CVE-2026-89545sunrpc: defer rq_argp and rq_resp free until after RCU grace period
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: sunrpc: defer rq_argp and rq_resp free until after RCU grace period svc_rqst_free() frees rqstp->rq_argp and rqstp->rq_resp synchronously via kfree(), but defers the rqstp struct free via kfree_rcu(). After svc_exit_thread() calls list_del_rcu() and svc_rqst_free(), there is a window where RCU readers that started before list_del_rcu() can still traverse the thread list and find the rqstp. These readers (e.g. nfsd_nl_rpc_status_get_dumpit()) dereference rqstp->rq_argp, which has already been freed — a use-after-free. Fix this by moving the kfree of rq_argp and rq_resp into an explicit call_rcu() callback alongside the struct free. Resources not accessed by RCU readers (bvec, buffer pages, scratch folio, auth_data) remain synchronously freed.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 812443865c5fc255363d4a684a62c086af1addca builds before 0ea49d69aa806008b2424c8cf21cf746b9963967; 812443865c5fc255363d4a684a62c086af1addca builds before 08bc49e0541260bf294962cf889a32a2d2713ad6; from 812443865c5fc255363d4a684a62c086af1addca before e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090; from 812443865c5fc255363d4a684a62c086af1addca before c479bde671cbe2f9e152834a8b0eb7c3c295bbaf | CNA record |
References
- https://git.kernel.org/stable/c/0ea49d69aa806008b2424c8cf21cf746b9963967
- https://git.kernel.org/stable/c/08bc49e0541260bf294962cf889a32a2d2713ad6
- https://git.kernel.org/stable/c/e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090
- https://git.kernel.org/stable/c/c479bde671cbe2f9e152834a8b0eb7c3c295bbaf
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.