tipc: avoid busy looping in tipc_exit_net()
In the Linux kernel, the following vulnerability has been resolved: tipc: avoid busy looping in tipc_exit_net() Blamed commit introduced a busy-wait loop in tipc_exit_net() to wait for pending UDP bearer cleanup works to complete: while (atomic_read(&tn->wq_count)) cond_resched(); This loop can busy-wait for a long time if cond_resched() is a NOP. This typically happens if the netns exit is executed by a high priority task, or under kernels configured without preemption (CONFIG_PREEMPT_NONE). In such cases, it wastes CPU cycles and can lead to soft lockups. Fix this by replacing the busy loop with wait_var_event(), allowing the thread to sleep properly until the work queue count reaches zero. Accordingly, update cleanup_bearer() to use atomic_dec_and_test() and wake_up_var() to wake up the waiter when the count drops to zero. This uses the global wait queue hash table, avoiding the need to bloat struct tipc_net with a wait_queue_head_t. The atomic_dec_and_test() provides the necessary memory barrier to ensure the wakeup is not missed.
CVE-2026-80866
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-2026-80866
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": "04c26faa51d1e2fe71cf13c45791f5174c37f986",
"lessThan": "99b82c8452887408ea908fdfa5df33c4a5dfa88f",
"versionType": "git"
},
{
"status": "affected",
"version": "04c26faa51d1e2fe71cf13c45791f5174c37f986",
"lessThan": "110bb16d37bdba03213156c0df37e7119c190936",
"versionType": "git"
},
{
"status": "affected",
"version": "04c26faa51d1e2fe71cf13c45791f5174c37f986",
"lessThan": "7672973957e3e20780afe5937a9fec70b72bc060",
"versionType": "git"
},
{
"status": "affected",
"version": "04c26faa51d1e2fe71cf13c45791f5174c37f986",
"lessThan": "522d1d950b9e3b68190a6de7534827c8dccedb73",
"versionType": "git"
},
{
"status": "affected",
"version": "04c26faa51d1e2fe71cf13c45791f5174c37f986",
"lessThan": "c1481c94e74c955e0448ddf46b8615a44d840c1e",
"versionType": "git"
},
{
"status": "affected",
"version": "d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa",
"versionType": "git"
},
{
"status": "affected",
"version": "5195ec5e365a2a9331bfeb585b613a6e94f98dba",
"versionType": "git"
},
{
"status": "affected",
"version": "b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d",
"versionType": "git"
},
{
"status": "affected",
"version": "5.4.124",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.42",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.12.9",
"lessThan": "5.13",
"versionType": "semver"
}
],
"programFiles": [
"net/tipc/core.c",
"net/tipc/udp_media.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": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"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": [
"net/tipc/core.c",
"net/tipc/udp_media.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80866
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46642 · Revision 1
- Added to Heist Feed
- Publisher date