Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb()
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb() l2cap_sock_new_connection_cb() returned l2cap_pi(sk)->chan after release_sock(parent). Once the parent lock is dropped the newly enqueued child socket sk is reachable via the accept queue, so another task can accept and free it before the callback dereferences sk, resulting in a use-after-free. Rework the ->new_connection() op so the core, rather than the callback, owns the child channel's lifetime. The op now receives a pre-allocated new_chan and returns an errno instead of allocating and returning a channel. l2cap_new_connection() allocates the child channel and links it into the conn list via __l2cap_chan_add() before invoking the callback, so the conn-list reference keeps the channel alive once release_sock(parent) exposes the socket to other tasks. Channel configuration that was duplicated in l2cap_sock_init() and the various new_connection callbacks is consolidated into l2cap_chan_set_defaults(), which now inherits from the parent channel when one is supplied.
CVE-2026-64557
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-2026-64557
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": "8ffb929098a56939ac71509302eeab5b207bf262",
"lessThan": "b39298044e5534612511a2ff5de03ba5f6e7a820",
"versionType": "git"
},
{
"status": "affected",
"version": "8ffb929098a56939ac71509302eeab5b207bf262",
"lessThan": "8c37e4338c801ebb8cee52436c01c41e009f6e87",
"versionType": "git"
},
{
"status": "affected",
"version": "8ffb929098a56939ac71509302eeab5b207bf262",
"lessThan": "84e718b6a814edc84159361f9f454a4e92ae91ae",
"versionType": "git"
},
{
"status": "affected",
"version": "8ffb929098a56939ac71509302eeab5b207bf262",
"lessThan": "36da806f7fbaee56ad9e81859deec203f9728700",
"versionType": "git"
},
{
"status": "affected",
"version": "8ffb929098a56939ac71509302eeab5b207bf262",
"lessThan": "733e76e74e406c1d1ddc7369420dd8a47f48bb8a",
"versionType": "git"
},
{
"status": "affected",
"version": "8ffb929098a56939ac71509302eeab5b207bf262",
"lessThan": "6fef032af0092ed5ccb767239a9ac1bc38c08a40",
"versionType": "git"
}
],
"programFiles": [
"include/net/bluetooth/l2cap.h",
"net/bluetooth/6lowpan.c",
"net/bluetooth/l2cap_core.c",
"net/bluetooth/l2cap_sock.c",
"net/bluetooth/smp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/net/bluetooth/l2cap.h",
"net/bluetooth/6lowpan.c",
"net/bluetooth/l2cap_core.c",
"net/bluetooth/l2cap_sock.c",
"net/bluetooth/smp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64557
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41086 · Revision 1
- Added to Heist Feed
- Publisher date