Trending
CVE-2026-31665

CVE detail

CVE-2026-31665

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: fix use-after-free in timeout object destroy nft_ct_timeout_obj_destroy() frees the timeout object with kfree() immediately after nf_ct_untimeout(), without waiting for an RCU grace period. Concurrent packet processing on other CPUs may still hold RCU-protected references to the timeout object obtained via rcu_dereference() in nf_ct_timeout_data(). Add an rcu_head to struct nf_ct_timeout and use kfree_rcu() to defer freeing until after an RCU grace period, matching the approach already used in nfnetlink_cttimeout.c. KASAN report: BUG: KASAN: slab-use-after-free in nf_conntrack_tcp_packet+0x1381/0x29d0 Read of size 4 at addr ffff8881035fe19c by task exploit/80 Call Trace: nf_conntrack_tcp_packet+0x1381/0x29d0 nf_conntrack_in+0x612/0x8b0 nf_hook_slow+0x70/0x100 __ip_local_out+0x1b2/0x210 tcp_sendmsg_locked+0x722/0x1580 __sys_sendto+0x2d8/0x320 Allocated by task 75: nft_ct_timeout_obj_init+0xf6/0x290 nft_obj_init+0x107/0x1b0 nf_tables_newobj+0x680/0x9c0 nfnetlink_rcv_batch+0xc29/0xe00 Freed by task 26: nft_obj_destroy+0x3f/0xa0 nf_tables_trans_destroy_work+0x51c/0x5c0 process_one_work+0x2c4/0x5a0

CVSS 7.8 · HighBuzz score 39.9

Buzz score

Why this CVE is surfacing

Buzz score total 39.9

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 24.9 · diversity 15.0 · KEV 0.0 · OTX 0.0 · PoC 0.0

Mention score

24.9

11 evidence mentions in the snapshot

Diversity score

15.0

3 sources across 3 categories

KEV score

0.0

No KEV entry observed

OTX score

0.0

0 OTX pulses

PoC score

0.0

0 repos · best confidence N/A

Best PoC traction

Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions: 0; within the 30d window
Peak daily: 0; highest bucket

Evidence

Source links by recency

Newest mentions first

11 source links · newest first

CVE-2026-31665 netfilter: nft_ct: fix use-after-free in timeout object destroyMicrosoft MSRC
Information published.
vendormsrc.microsoft.comApr 26, 2026, 8:04 AM
https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlcert-portal.siemens.com
No excerpt available.
Vendor Advisorycert-portal.siemens.comApr 24, 2026, 3:16 PM
https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlcert-portal.siemens.com
No excerpt available.
Vendor Advisorycert-portal.siemens.comApr 24, 2026, 3:16 PM
https://git.kernel.org/stable/c/f8dca15a1b190787bbd03285304b569631160edagit.kernel.org
No excerpt available.
Patchgit.kernel.orgApr 24, 2026, 3:16 PM
https://git.kernel.org/stable/c/f16fe84879a5280f05ebbcea593a189ba0f3e79agit.kernel.org
No excerpt available.
Patchgit.kernel.orgApr 24, 2026, 3:16 PM
https://git.kernel.org/stable/c/d0983b48c10d1509fd795c155f8b1e832e1369ffgit.kernel.org
No excerpt available.
Patchgit.kernel.orgApr 24, 2026, 3:16 PM
https://git.kernel.org/stable/c/c581e5c8f2b59158f62efe61c1a3dc36189081ffgit.kernel.org
No excerpt available.
Patchgit.kernel.orgApr 24, 2026, 3:16 PM
https://git.kernel.org/stable/c/c458fc1c278a65ad5381083121d39a479973ebedgit.kernel.org
No excerpt available.
Patchgit.kernel.orgApr 24, 2026, 3:16 PM
https://git.kernel.org/stable/c/b42aca3660dc2627a29a38131597ca610dc451f9git.kernel.org
No excerpt available.
Patchgit.kernel.orgApr 24, 2026, 3:16 PM
https://git.kernel.org/stable/c/aa7cfa16f98f8ec3e6d47c34e1a8c1ae4b9b8b77git.kernel.org
No excerpt available.
Patchgit.kernel.orgApr 24, 2026, 3:16 PM
https://git.kernel.org/stable/c/070abdf1b04325b21a20a2a0c39a2208af107275git.kernel.org
No excerpt available.
Patchgit.kernel.orgApr 24, 2026, 3:16 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars

No public PoC repositories have been matched yet.

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External lookup

Potential internet exposure

Potential exposure only — not proof of vulnerability.Shodan results indicate potentially internet-exposed products, not confirmed vulnerable systems. They do not confirm that any returned system is vulnerable to CVE-2026-31665.

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Product CPE queries

Derived from this CVE's existing NVD CPE 2.3 records; the application, operating-system, or hardware part is retained.

cpe:2.3:o:linux:linux_kernelSearch this product on Shodan

Exact CVE query

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Metadata

Canonical fields

NVD status

Modified

Published

Apr 24, 2026

Modified

Jul 14, 2026

Official record

Authoritative NVD record

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE IDs

Vendor classifications

How this vector reads

CVSS 3.1 base metrics decoded below. This explanation does not recalculate or change the NVD score.

Attack Vector (AV): Local. The attacker needs local access to the vulnerable system.
Attack Complexity (AC): Low. No special conditions beyond the attacker-controlled steps are required.
Privileges Required (PR): Low. The attacker needs basic user-level privileges.
User Interaction (UI): None. Exploitation does not require another user to act.
Scope (S): Unchanged. Impacts remain within the vulnerable security authority.
Confidentiality Impact (C): High. There is a total or serious impact to this security property.
Integrity Impact (I): High. There is a total or serious impact to this security property.
Availability Impact (A): High. There is a total or serious impact to this security property.

Signals

Exploitation indicators

0 stored signals · no KEV · 0 OTX pulses