Kernel compromise via NFC rfkill teardown race
Published Feb 26, 2025 · Updated Aug 5, 2026
Use-after-free in affected Linux kernel releases allows local users to gain kernel access or crash the host through an NFC race. nfc_unregister_device destroys the rfkill object before device_del, while concurrent NFC_CMD_DEV_UP processing in nfc_dev_up dereferences the stale dev->rfkill pointer. Low-privileged local access and NFC support are required; successful exploitation enables kernel reads or writes, while the demonstrated failure is a kernel panic.
Summary
What happened
Use-after-free in affected Linux kernel releases allows local users to gain kernel access or crash the host through an NFC race. nfc_unregister_device destroys the rfkill object before device_del, while concurrent NFC_CMD_DEV_UP processing in nfc_dev_up dereferences the stale dev->rfkill pointer. Low-privileged local access and NFC support are required; successful exploitation enables kernel reads or writes, while the demonstrated failure is a kernel panic.
The record
- CVE
- CVE-2022-49505
- Published
- Feb 26, 2025
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 26, 2025CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=307d2e6cebfca9d92f86c8e2c8e3dd4a8be46ba6 <fbf9c4c714d3cdeb98b6a18e4d057f931cad1d81
- Affected versionversion=3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 <1b0e81416a24d6e9b8c2341e22e8bf48f8b8bfc9
- Affected versionversion=3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 <4a68938f43b7c2663e4c90bb9bbe29ac8b9a42a0
- Affected versionversion=3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 <4f5d71930f41be78557f9714393179025baacd65
- Affected versionversion=4.14.256 <4.14.283
- Affected versionversion=4.19.218 <4.19.247
- Affected versionversion=4.4.293 <4.5
- Affected versionversion=47244ac0b65bd74cc70007d8e1bac68bd2baad19 <f81270125b50532624400063281e6611ecd61ddf
- Affected versionversion=4.9.291 <4.9.318
- Affected versionversion=5.10.82 <5.10.121
- Affected versionversion=5.15.5 <5.15.46
- Affected versionversion=5.16
- Affected versionversion=5.4.162 <5.4.198
- Affected versionversion=5ef16d2d172ee56714cff37cd005b98aba08ef5a
- Affected versionversion=73a0d12114b4bc1a9def79a623264754b9df698e <2a1b5110c95e4d49c8c3906270dfcde680a5a7be
- Affected versionversion=8a9c61c3ef187d8891225f9b932390670a43a0d3 <1632be63862f183cd5cf1cc094e698e6ec005dfd
- Affected versionversion=c45cea83e13699bdfd47842e04d09dd43af4c371 <6abfaca8711803d0d7cc8c0fac1070a88509d463
- Affected versionversion=ff169909eac9e00bf1aa0af739ba6ddfb1b1d135 <a8e03bcad52dc9afabf650fdbad84f739cec9efa
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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