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TI-2025-26651 Aliases CVE-2025-39979GHSA-52rq-cpwv-rvvm

net/mlx5: fs, fix UAF in flow counter release

Priority LOW 35Published · 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: 10 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: net/mlx5: fs, fix UAF in flow counter release Fix a kernel trace [1] caused by releasing an HWS action of a local flow counter in mlx5_cmd_hws_delete_fte(), where the HWS action refcount and mutex were not initialized and the counter struct could already be freed when deleting the rule. Fix it by adding the missing initializations and adding refcount for the local flow counter struct. [1] Kernel log: Call Trace: <TASK> dump_stack_lvl+0x34/0x48 mlx5_fs_put_hws_action.part.0.cold+0x21/0x94 [mlx5_core] mlx5_fc_put_hws_action+0x96/0xad [mlx5_core] mlx5_fs_destroy_fs_actions+0x8b/0x152 [mlx5_core] mlx5_cmd_hws_delete_fte+0x5a/0xa0 [mlx5_core] del_hw_fte+0x1ce/0x260 [mlx5_core] mlx5_del_flow_rules+0x12d/0x240 [mlx5_core] ? ttwu_queue_wakelist+0xf4/0x110 mlx5_ib_destroy_flow+0x103/0x1b0 [mlx5_ib] uverbs_free_flow+0x20/0x50 [ib_uverbs] destroy_hw_idr_uobject+0x1b/0x50 [ib_uverbs] uverbs_destroy_uobject+0x34/0x1a0 [ib_uverbs] uobj_destroy+0x3c/0x80 [ib_uverbs] ib_uverbs_run_method+0x23e/0x360 [ib_uverbs] ? uverbs_finalize_object+0x60/0x60 [ib_uverbs] ib_uverbs_cmd_verbs+0x14f/0x2c0 [ib_uverbs] ? do_tty_write+0x1a9/0x270 ? file_tty_write.constprop.0+0x98/0xc0 ? new_sync_write+0xfc/0x190 ib_uverbs_ioctl+0xd7/0x160 [ib_uverbs] __x64_sys_ioctl+0x87/0xc0 do_syscall_64+0x59/0x90

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00147 3rd percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.16.10, 6.17Red Hat: 2 advisoriesRed Hat: 10 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
LinuxLinux6.14 and later6.16.10, 6.17Patch availableCNA
  • Linux VendorLinux Affected 6.14 and later Fixed in 6.16.10, 6.17 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.16.10, 6.17

Red Hat 2 advisories

  • RHSA-2025:22865 Released 2025-12-09 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-611.13.1.el9_7, kernel-64k-debug-devel-matched-5.14.0-611.13.1.el9_7, kernel-64k-devel-5.14.0-611.13.1.el9_7 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-611.13.1.el9_7, kernel-64k-5.14.0-611.13.1.el9_7, kernel-64k-core-5.14.0-611.13.1.el9_7 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-611.13.1.el9_7, libperf-5.14.0-611.13.1.el9_7
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-611.13.1.el9_7, kernel-rt-64k-5.14.0-611.13.1.el9_7, kernel-rt-64k-core-5.14.0-611.13.1.el9_7 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-611.13.1.el9_7, kernel-rt-core-5.14.0-611.13.1.el9_7, kernel-rt-debug-5.14.0-611.13.1.el9_7 +9
  • RHSA-2025:22854 Released 2025-12-09 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-124.20.1.el10_1, kernel-64k-debug-devel-matched-6.12.0-124.20.1.el10_1, kernel-64k-devel-6.12.0-124.20.1.el10_1 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-124.20.1.el10_1, kernel-64k-6.12.0-124.20.1.el10_1, kernel-64k-core-6.12.0-124.20.1.el10_1 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-124.20.1.el10_1, libperf-6.12.0-124.20.1.el10_1
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-124.20.1.el10_1, kernel-rt-64k-6.12.0-124.20.1.el10_1, kernel-rt-64k-core-6.12.0-124.20.1.el10_1 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-124.20.1.el10_1, kernel-rt-core-6.12.0-124.20.1.el10_1, kernel-rt-debug-6.12.0-124.20.1.el10_1 +9

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 9AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2025:22854
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:22865
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2025:22854
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2025:22865
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2025:22854
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:22865
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2025:22854
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2025:22865
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2025:22854
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2025:22865
Not affected: 2 products
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-39979
  2. 2026-10-03 Alias added: GHSA-52rq-cpwv-rvvm
  3. 2026-10-16 CISA SSVC decision points changed

References

Other 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-2021-02452 Incorrect authorization in Ubuntu linux kernel 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
See all 21741 →

Sources

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