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TI-2026-38087 Aliases CVE-2026-53000GHSA-6794-4vqv-w8qg

netfilter: nat: use kfree_rcu to release ops

Priority LOW 35CWE-763Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 23 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nat: use kfree_rcu to release ops Florian Westphal says: "Historically this is not an issue, even for normal base hooks: the data path doesn't use the original nf_hook_ops that are used to register the callbacks. However, in v5.14 I added the ability to dump the active netfilter hooks from userspace. This code will peek back into the nf_hook_ops that are available at the tail of the pointer-array blob used by the datapath. The nat hooks are special, because they are called indirectly from the central nat dispatcher hook. They are currently invisible to the nfnl hook dump subsystem though. But once that changes the nat ops structures have to be deferred too." Update nf_nat_register_fn() to deal with partial exposition of the hooks from error path which can be also an issue for nfnetlink_hook.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00183 7th percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.1.191, 6.6.160, 6.12.114 +3Red Hat: 6 advisoriesRed Hat: 23 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
LinuxLinux5.14 and later6.1.191, 6.6.160, 6.12.114, 6.18.33, 7.0.10, 7.1Patch availableCNA
  • Linux VendorLinux Affected 5.14 and later Fixed in 6.1.191, 6.6.160, 6.12.114, 6.18.33, 7.0.10, 7.1 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*5.14 to before 6.18.33; 6.19 to before 7.0.10VulnerableLinux
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*9.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*10.0VulnerableRed Hat
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.14 to before 6.18.33; 6.19 to before 7.0.10 Vulnerable ·Linux
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Red Hat

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.191, 6.6.160, 6.12.114, 6.18.33, 7.0.10, 7.1

Red Hat 6 advisories

  • RHSA-2026:70482 Released 2026-09-23 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.193.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.193.1.el9_2, kernel-64k-devel-5.14.0-284.193.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.193.1.el9_2, kernel-5.14.0-284.193.1.el9_2, kernel-64k-5.14.0-284.193.1.el9_2 +29
  • RHSA-2026:70483 Released 2026-09-23 · Red Hat rating Important
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.193.1.rt14.478.el9_2, kernel-rt-core-5.14.0-284.193.1.rt14.478.el9_2, kernel-rt-debug-5.14.0-284.193.1.rt14.478.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.193.1.rt14.478.el9_2, kernel-rt-core-5.14.0-284.193.1.rt14.478.el9_2, kernel-rt-debug-5.14.0-284.193.1.rt14.478.el9_2 +11
  • RHSA-2026:68100 Released 2026-09-16 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) kernel-64k-debug-devel-5.14.0-427.150.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.150.1.el9_4, kernel-64k-devel-5.14.0-427.150.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool-7.3.0-427.150.1.el9_4, kernel-5.14.0-427.150.1.el9_4, kernel-64k-5.14.0-427.150.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt-5.14.0-427.150.1.el9_4, kernel-rt-core-5.14.0-427.150.1.el9_4, kernel-rt-debug-5.14.0-427.150.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt-5.14.0-427.150.1.el9_4, kernel-rt-core-5.14.0-427.150.1.el9_4, kernel-rt-debug-5.14.0-427.150.1.el9_4 +11
Show 3 more Red Hat advisories
  • RHSA-2026:67720 Released 2026-09-16 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.141.1.el9_6, libperf-5.14.0-570.141.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.141.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.141.1.el9_6, kernel-64k-devel-5.14.0-570.141.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.141.1.el9_6, kernel-64k-5.14.0-570.141.1.el9_6, kernel-64k-core-5.14.0-570.141.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.141.1.el9_6, kernel-rt-64k-5.14.0-570.141.1.el9_6, kernel-rt-64k-core-5.14.0-570.141.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.141.1.el9_6, kernel-rt-core-5.14.0-570.141.1.el9_6, kernel-rt-debug-5.14.0-570.141.1.el9_6 +11
  • RHSA-2026:64808 Released 2026-09-08 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.45.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.45.1.el9_8, kernel-64k-devel-5.14.0-687.45.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.45.1.el9_8, kernel-64k-5.14.0-687.45.1.el9_8, kernel-64k-core-5.14.0-687.45.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.45.1.el9_8, libperf-5.14.0-687.45.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.45.1.el9_8, kernel-rt-64k-5.14.0-687.45.1.el9_8, kernel-rt-64k-core-5.14.0-687.45.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.45.1.el9_8, kernel-rt-core-5.14.0-687.45.1.el9_8, kernel-rt-debug-5.14.0-687.45.1.el9_8 +9
  • RHSA-2026:55445 Released 2026-08-17 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.98.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.98.1.el10_0, kernel-64k-devel-6.12.0-55.98.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.98.1.el10_0, kernel-64k-6.12.0-55.98.1.el10_0, kernel-64k-core-6.12.0-55.98.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.98.1.el10_0, libperf-6.12.0-55.98.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.98.1.el10_0, kernel-rt-64k-6.12.0-55.98.1.el10_0, kernel-rt-64k-core-6.12.0-55.98.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.98.1.el10_0, kernel-rt-core-6.12.0-55.98.1.el10_0, kernel-rt-debug-6.12.0-55.98.1.el10_0 +11

Vendor assessments

Red Hat

Red Hat rating: Important. 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.9.6)Fixed RHSA-2026:67720
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:64808
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:70482
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:68100
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:55445
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:67720
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:64808
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:70482
Red Hat Enterprise Linux BaseOS E4S (v.9.4)Fixed RHSA-2026:68100
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:55445
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:67720
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:64808
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:55445
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:64808
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:70483
Red Hat Enterprise Linux Real Time E4S (v.9.4)Fixed RHSA-2026:68100
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:55445
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:67720
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:64808
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:70483
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)Fixed RHSA-2026:68100
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:55445
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:67720
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-2026-53000
  2. 2026-10-03 Alias added: GHSA-6794-4vqv-w8qg
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-19 Weakness changed · CISA ADP
  5. 2026-10-21 Fix available: Linux/Linux@050f98e56782b14677c5bae50800e60775bbf6bb, Linux/[email protected], Linux/[email protected] +1 · CNA
  6. 2026-10-21 2 new references · CNA
  7. 2026-10-30 Fix available: Linux/[email protected], Linux/Linux@bf17f1d3b307196d9282c4b1dd8be0d0e5f8e529 · CNA
  8. 2026-10-30 1 new reference · CNA

References

Patch 3

Advisory 3

Other 3

  • 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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