CVE-2023-54269SUNRPC: double free xprt_ctxt while still in use
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: double free xprt_ctxt while still in use When an RPC request is deferred, the rq_xprt_ctxt pointer is moved out of the svc_rqst into the svc_deferred_req. When the deferred request is revisited, the pointer is copied into the new svc_rqst - and also remains in the svc_deferred_req. In the (rare?) case that the request is deferred a second time, the old svc_deferred_req is reused - it still has all the correct content. However in that case the rq_xprt_ctxt pointer is NOT cleared so that when xpo_release_xprt is called, the ctxt is freed (UDP) or possible added to a free list (RDMA). When the deferred request is revisited for a second time, it will reference this ctxt which may be invalid, and the free the object a second time which is likely to oops. So change svc_defer() to *always* clear rq_xprt_ctxt, and assert that the value is now stored in the svc_deferred_req.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/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
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d before 7851771789e87108a92697194105ef0c9307dc5e; from 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 before fd86534872f445f54dc01e7db001e25eadf063a8; from 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 before e0c648627322a4c7e018e5c7f837c3c03e297dbb; from 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 before eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1; 11fab500f86403b2ebf6795feeade6e10302e448; from 5.15.35 before 5.15.113; from 5.17.4 before 5.18 | CNA record |
References
- https://git.kernel.org/stable/c/7851771789e87108a92697194105ef0c9307dc5e
- https://git.kernel.org/stable/c/fd86534872f445f54dc01e7db001e25eadf063a8
- https://git.kernel.org/stable/c/e0c648627322a4c7e018e5c7f837c3c03e297dbb
- https://git.kernel.org/stable/c/eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1
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.