Bluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_conn_del()
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_conn_del() bt_accept_dequeue() unlinks a not-yet-accepted child from the parent accept queue and release_sock()s it before returning, so the returned sk has no caller reference and is unlocked. l2cap_sock_cleanup_listen() walks these children on listening-socket close. A concurrent HCI disconnect drives hci_rx_work -> l2cap_conn_del() which runs l2cap_chan_del() + l2cap_sock_kill() and frees the child sk and its l2cap_chan; cleanup_listen() then uses both: BUG: KASAN: slab-use-after-free in l2cap_sock_kill l2cap_sock_kill / l2cap_sock_cleanup_listen / __x64_sys_close Freed by: l2cap_conn_del -> l2cap_sock_close_cb -> l2cap_sock_kill This is distinct from the two fixes already in this area: commit e83f5e24da741 ("Bluetooth: serialize accept_q access") serialises the accept_q list/poll and takes temporary refs inside bt_accept_dequeue(), and CVE-2025-39860 serialises the userspace close()/accept() race by calling cleanup_listen() under lock_sock() in l2cap_sock_release(). Neither covers l2cap_conn_del() running from hci_rx_work, so this UAF still reproduces on current bluetooth/master. Take the reference at the source: bt_accept_dequeue() does sock_hold() while sk is still locked, before release_sock(); callers sock_put(). cleanup_listen() pins the chan with l2cap_chan_hold_unless_zero() under a brief child sk lock (serialising vs l2cap_sock_teardown_cb
CVE-2026-53357
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-2026-53357
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": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "751de6ec671fe75ad9cf65a0638d2a06b6a5984d",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "407217734835d21d4e0105ebf347860dc1806f88",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "7eebd4c2c86f573af87ff165d08a83432eb0b919",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "5d86d2f1b4d9a508c441d3e45277ae1a73cfed57",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "87c543e2f78d0871f271df92dab98901bbd5b6f5",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "added1213395071470a900cc845a042fb51882a6",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "a5ca86a6097a8b030ca3226cd300b17ed330f966",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "ab1513597c6cf17cd1ad2a21e3b045421b48e022",
"versionType": "git"
}
],
"programFiles": [
"net/bluetooth/af_bluetooth.c",
"net/bluetooth/iso.c",
"net/bluetooth/l2cap_sock.c",
"net/bluetooth/rfcomm/sock.c",
"net/bluetooth/sco.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.142",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.92",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.34",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.11",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bluetooth/af_bluetooth.c",
"net/bluetooth/iso.c",
"net/bluetooth/l2cap_sock.c",
"net/bluetooth/rfcomm/sock.c",
"net/bluetooth/sco.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53357
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40809 · Revision 1
- Added to Heist Feed
- Publisher date