GHSA-RPWR-33RH-MW75
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-10-30 15:33In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_api: release all action references on NEWACTION failure
When a batched RTM_NEWACTION request replaces an existing action, tcf_idr_check_alloc() takes a temporary reference on it. If a later action fails to initialize, tcf_action_destroy() uses strict release semantics to clean up the actions initialized so far. For an action bound to a filter, the strict check returns -EPERM without dropping the temporary reference.
This error also makes tcf_action_destroy() return before releasing subsequent entries. Any new action initialized between the bound action and the failing entry is leaked together with its reserved IDR slot, preventing reuse of its index.
Use tcf_idr_release() to drop each reference held by the batch without rejecting bound actions. This allows cleanup to continue through all initialized entries and preserves the module reference release when an action is destroyed. Explicit action deletion and flushing retain their separate bind-count checks.
{
"affected": [],
"aliases": [
"CVE-2026-97616"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:15Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_api: release all action references on NEWACTION failure\n\nWhen a batched RTM_NEWACTION request replaces an existing action,\ntcf_idr_check_alloc() takes a temporary reference on it. If a later\naction fails to initialize, tcf_action_destroy() uses strict release\nsemantics to clean up the actions initialized so far. For an action\nbound to a filter, the strict check returns -EPERM without dropping\nthe temporary reference.\n\nThis error also makes tcf_action_destroy() return before releasing\nsubsequent entries. Any new action initialized between the bound\naction and the failing entry is leaked together with its reserved\nIDR slot, preventing reuse of its index.\n\nUse tcf_idr_release() to drop each reference held by the batch without\nrejecting bound actions. This allows cleanup to continue through all\ninitialized entries and preserves the module reference release when\nan action is destroyed. Explicit action deletion and flushing retain\ntheir separate bind-count checks.",
"id": "GHSA-rpwr-33rh-mw75",
"modified": "2026-10-30T15:33:49Z",
"published": "2026-09-25T12:31:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97616"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/048617743febf6530111cfb594e9bbbd7918bf67"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1b5730a1c7def8993b3feba764008d1ff5c9dcea"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/478eb5abb51931a152abab068f8a717b7ff480fd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/64b36eaef6ea5ada9aea4c2cf87099aaa8a4869b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b7133be1faa35b38f68d78a9f950f1dddf3eb8e5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b83a51a83e85411c050c7b16cdc43b331c6565be"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e469765708b1afa9b9565dbafca09e22ec4edfa7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f908c8a969946a45225fd7f9d9a85771e12ae0a8"
}
],
"schema_version": "1.4.0",
"severity": []
}
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