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TI-2025-26059 Aliases CVE-2025-38724GHSA-x8r2-g34h-2v3j

nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()

Priority MEDIUM 43CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 45 fixed, 3 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: nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm() Lei Lu recently reported that nfsd4_setclientid_confirm() did not check the return value from get_client_locked(). a SETCLIENTID_CONFIRM could race with a confirmed client expiring and fail to get a reference. That could later lead to a UAF. Fix this by getting a reference early in the case where there is an extant confirmed client. If that fails then treat it as if there were no confirmed client found at all. In the case where the unconfirmed client is expiring, just fail and return the result from get_client_locked().

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00406 35th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.4.297, 5.10.241, 5.15.190 +6Red Hat: 15 advisoriesRed Hat: 45 fixed, 3 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
LinuxLinux3.17 and later5.4.297, 5.10.241, 5.15.190, 6.1.149, 6.6.103, 6.12.43, 6.15.11, 6.16.2, 6.17Patch availableCNA
  • Linux VendorLinux Affected 3.17 and later Fixed in 5.4.297, 5.10.241, 5.15.190, 6.1.149, 6.6.103, 6.12.43, 6.15.11, 6.16.2, 6.17 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*3.17 to before 5.4.297; 5.5 to before 5.10.241; 5.11 to before 5.15.190; 5.16 to before 6.1.149; 6.2 to before 6.6.103; 6.7 to before 6.12.43; 6.13 to before 6.15.11; 6.16 to before 6.16.2VulnerableLinux
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*11.0VulnerableDebian
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.17 to before 5.4.297; 5.5 to before 5.10.241; 5.11 to before 5.15.190; 5.16 to before 6.1.149; 6.2 to before 6.6.103; 6.7 to before 6.12.43; 6.13 to before 6.15.11; 6.16 to before 6.16.2 Vulnerable ·Linux
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.4.297, 5.10.241, 5.15.190, 6.1.149, 6.6.103, 6.12.43, 6.15.11, 6.16.2, 6.17

