CVE-2026-98483
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: nfc: fix use-after-free in nfc_get_local_general_bytes Commit 6709d4b7bc2e ("net: nfc: Fix use-after-free caused by nfc_llcp_find_local") attempted to fix a use-after-free (UAF) issue by invoking nfc_llcp_local_put(local) after accessing local->gb. However, if the reference count drops to zero, local is freed immediately, leading to a use-after-free when callers access the returned pointer. Alternative approaches using dynamic allocation (e.g. kmemdup) introduced memory leaks because callers consistently treat the returned pointer as borrowed memory. Fix this properly by refactoring nfc_llcp_general_bytes() and nfc_get_local_general_bytes() to accept a caller-provided output buffer (out_gb) and its maximum length (gb_max_len). The general bytes are safely copied into out_gb before calling nfc_llcp_local_put(local), ensuring safe lifetime management without ownership transfer complications. Update all callers across drivers (microread, pn533, pn544, st21nfca, digital_dep, and nci) to provide their own destination buffers and pass them to nfc_get_local_general_bytes().
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-10-18 16:16:58.940000
Last modified
2026-10-19 10:18:59.677000
View original CVE JSON
{
"id": "CVE-2026-98483",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-10-18T16:16:58.940",
"lastModified": "2026-10-19T10:18:59.677",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: fix use-after-free in nfc_get_local_general_bytes\n\nCommit 6709d4b7bc2e (\"net: nfc: Fix use-after-free caused by\nnfc_llcp_find_local\") attempted to fix a use-after-free (UAF) issue by\ninvoking nfc_llcp_local_put(local) after accessing local->gb. However,\nif the reference count drops to zero, local is freed immediately,\nleading to a use-after-free when callers access the returned pointer.\nAlternative approaches using dynamic allocation (e.g. kmemdup) introduced\nmemory leaks because callers consistently treat the returned pointer as\nborrowed memory.\n\nFix this properly by refactoring nfc_llcp_general_bytes() and\nnfc_get_local_general_bytes() to accept a caller-provided output buffer\n(out_gb) and its maximum length (gb_max_len). The general bytes are\nsafely copied into out_gb before calling nfc_llcp_local_put(local),\nensuring safe lifetime management without ownership transfer complications.\n\nUpdate all callers across drivers (microread, pn533, pn544, st21nfca,\ndigital_dep, and nci) to provide their own destination buffers and pass\nthem to nfc_get_local_general_bytes()."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/nfc/microread/microread.c",
"drivers/nfc/pn533/pn533.c",
"drivers/nfc/pn533/pn533.h",
"drivers/nfc/pn544/pn544.c",
"drivers/nfc/st21nfca/core.c",
"include/net/nfc/hci.h",
"include/net/nfc/nfc.h",
"net/nfc/core.c",
"net/nfc/digital_dep.c",
"net/nfc/llcp_core.c",
"net/nfc/nci/core.c",
"net/nfc/nfc.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "96f2c6f272ec04083d828de46285a7d7b17d1aad",
"lessThan": "25bfa673adc70189c0bc872940421ae59f789cf6",
"versionType": "git",
"status": "affected"
},
{
"version": "fc8429f8d86801f092fbfbd257c3af821ac0dcd3",
"lessThan": "2b31d0cc95856c856ada91f943fb14dfdf29a923",
"versionType": "git",
"status": "affected"
},
{
"version": "425d9d3a92df7d96b3cfb7ee5c240293a21cbde3",
"lessThan": "c40f61a6a413f3eaf028e5fe367fd9749e503ab0",
"versionType": "git",
"status": "affected"
},
{
"version": "6709d4b7bc2e079241fdef15d1160581c5261c10",
"lessThan": "19bcfc2a56d0b82919079b5424c5a9a0ac897dcf",
"versionType": "git",
"status": "affected"
},
{
"version": "6709d4b7bc2e079241fdef15d1160581c5261c10",
"lessThan": "d8c929e9afdbc33b1876ecb97a517e850449b5bd",
"versionType": "git",
"status": "affected"
},
{
"version": "6709d4b7bc2e079241fdef15d1160581c5261c10",
"lessThan": "841af260ff477f6191872bc3b2e15488615c1827",
"versionType": "git",
"status": "affected"
},
{
"version": "6709d4b7bc2e079241fdef15d1160581c5261c10",
"lessThan": "9ede11e12f965ace97c4e0f606667f24fb41e7e1",
"versionType": "git",
"status": "affected"
},
{
"version": "6709d4b7bc2e079241fdef15d1160581c5261c10",
"lessThan": "dcab71a7011918f6fdba7adcec02d217dcb84b8d",
"versionType": "git",
"status": "affected"
},
{
"version": "dd6ff3f3862709ab1a12566e73b9d6a9b8f6e548",
"versionType": "git",
"status": "affected"
},
{
"version": "b3ad46e155a6d91b36c6e892019a43e3ef3c696d",
"versionType": "git",
"status": "affected"
},
{
"version": "e5207c1d69b1a9707615ab6ff9376e59fc096815",
"versionType": "git",
"status": "affected"
},
{
"version": "5.10.188",
"lessThan": "5.10.271",
"versionType": "semver",
"status": "affected"
},
{
"version": "5.15.121",
"lessThan": "5.15.222",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.1.39",
"lessThan": "6.1.189",
"versionType": "semver",
"status": "affected"
},
{
"version": "5.4.251",
"lessThan": "5.5",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.3.13",
"lessThan": "6.4",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.4.4",
"lessThan": "6.5",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/nfc/microread/microread.c",
"drivers/nfc/pn533/pn533.c",
"drivers/nfc/pn533/pn533.h",
"drivers/nfc/pn544/pn544.c",
"drivers/nfc/st21nfca/core.c",
"include/net/nfc/hci.h",
"include/net/nfc/nfc.h",
"net/nfc/core.c",
"net/nfc/digital_dep.c",
"net/nfc/llcp_core.c",
"net/nfc/nci/core.c",
"net/nfc/nfc.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.5",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.5",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.271",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.222",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.189",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.158",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.112",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.55",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.9",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/19bcfc2a56d0b82919079b5424c5a9a0ac897dcf",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/25bfa673adc70189c0bc872940421ae59f789cf6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/2b31d0cc95856c856ada91f943fb14dfdf29a923",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/841af260ff477f6191872bc3b2e15488615c1827",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
"url": "https://git.kernel.org/stable/c/9ede11e12f965ace97c4e0f606667f24fb41e7e1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
"url": "https://git.kernel.org/stable/c/c40f61a6a413f3eaf028e5fe367fd9749e503ab0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
"url": "https://git.kernel.org/stable/c/d8c929e9afdbc33b1876ecb97a517e850449b5bd",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}