN533 USB NFC functionality or exposing NFC devices to local users.
  • If no update is available, check vendor guidance for supported temporary mitigations.
  • Track vendor advisories for backported fixes, not only upstream version numbers.

Validation and detection

  • Inventory Linux kernels and identify systems with PN533 USB NFC support enabled.
  • Confirm the running kernel includes a vendor backport or one referenced stable fix.
  • Review distribution security advisories for CVE-2023-52907 coverage.
  • Verify CISA KEV status before claiming active exploitation.
Prepared
Confidence
high
Sources
9

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

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2023-52907 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

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

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.

1CVSS vectors
3Timeline events
1ADP providers
8Source links

SSVC decision data

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

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2023-52907Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxc46ee38620a2aa2b25b16bc9738ace80dbff76a4, c46ee38620a2aa2b25b16bc9738ace80dbff76a4, c46ee38620a2aa2b25b16bc9738ace80dbff76a4, c46ee38620a2aa2b25b16bc9738ace80dbff76a4, c46ee38620a2aa2b25b16bc9738ace80dbff76a4, c46ee38620a2aa2b25b16bc9738ace80dbff76a4, c46ee38620a2aa2b25b16bc9738ace80dbff76a4unaffected
LinuxLinux3.1, 0, 4.14.303, 4.19.270, 5.4.229, 5.10.164, 5.15.89, 6.1.7, 6.2affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.