Bluetooth: RFCOMM: Fix NULL tty_dev dereference in rfcomm_dev_shutdown
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: Fix NULL tty_dev dereference in rfcomm_dev_shutdown syzbot hit a NULL pointer dereference in rfcomm_dev_shutdown() when an RFCOMM tty is closed. rfcomm_dev_add() puts the new device on rfcomm_dev_list first and only then registers the tty device and saves it in dev->tty_dev. If that registration fails, dev->tty_dev is never set at all. The device can be looked up in the meantime, so an open() of /dev/rfcommN gets through rfcomm_tty_install() and attaches to it. When that tty is closed again, rfcomm_dev_shutdown() uses dev->tty_dev without checking it: Oops: general protection fault, probably for non-canonical address KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047] RIP: 0010:rfcomm_dev_shutdown+0x48/0xb0 net/bluetooth/rfcomm/tty.c:131 Call Trace: tty_port_shutdown+0x1bf/0x220 drivers/tty/tty_port.c:372 tty_port_close+0x4e/0x150 drivers/tty/tty_port.c:705 tty_release+0x359/0x1670 drivers/tty/tty_io.c:1718 __fput+0x418/0xa50 fs/file_table.c:512 rfcomm_dev_destruct() already copes with a NULL dev->tty_dev. Add the same check to rfcomm_dev_shutdown(), so the tty device is only moved when it was actually registered.
CVE-2026-99008
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-2026-99008
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": "cad348a17e170451ea8688b532a6ca3e98c63b60",
"lessThan": "d5c372ad03330f02962d4860df4d355ab25487df",
"versionType": "git"
},
{
"status": "affected",
"version": "cad348a17e170451ea8688b532a6ca3e98c63b60",
"lessThan": "3fd5164bdb04635caa7942ddb554b0ec699a9433",
"versionType": "git"
},
{
"status": "affected",
"version": "cad348a17e170451ea8688b532a6ca3e98c63b60",
"lessThan": "a661f401f83b8462f2d424e0a1a72b7681e92ea2",
"versionType": "git"
},
{
"status": "affected",
"version": "cad348a17e170451ea8688b532a6ca3e98c63b60",
"lessThan": "d0aef0b0374678153244f162df507106d728af39",
"versionType": "git"
},
{
"status": "affected",
"version": "cad348a17e170451ea8688b532a6ca3e98c63b60",
"lessThan": "08e90633377f1b2567ab5ad6810b74c552246a07",
"versionType": "git"
}
],
"programFiles": [
"net/bluetooth/rfcomm/tty.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.11",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bluetooth/rfcomm/tty.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-99008
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #52850 · Revision 1
- Added to Heist Feed
- Publisher date