Red Hat 15 advisories

  • RHSA-2026:0576 Released 2026-01-14 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.161.1.el9_0, kernel-debug-devel-matched-5.14.0-70.161.1.el9_0, kernel-devel-5.14.0-70.161.1.el9_0 +5
    • Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.161.1.el9_0, kernel-5.14.0-70.161.1.el9_0, kernel-abi-stablelists-5.14.0-70.161.1.el9_0 +14
  • RHSA-2026:0535 Released 2026-01-14 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.152.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.152.1.el9_2, kernel-64k-devel-5.14.0-284.152.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.152.1.el9_2, kernel-5.14.0-284.152.1.el9_2, kernel-64k-5.14.0-284.152.1.el9_2 +29
  • RHSA-2026:0532 Released 2026-01-14 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.124.1.el8_8, kernel-4.18.0-477.124.1.el8_8, kernel-abi-stablelists-4.18.0-477.124.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.124.1.el8_8, kernel-4.18.0-477.124.1.el8_8, kernel-abi-stablelists-4.18.0-477.124.1.el8_8 +14
Show 12 more Red Hat advisories
  • RHSA-2026:0534 Released 2026-01-14 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-core-5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-debug-5.14.0-284.152.1.rt14.437.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-core-5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-debug-5.14.0-284.152.1.rt14.437.el9_2 +11
  • RHSA-2026:0537 Released 2026-01-14 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-core-5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-debug-5.14.0-70.161.1.rt21.233.el9_0 +9
    • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-core-5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-debug-5.14.0-70.161.1.rt21.233.el9_0 +7
  • RHSA-2026:0489 Released 2026-01-13 · Red Hat rating Important
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.106.1.el9_4, libperf-5.14.0-427.106.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.106.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.106.1.el9_4, kernel-64k-devel-5.14.0-427.106.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.106.1.el9_4, kernel-5.14.0-427.106.1.el9_4, kernel-64k-5.14.0-427.106.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.106.1.el9_4, kernel-rt-core-5.14.0-427.106.1.el9_4, kernel-rt-debug-5.14.0-427.106.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.106.1.el9_4, kernel-rt-core-5.14.0-427.106.1.el9_4, kernel-rt-debug-5.14.0-427.106.1.el9_4 +11
  • RHSA-2025:23463 Released 2025-12-17 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.182.1.el8_4, kernel-4.18.0-305.182.1.el8_4, kernel-abi-stablelists-4.18.0-305.182.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.182.1.el8_4, kernel-4.18.0-305.182.1.el8_4, kernel-abi-stablelists-4.18.0-305.182.1.el8_4 +14
  • RHSA-2025:23445 Released 2025-12-17 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) bpftool-4.18.0-193.178.1.el8_2, kernel-4.18.0-193.178.1.el8_2, kernel-abi-whitelists-4.18.0-193.178.1.el8_2 +14
  • RHSA-2025:23000 Released 2025-12-10 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.172.1.el8_6, kernel-4.18.0-372.172.1.el8_6, kernel-abi-stablelists-4.18.0-372.172.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.172.1.el8_6, kernel-4.18.0-372.172.1.el8_6, kernel-abi-stablelists-4.18.0-372.172.1.el8_6 +19
    • Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.172.1.el8_6, kernel-4.18.0-372.172.1.el8_6, kernel-abi-stablelists-4.18.0-372.172.1.el8_6 +14
  • RHSA-2025:22571 Released 2025-12-02 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.47.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.47.1.el10_0, kernel-64k-devel-6.12.0-55.47.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.47.1.el10_0, kernel-64k-6.12.0-55.47.1.el10_0, kernel-64k-core-6.12.0-55.47.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.47.1.el10_0, libperf-6.12.0-55.47.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.47.1.el10_0, kernel-rt-64k-6.12.0-55.47.1.el10_0, kernel-rt-64k-core-6.12.0-55.47.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.47.1.el10_0, kernel-rt-core-6.12.0-55.47.1.el10_0, kernel-rt-debug-6.12.0-55.47.1.el10_0 +11
  • RHSA-2025:22405 Released 2025-12-01 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-611.11.1.el9_7, kernel-64k-debug-devel-matched-5.14.0-611.11.1.el9_7, kernel-64k-devel-5.14.0-611.11.1.el9_7 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-611.11.1.el9_7, kernel-64k-5.14.0-611.11.1.el9_7, kernel-64k-core-5.14.0-611.11.1.el9_7 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-611.11.1.el9_7, libperf-5.14.0-611.11.1.el9_7
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-611.11.1.el9_7, kernel-rt-64k-5.14.0-611.11.1.el9_7, kernel-rt-64k-core-5.14.0-611.11.1.el9_7 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-611.11.1.el9_7, kernel-rt-core-5.14.0-611.11.1.el9_7, kernel-rt-debug-5.14.0-611.11.1.el9_7 +9
  • RHSA-2025:22392 Released 2025-12-01 · Red Hat rating Important
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.69.1.el9_6, libperf-5.14.0-570.69.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.69.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.69.1.el9_6, kernel-64k-devel-5.14.0-570.69.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.69.1.el9_6, kernel-64k-5.14.0-570.69.1.el9_6, kernel-64k-core-5.14.0-570.69.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.69.1.el9_6, kernel-rt-64k-5.14.0-570.69.1.el9_6, kernel-rt-64k-core-5.14.0-570.69.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.69.1.el9_6, kernel-rt-core-5.14.0-570.69.1.el9_6, kernel-rt-debug-5.14.0-570.69.1.el9_6 +11
  • RHSA-2025:22395 Released 2025-12-01 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-124.16.1.el10_1, kernel-64k-debug-devel-matched-6.12.0-124.16.1.el10_1, kernel-64k-devel-6.12.0-124.16.1.el10_1 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-124.16.1.el10_1, kernel-64k-6.12.0-124.16.1.el10_1, kernel-64k-core-6.12.0-124.16.1.el10_1 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-124.16.1.el10_1, libperf-6.12.0-124.16.1.el10_1
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-124.16.1.el10_1, kernel-rt-64k-6.12.0-124.16.1.el10_1, kernel-rt-64k-core-6.12.0-124.16.1.el10_1 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-124.16.1.el10_1, kernel-rt-core-6.12.0-124.16.1.el10_1, kernel-rt-debug-6.12.0-124.16.1.el10_1 +9
  • RHSA-2025:22388 Released 2025-12-01 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.87.1.el8_10, kernel-4.18.0-553.87.1.el8_10, kernel-abi-stablelists-4.18.0-553.87.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.87.1.el8_10
  • RHSA-2025:22387 Released 2025-12-01 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-core-4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-debug-4.18.0-553.87.1.rt7.428.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-core-4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-debug-4.18.0-553.87.1.rt7.428.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 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:0489
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2025:22392
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2025:22395
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:22405
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:0576
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:0535
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2025:22571
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:0489
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2025:22392
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2025:22395
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2025:22388
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2025:22405
Red Hat Enterprise Linux BaseOS AUS (v. 8.2)Fixed RHSA-2025:23445
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2025:23463
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2025:23000
Red Hat Enterprise Linux BaseOS E4S (v.8.6)Fixed RHSA-2025:23000
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:0532
Red Hat Enterprise Linux BaseOS E4S (v.9.0)Fixed RHSA-2026:0576
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:0535
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2025:22571
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2026:0489
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2025:22392
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2025:23463
Red Hat Enterprise Linux BaseOS TUS (v.8.6)Fixed RHSA-2025:23000
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:0532
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2025:22388
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2025:22395
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:22405
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2025:22571
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2025:22387
Red Hat Enterprise Linux NFV E4S (v.9.0)Fixed RHSA-2026:0537
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2025:22387
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2025:22395
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2025:22405
Red Hat Enterprise Linux Real Time E4S (v.9.0)Fixed RHSA-2026:0537
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:0534
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2025:22571
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2026:0489
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2025:22392
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2025:22395
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2025:22405
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:0534
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2025:22571
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2026:0489
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2025:22392

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-38724
  2. 2026-10-03 Alias added: GHSA-x8r2-g34h-2v3j

References

Patch 9

Advisory 2

  • 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

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