Bluetooth: RFCOMM: fix NULL dereference of dlc->session in RFCOMM_CONNINFO
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: fix NULL dereference of dlc->session in RFCOMM_CONNINFO The RFCOMM_CONNINFO getsockopt handler accepts a socket that is not connected as long as deferred setup is enabled: if (sk->sk_state != BT_CONNECTED && !rfcomm_pi(sk)->dlc->defer_setup) { err = -ENOTCONN; break; } l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk; dlc->defer_setup is set in rfcomm_sock_init() when rfcomm_connect_ind() creates a child socket for an incoming connection on a listening socket that has BT_DEFER_SETUP enabled. It is never cleared afterwards. The session, however, can go away underneath it. rfcomm_recv_disc() forces the dlc state before tearing it down: d->state = BT_CLOSED; __rfcomm_dlc_close(d, err); The RFCOMM_DEFER_SETUP early return in __rfcomm_dlc_close() only covers BT_CONNECT, BT_CONFIG, BT_OPEN and BT_CONNECT2, so with the state already BT_CLOSED that switch does not match and the function falls through to rfcomm_dlc_unlink(), which sets d->session = NULL, while d->defer_setup stays 1. A getsockopt(SOL_RFCOMM, RFCOMM_CONNINFO) on the accepted socket after that point therefore skips the -ENOTCONN path -- sk->sk_state is BT_CLOSED, but dlc->defer_setup is still set -- and dereferences the NULL session. No race is needed: once the DISC has been processed, the dereference is unconditional. Reproduced on a KASAN kernel under QEMU with a BR/EDR peer emulated over /dev/vhci: the peer brings up an ACL link, o
CVE-2026-98455
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-2026-98455
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": "bb23c0ab824653be4aa7dfca15b07b3059717004",
"lessThan": "c3aee3fc1287c8a555baf3895959087cb0c33fe8",
"versionType": "git"
},
{
"status": "affected",
"version": "bb23c0ab824653be4aa7dfca15b07b3059717004",
"lessThan": "4bf5ca47203049ce3648f750a53dcdc98bcc9e3e",
"versionType": "git"
},
{
"status": "affected",
"version": "bb23c0ab824653be4aa7dfca15b07b3059717004",
"lessThan": "1c4f7e1177da2f229be04139c27e5370a1cfba52",
"versionType": "git"
},
{
"status": "affected",
"version": "bb23c0ab824653be4aa7dfca15b07b3059717004",
"lessThan": "84ae3cfd7d3a63591a2eb4faa24faf678c6708aa",
"versionType": "git"
},
{
"status": "affected",
"version": "bb23c0ab824653be4aa7dfca15b07b3059717004",
"lessThan": "c7362f6a18ed167f52f08ce25eeec8a7818c5004",
"versionType": "git"
},
{
"status": "affected",
"version": "bb23c0ab824653be4aa7dfca15b07b3059717004",
"lessThan": "8f5b30cc12c409ff62891e47ed51e6bf0945a3ea",
"versionType": "git"
},
{
"status": "affected",
"version": "bb23c0ab824653be4aa7dfca15b07b3059717004",
"lessThan": "005b23d9e324fe5d0acbcfa70c625f2e81189046",
"versionType": "git"
},
{
"status": "affected",
"version": "bb23c0ab824653be4aa7dfca15b07b3059717004",
"lessThan": "46f8ffd0a1f1eb6cbc94946a92c11ef601e228a1",
"versionType": "git"
}
],
"programFiles": [
"net/bluetooth/rfcomm/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": "2.6.30"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.30",
"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/bluetooth/rfcomm/sock.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98455
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38508 · Revision 1
- Added to Heist Feed
- Publisher date