Read the docs
TI-2026-18503 Aliases CVE-2026-23066GHSA-rx25-rppp-x99w

rxrpc: Fix recvmsg() unconditional requeue

Priority LOW 35CWE-362Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 19 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-674.

Summary

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix recvmsg() unconditional requeue If rxrpc_recvmsg() fails because MSG_DONTWAIT was specified but the call at the front of the recvmsg queue already has its mutex locked, it requeues the call - whether or not the call is already queued. The call may be on the queue because MSG_PEEK was also passed and so the call was not dequeued or because the I/O thread requeued it. The unconditional requeue may then corrupt the recvmsg queue, leading to things like UAFs or refcount underruns. Fix this by only requeuing the call if it isn't already on the queue - and moving it to the front if it is already queued. If we don't queue it, we have to put the ref we obtained by dequeuing it. Also, MSG_PEEK doesn't dequeue the call so shouldn't call rxrpc_notify_socket() for the call if we didn't use up all the data on the queue, so fix that also.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00122 1st percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.258, 5.15.209, 6.1.175 +4Red Hat: 5 advisoriesRed Hat: 19 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
LinuxLinux4.11 and later5.10.258, 5.15.209, 6.1.175, 6.6.130, 6.12.78, 6.18.8, 6.19Patch availableCNA
  • Linux VendorLinux Affected 4.11 and later Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.130, 6.12.78, 6.18.8, 6.19 Patch available CNA

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*4.11 to before 6.18.8VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*6.19 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*6.19 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*6.19 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*6.19 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*6.19 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*6.19 rc6VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.11 to before 6.18.8 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* Versions 6.19 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:* Versions 6.19 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:* Versions 6.19 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:* Versions 6.19 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:* Versions 6.19 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:* Versions 6.19 rc6 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.130, 6.12.78, 6.18.8, 6.19

Red Hat 5 advisories

  • RHSA-2026:10108 Released 2026-04-23 · Red Hat rating Important
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.121.1.el9_4, libperf-5.14.0-427.121.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.121.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.121.1.el9_4, kernel-64k-devel-5.14.0-427.121.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.121.1.el9_4, kernel-5.14.0-427.121.1.el9_4, kernel-64k-5.14.0-427.121.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.121.1.el9_4, kernel-rt-core-5.14.0-427.121.1.el9_4, kernel-rt-debug-5.14.0-427.121.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.121.1.el9_4, kernel-rt-core-5.14.0-427.121.1.el9_4, kernel-rt-debug-5.14.0-427.121.1.el9_4 +11
  • RHSA-2026:9644 Released 2026-04-22 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.166.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.166.1.el9_2, kernel-64k-devel-5.14.0-284.166.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.166.1.el9_2, kernel-5.14.0-284.166.1.el9_2, kernel-64k-5.14.0-284.166.1.el9_2 +29
  • RHSA-2026:9512 Released 2026-04-22 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.166.1.rt14.451.el9_2, kernel-rt-core-5.14.0-284.166.1.rt14.451.el9_2, kernel-rt-debug-5.14.0-284.166.1.rt14.451.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.166.1.rt14.451.el9_2, kernel-rt-core-5.14.0-284.166.1.rt14.451.el9_2, kernel-rt-debug-5.14.0-284.166.1.rt14.451.el9_2 +11
Show 2 more Red Hat advisories
  • RHSA-2026:9112 Released 2026-04-20 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.108.1.el9_6, libperf-5.14.0-570.108.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.108.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.108.1.el9_6, kernel-64k-devel-5.14.0-570.108.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.108.1.el9_6, kernel-64k-5.14.0-570.108.1.el9_6, kernel-64k-core-5.14.0-570.108.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.108.1.el9_6, kernel-rt-64k-5.14.0-570.108.1.el9_6, kernel-rt-64k-core-5.14.0-570.108.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.108.1.el9_6, kernel-rt-core-5.14.0-570.108.1.el9_6, kernel-rt-debug-5.14.0-570.108.1.el9_6 +11
  • RHSA-2026:9095 Released 2026-04-20 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.69.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.69.1.el10_0, kernel-64k-devel-6.12.0-55.69.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.69.1.el10_0, kernel-64k-6.12.0-55.69.1.el10_0, kernel-64k-core-6.12.0-55.69.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.69.1.el10_0, libperf-6.12.0-55.69.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.69.1.el10_0, kernel-rt-64k-6.12.0-55.69.1.el10_0, kernel-rt-64k-core-6.12.0-55.69.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.69.1.el10_0, kernel-rt-core-6.12.0-55.69.1.el10_0, kernel-rt-debug-6.12.0-55.69.1.el10_0 +11

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:10108
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:9112
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:9644
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:9095
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:10108
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:9112
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:9644
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:9095
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2026:10108
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:9112
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:9095
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:9512
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:9095
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2026:10108
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:9112
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:9512
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:9095
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2026:10108
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:9112
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23066
  2. 2026-10-03 Alias added: GHSA-rx25-rppp-x99w
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-19 Weakness changed · CISA ADP

References

Patch 2

Other 5

  • 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