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TI-2026-45680 Aliases CVE-2026-64115GHSA-c2c8-f8x2-chfh

vsock/vmci: fix UAF when peer resets connection during handshake

Priority LOW 39CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 16 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00135 3rd percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.258, 5.15.209, 6.1.175 +5Red Hat: 4 advisoriesRed Hat: 16 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux3.9 and later5.10.258, 5.15.209, 6.1.175, 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1Patch availableCNA
  • Linux VendorLinux Affected 3.9 and later Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1 Patch available CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*3.9 to before 5.10.258; 5.11 to before 5.15.209; 5.16 to before 6.1.175; 6.2 to before 6.6.142; 6.7 to before 6.12.92; 6.13 to before 6.18.34; 6.19 to before 7.0.11VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*7.1 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*7.1 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*7.1 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*7.1 rc4VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.9 to before 5.10.258; 5.11 to before 5.15.209; 5.16 to before 6.1.175; 6.2 to before 6.6.142; 6.7 to before 6.12.92; 6.13 to before 6.18.34; 6.19 to before 7.0.11 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* Versions 7.1 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* Versions 7.1 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* Versions 7.1 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* Versions 7.1 rc4 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1

Red Hat 4 advisories

  • RHSA-2026:77689 Released 2026-10-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.56.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.56.1.el9_8, kernel-64k-devel-5.14.0-687.56.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.56.1.el9_8, kernel-64k-5.14.0-687.56.1.el9_8, kernel-64k-core-5.14.0-687.56.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.56.1.el9_8, libperf-5.14.0-687.56.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.56.1.el9_8, kernel-rt-64k-5.14.0-687.56.1.el9_8, kernel-rt-64k-core-5.14.0-687.56.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.56.1.el9_8, kernel-rt-core-5.14.0-687.56.1.el9_8, kernel-rt-debug-5.14.0-687.56.1.el9_8 +9
  • RHSA-2026:77690 Released 2026-10-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • 10Base-SMTV kernel-modules-internal-6.12.0-211.64.1.el10_2
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.64.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.64.1.el10_2, kernel-64k-devel-6.12.0-211.64.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.64.1.el10_2, kernel-64k-6.12.0-211.64.1.el10_2, kernel-64k-core-6.12.0-211.64.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.64.1.el10_2, libperf-6.12.0-211.64.1.el10_2
    • Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal-6.12.0-211.64.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.64.1.el10_2, kernel-rt-64k-6.12.0-211.64.1.el10_2, kernel-rt-64k-core-6.12.0-211.64.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.64.1.el10_2, kernel-rt-core-6.12.0-211.64.1.el10_2, kernel-rt-debug-6.12.0-211.64.1.el10_2 +9
  • RHSA-2026:77498 Released 2026-10-08 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.172.1.el8_10, kernel-4.18.0-553.172.1.el8_10, kernel-abi-stablelists-4.18.0-553.172.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.172.1.el8_10
Show 1 more Red Hat advisories
  • RHSA-2026:77500 Released 2026-10-07 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.172.1.rt7.513.el8_10, kernel-rt-core-4.18.0-553.172.1.rt7.513.el8_10, kernel-rt-debug-4.18.0-553.172.1.rt7.513.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.172.1.rt7.513.el8_10, kernel-rt-core-4.18.0-553.172.1.rt7.513.el8_10, kernel-rt-debug-4.18.0-553.172.1.rt7.513.el8_10 +7

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
10Base-SMTVFixed RHSA-2026:77690
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:77690
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:77689
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:77690
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:77498
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:77689
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:77498
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:77690
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:77689
Red Hat Enterprise Linux Hidden (v. 10)Fixed RHSA-2026:77690
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:77500
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:77500
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:77690
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:77689
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:77690
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:77689
Not affected: 1 product
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-64115
  2. 2026-10-03 Alias added: GHSA-c2c8-f8x2-chfh
  3. 2026-10-07 Fix available: RHSA-2026:77500 · Red Hat
  4. 2026-10-07 Fix available: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8) · Red Hat
  5. 2026-10-08 Fix available: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · Red Hat
  6. 2026-10-09 Fix available: RHSA-2026:77498 · Red Hat
  7. 2026-10-09 Fix available: RHSA-2026:77689 · Red Hat
  8. 2026-10-09 Fix available: RHSA-2026:77690 · Red Hat
  9. 2026-10-09 Fix available: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 9) +9 · Red Hat
  10. 2026-10-16 CISA SSVC decision points changed
  11. 2026-10-19 Weakness changed · CISA ADP

References

Patch 8

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences