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CVE Record

CVE-2022-48857: NFC: port100: fix use-after-free in port100_send_complete

In the Linux kernel, the following vulnerability has been resolved: NFC: port100: fix use-after-free in port100_send_complete Syzbot reported UAF in port100_send_complete(). The root case is in missing usb_kill_urb() calls on error handling path of ->probe function. port100_send_complete() accesses devm allocated memory which will be freed on probe failure. We should kill this urbs before returning an error from probe function to prevent reported use-after-free Fail log: BUG: KASAN: use-after-free in port100_send_complete+0x16e/0x1a0 drivers/nfc/port100.c:935 Read of size 1 at addr ffff88801bb59540 by task ksoftirqd/2/26 ... Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x303 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 port100_send_complete+0x16e/0x1a0 drivers/nfc/port100.c:935 __usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1670 ... Allocated by task 1255: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:524 alloc_dr drivers/base/devres.c:116 [inline] devm_kmalloc+0x96/0x1d0 drivers/base/devres.c:823 devm_kzalloc include/linux/device.h:209 [inline] port100_probe+0x8a/0x1320 drivers/nfc/port100.c:1502 Freed by task 1255: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0xff/0x140 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:236 [inline] __cache_free mm/slab.c:3437 [inline] kfree+0xf8/0x2b0 mm/slab.c:3794 release_nodes+0x112/0x1a0 drivers/base/devres.c:501 devres_release_all+0x114/0x190 drivers/base/devres.c:530 really_probe+0x626/0xcc0 drivers/base/dd.c:670

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel memory-safety bug in the NFC port100 USB driver. A failed device probe can leave USB work running after driver-managed memory is freed, causing a use-after-free. The provided evidence points to a kernel bug found by syzbot, not confirmed real-world exploitation.

Executive priority

Treat as a targeted kernel maintenance item, not an emergency internet-wide exposure. Patch affected Linux systems through normal kernel update channels, with faster handling for devices allowing physical USB/NFC interaction.

Technical view

In port100_probe error handling, missing usb_kill_urb() allowed port100_send_complete() to run after devm-allocated memory was released. KASAN reported the use-after-free in drivers/nfc/port100.c. Upstream stable commits are listed as fixes across supported Linux kernel branches.

Likely exposure

Exposure is most likely on Linux systems with the NFC port100 USB driver present and reachable through matching NFC/USB hardware. Broad internet-facing exposure is not indicated by the source bundle.

Exploitation context

The CVE is not listed as KEV in the provided data. The source describes syzbot/KASAN discovery and kernel stable fixes. No cited source confirms active exploitation, public weaponization, or a complete impact assessment.

Researcher notes

The evidence is limited to the CVE record, syzbot failure details, affected kernel version metadata, and upstream stable commit URLs. No CVSS, CWE, exploit confirmation, or vendor-specific package names are provided.

Mitigation direction

  • Apply Linux distribution kernel updates that include the referenced stable fixes.
  • Prioritize endpoints, kiosks, and embedded systems with NFC or untrusted USB access.
  • Check vendor advisories for temporary mitigations; none are specified in the source bundle.
  • If NFC/port100 is unused, assess disabling it under approved vendor guidance.

Validation and detection

  • Inventory running Linux kernel versions and compare against vendor-fixed packages.
  • Check whether the port100 NFC driver is built, loaded, or required.
  • Identify assets where users can attach USB/NFC devices physically.
  • Confirm patch status through distribution changelogs or the listed stable commits.
Prepared
Confidence
medium
Sources
10

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-2022-48857 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
2ADP providers
9Source 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

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

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux0347a6ab300a1532c298823408d6e51ccf4e4f45, 0347a6ab300a1532c298823408d6e51ccf4e4f45, 0347a6ab300a1532c298823408d6e51ccf4e4f45, 0347a6ab300a1532c298823408d6e51ccf4e4f45, 0347a6ab300a1532c298823408d6e51ccf4e4f45, 0347a6ab300a1532c298823408d6e51ccf4e4f45, 0347a6ab300a1532c298823408d6e51ccf4e4f45, 0347a6ab300a1532c298823408d6e51ccf4e4f45unaffected
LinuxLinux3.13, 0, 4.9.307, 4.14.272, 4.19.235, 5.4.185, 5.10.106, 5.15.29, 5.16.15, 5.17affected
Weakness

CWE details

No CWE listed

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