nfc: fix use-after-free in nfc_get_local_general_bytes
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().
CVE-2026-98483
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98483
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"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"
}
],
"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"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"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"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98483
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38529 · Revision 1
- Added to Heist Feed
- Publisher date