thunderbolt: Make the DP tunnel activation callback mandatory
In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Make the DP tunnel activation callback mandatory tb_tunnel_alloc_dp() takes an optional callback which is run from dprx_work once the DPRX capabilities read has completed. Without that callback tb_dp_dprx_start() reads the capabilities synchronously and never queues the work. It however always takes a tunnel reference which is only dropped by dprx_work itself or by tb_dp_dprx_stop() when cancel_delayed_work() actually canceled that work. That reference is thus leaked for every tunnel without a callback. The only tunnels without one are those from tb_tunnel_discover_dp(), which are activated again when restoring from hibernation. Pass the callback to tb_tunnel_discover_dp() as well and drop the synchronous path such that the DPRX capabilities are always read from dprx_work. Hibernation restore then also no longer blocks for up to 12 seconds while waiting for that read to complete. Also fix up the KUnit tests.
CVE-2026-98692
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-2026-98692
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": "d6d458d42e1e1544a18f37f1d5c840e00d5261b9",
"lessThan": "47d60ea801fc333a10c576691eca2e7840b02d3d",
"versionType": "git"
},
{
"status": "affected",
"version": "d6d458d42e1e1544a18f37f1d5c840e00d5261b9",
"lessThan": "12f5d8b85a66a0ac08d082517d92ce136f8c0d42",
"versionType": "git"
}
],
"programFiles": [
"drivers/thunderbolt/tb.c",
"drivers/thunderbolt/test.c",
"drivers/thunderbolt/tunnel.c",
"drivers/thunderbolt/tunnel.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/thunderbolt/tb.c",
"drivers/thunderbolt/test.c",
"drivers/thunderbolt/tunnel.c",
"drivers/thunderbolt/tunnel.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98692
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38692 · Revision 1
- Added to Heist Feed
- Publisher date