CVE-2026-64115vsock/vmci: fix UAF when peer resets connection during handshake
- 8.8HighCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: vsock/vmci: fix UAF when peer resets connection during handshake vmci_transport_recv_connecting_server() returned err = 0 for a peer RST in its default switch arm: err = pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL; That made vmci_transport_recv_listen() skip vsock_remove_pending(), leaving the pending socket on the listener's pending_links with sk_state = TCP_CLOSE while destroy: still dropped the explicit reference taken before schedule_delayed_work(). One second later vsock_pending_work() observed is_pending=true and performed full cleanup: vsock_remove_pending() then the two trailing sock_put(sk) calls -- the first reached refcount 0 and __sk_freed the socket, and the second wrote into the freed object: BUG: KASAN: slab-use-after-free in refcount_warn_saturate Write of size 4 at addr ffff88800b1cac80 by task kworker Workqueue: events vsock_pending_work Treat peer RST like any other unexpected packet type (err = -EINVAL). All destroy: arms now return err < 0, so vmci_transport_recv_listen() removes pending from pending_links synchronously and vsock_pending_work() takes the is_pending=false / !rejected branch, dropping only its own work reference. This also closes the multi-packet race Sashiko reported on v2: pending is removed from the list before any subsequent packet can find it. The pre-existing sk_acceptq_removed() gap on the err < 0 path of vmci_transport_recv_listen() that Sashiko also noted is not introduced or changed by this patch. Tested on lts-6.12.79 with KASAN: 52/100 unpatched -> 0/100 patched.
Timeline
ID reserved
By Linux
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < 1e19f08552b90070ed18bafb1763c78297823af6
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < 1dd531e28f61edd286edc486ab068f135b5ae1eb
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < ecda37f8faab3220da199335e42564cb7a9ad145
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < 47e63077605c6c2aa45b3df9847a8cdc1f1f6ef9
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < 440447699c681e26ed58e9c309cad718270a18b4
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < 9fe74e42914c851d68069713b7b917a9c33faf26
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < 99e22ddf4edb63dc8382bc028af928056d3450cf
- affected 3.9
- unaffected < 3.9
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.142 – ≤ 6.6.*
- unaffected 6.12.92 – ≤ 6.12.*
- unaffected 6.18.34 – ≤ 6.18.*
- unaffected 7.0.11 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References8
- https://git.kernel.org/stable/c/1e19f08552b90070ed18bafb1763c78297823af6 (opens in a new tab)
- https://git.kernel.org/stable/c/1dd531e28f61edd286edc486ab068f135b5ae1eb (opens in a new tab)
- https://git.kernel.org/stable/c/ecda37f8faab3220da199335e42564cb7a9ad145 (opens in a new tab)
- https://git.kernel.org/stable/c/cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb (opens in a new tab)
- https://git.kernel.org/stable/c/47e63077605c6c2aa45b3df9847a8cdc1f1f6ef9 (opens in a new tab)
- https://git.kernel.org/stable/c/440447699c681e26ed58e9c309cad718270a18b4 (opens in a new tab)
- https://git.kernel.org/stable/c/9fe74e42914c851d68069713b7b917a9c33faf26 (opens in a new tab)
- https://git.kernel.org/stable/c/99e22ddf4edb63dc8382bc028af928056d3450cf (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-45800 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64115)Record last updated .