nfc: llcp: Fix race condition in accept_queue lifecycle
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: Fix race condition in accept_queue lifecycle In nfc_llcp_socket_release(), sockets and listener accept queues are walked under the local sockets rwlock and bh_lock_sock(). However, bh_lock_sock() does not synchronise against process-context lock_sock() held by nfc_llcp_accept_dequeue() during accept(). Because socket_release() does not check sock_owned_by_user(), both paths can concurrently unlink and release the same child socket, resulting in use-after-free or a NULL pointer dereference of child->parent in nfc_llcp_accept_unlink(). Fix this synchronisation race by having nfc_llcp_socket_release() use process-context lock_sock() instead of bh_lock_sock(): 1. Pop sockets from the local sockets list under the write lock using nfc_llcp_sock_list_pop() so lock_sock() can be acquired without holding the rwlock. 2. Because lock_sock() can sleep, defer the final release of the nfc_llcp_local structure to a workqueue (release_work). This avoids a sleeping-in-atomic bug when the last local reference is dropped from softirq context. Additionally, hold a single device reference on local from registration until final destruction. 3. In nfc_llcp_local_get(), use kref_get_unless_zero() to prevent resurrecting a local object whose teardown has been scheduled. 4. In llcp_sock_accept(), verify that the listener socket state is still LLCP_LISTEN after waking from schedule_timeout() to prevent hangs if the listener
CVE-2026-98580
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-2026-98580
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": "50b78b2a6500d0e97c204c1b6c51df8c17358bbe",
"lessThan": "54adcabb0f1deef1bdae5fc64779ed6d442721c9",
"versionType": "git"
},
{
"status": "affected",
"version": "50b78b2a6500d0e97c204c1b6c51df8c17358bbe",
"lessThan": "7c938aad5108382c6ad7453c4b5ee8ae3f3252ed",
"versionType": "git"
},
{
"status": "affected",
"version": "50b78b2a6500d0e97c204c1b6c51df8c17358bbe",
"lessThan": "d2093a0981138876212bc5f473bdbfba0786e064",
"versionType": "git"
},
{
"status": "affected",
"version": "50b78b2a6500d0e97c204c1b6c51df8c17358bbe",
"lessThan": "41256821762a7114906b178826d17098e2fa5992",
"versionType": "git"
},
{
"status": "affected",
"version": "50b78b2a6500d0e97c204c1b6c51df8c17358bbe",
"lessThan": "53867f6acb1af7f12d6485fa8a2819318f89083b",
"versionType": "git"
},
{
"status": "affected",
"version": "50b78b2a6500d0e97c204c1b6c51df8c17358bbe",
"lessThan": "da8a07757383614a8380a0f7dd54749d2687b82e",
"versionType": "git"
},
{
"status": "affected",
"version": "50b78b2a6500d0e97c204c1b6c51df8c17358bbe",
"lessThan": "d5e1c92d09caed19f2988739695ce611a86ba6f8",
"versionType": "git"
},
{
"status": "affected",
"version": "50b78b2a6500d0e97c204c1b6c51df8c17358bbe",
"lessThan": "c3eef2f988a3db9690369d7cef9a3344dd9788d3",
"versionType": "git"
}
],
"programFiles": [
"net/nfc/llcp.h",
"net/nfc/llcp_core.c",
"net/nfc/llcp_sock.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.7",
"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": [
"net/nfc/llcp.h",
"net/nfc/llcp_core.c",
"net/nfc/llcp_sock.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98580
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38600 · Revision 1
- Added to Heist Feed
- Publisher date