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CVE Record

CVE-2022-50656: nfc: pn533: Clear nfc_target before being used

In the Linux kernel, the following vulnerability has been resolved: nfc: pn533: Clear nfc_target before being used Fix a slab-out-of-bounds read that occurs in nla_put() called from nfc_genl_send_target() when target->sensb_res_len, which is duplicated from an nfc_target in pn533, is too large as the nfc_target is not properly initialized and retains garbage values. Clear nfc_targets with memset() before they are used. Found by a modified version of syzkaller. BUG: KASAN: slab-out-of-bounds in nla_put Call Trace: memcpy nla_put nfc_genl_dump_targets genl_lock_dumpit netlink_dump __netlink_dump_start genl_family_rcv_msg_dumpit genl_rcv_msg netlink_rcv_skb genl_rcv netlink_unicast netlink_sendmsg sock_sendmsg ____sys_sendmsg ___sys_sendmsg __sys_sendmsg do_syscall_64

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-50656 is a Linux kernel NFC driver bug. The pn533 driver may use uninitialized target data, causing an out-of-bounds read in kernel memory handling. Business urgency is highest for systems using NFC hardware or kernels with this driver enabled. No public source here indicates active exploitation.

Executive priority

Treat as a targeted kernel maintenance issue, not an internet-scale emergency. Patch during normal security update cycles, faster where NFC is used in endpoints, embedded devices, kiosks, or physical-access workflows.

Technical view

The issue is in Linux kernel NFC pn533 handling. An nfc_target structure was not cleared before use, leaving garbage values such as an excessive sensb_res_len. This can trigger a slab-out-of-bounds read in nla_put() through nfc_genl_send_target()/nfc_genl_dump_targets(). The fix initializes nfc_target with memset().

Likely exposure

Exposure appears limited to Linux systems running affected kernel versions with the NFC pn533 driver present or enabled. Servers without NFC hardware or NFC kernel support are less likely to be exposed. The source bundle lists affected Linux versions but does not provide a CVSS score.

Exploitation context

The bug was found by a modified syzkaller fuzzer. The provided sources do not show KEV listing, active exploitation, public exploit code, or confirmed real-world attacks. Practical exploitability is not established in the provided evidence.

Researcher notes

Evidence is incomplete: no CVSS, CWE, or vendor exploitation assessment is provided. The source describes an out-of-bounds read and stable kernel commits fixing initialization. Avoid assuming privilege escalation or remote exploitability without additional vendor or researcher confirmation.

Mitigation direction

  • Update to a Linux kernel or distribution package containing the referenced stable fixes.
  • Prioritize systems with NFC hardware, pn533 support, or exposed NFC functionality.
  • If immediate patching is not possible, review vendor guidance for disabling unused NFC support.

Validation and detection

  • Inventory Linux kernel versions across affected assets.
  • Check whether NFC and pn533 driver support is enabled or loaded.
  • Confirm the running kernel includes the relevant stable commit for its branch.
  • Track distribution advisories for backported fixes and package status.
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-2022-50656 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
0Timeline events
0ADP providers
10Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux361f3cb7f9cfdb82c80926d0e7843c098c034545, 361f3cb7f9cfdb82c80926d0e7843c098c034545, 361f3cb7f9cfdb82c80926d0e7843c098c034545, 361f3cb7f9cfdb82c80926d0e7843c098c034545, 361f3cb7f9cfdb82c80926d0e7843c098c034545, 361f3cb7f9cfdb82c80926d0e7843c098c034545, 361f3cb7f9cfdb82c80926d0e7843c098c034545, 361f3cb7f9cfdb82c80926d0e7843c098c034545, 361f3cb7f9cfdb82c80926d0e7843c098c034545unaffected
LinuxLinux3.3, 0, 4.9.337, 4.14.303, 4.19.270, 5.4.229, 5.10.163, 5.15.86, 6.0.16, 6.1.2, 6.2affected
Weakness

CWE details

No CWE listed

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