mptcp: pm: kernel: drop pending ADD_ADDR when removing ID0
In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: kernel: drop pending ADD_ADDR when removing ID0 The in-kernel MPTCP path manager can leave a stale ADD_ADDR announcement entry alive when removing the id 0 endpoint. This happens because the id 0 removal path does not tear down pending announcements, unlike the non-zero id path. When the PM later reselects id 0 after adding another signal endpoint, it finds the stale anno_list entry and hits WARN_ON_ONCE(mptcp_pm_is_kernel()) in mptcp_pm_announced_alloc(). Root cause: asymmetry between removal paths. - Non-zero id path: mptcp_nl_remove_subflow_and_signal_addr() calls mptcp_pm_remove_announced() to clean up. - Id 0 path: mptcp_nl_remove_id_zero_address() skips cleanup entirely. Fix by making the id 0 path symmetric: call mptcp_pm_announced_remove() and decrement add_addr_signaled before queuing the RM_ADDR. Subtle detail: signal endpoints are stored in anno_list with port 0, but msk_local carries the connection's local port. In other words, entries linked to ID0 paths should have port == 0. A follow-up patch will ensure that. mptcp_pm_announced_remove() uses use_port=true for comparison. So clear the port before the lookup.
CVE-2026-97566
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-2026-97566
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": "740d798e8767d8a449902b1a1bbc70facfce19b5",
"lessThan": "189d60057e5f3d6a62e3d71a3cc428c9150bc14f",
"versionType": "git"
},
{
"status": "affected",
"version": "740d798e8767d8a449902b1a1bbc70facfce19b5",
"lessThan": "bacf23e7c9876c9f4170166b3597cb22ea3ed39b",
"versionType": "git"
},
{
"status": "affected",
"version": "740d798e8767d8a449902b1a1bbc70facfce19b5",
"lessThan": "d4a67a880654e1bfe318a31bea0bdbb026a09ade",
"versionType": "git"
},
{
"status": "affected",
"version": "740d798e8767d8a449902b1a1bbc70facfce19b5",
"lessThan": "545616b4e7325be3c61fc082538cb06d14f7b1db",
"versionType": "git"
},
{
"status": "affected",
"version": "740d798e8767d8a449902b1a1bbc70facfce19b5",
"lessThan": "2ac7d6e620764f1fc79eb4edd3610a7a661981ca",
"versionType": "git"
}
],
"programFiles": [
"net/mptcp/pm_kernel.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/mptcp/pm_kernel.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97566
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48787 · Revision 1
- Added to Heist Feed
- Publisher date