CVE-2026-80744 - Vulnerability Details

- netfilter: nf_tables_offload: suppress WARN_ON_ONCE for ENOMEM in abort path

Description

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_tables_offload: suppress WARN_ON_ONCE for ENOMEM in abort path

In nft_flow_rule_offload_abort(), WARN_ON_ONCE(err) is triggered on every
error during rollback, including -ENOMEM. Memory allocation failures are
expected under low-memory conditions and do not indicate a kernel bug.

Trace for example:
nft_flow_offload_chain() // FLOW_BLOCK_BIND
nft_flow_block_chain()
nft_chain_offload_cmd()
nft_block_offload_cmd()
->ndo_setup_tc()
nsim_setup_tc()
flow_block_cb_setup_simple()
flow_block_cb_alloc() // fails to -ENOMEM

The warning was reproduced on the 5.10 stable kernel under memory pressure
via fault injection, but the underlying bug exists in mainline as well,
as demonstrated by the ENOMEM trace above. The following splat was
triggered during nf_tables transaction processing:

WARNING: CPU: 0 PID: 8567 at net/netfilter/nf_tables_offload.c:532 nft_flow_rule_offload_abort net/netfilter/nf_tables_offload.c:532 [inline]
WARNING: CPU: 0 PID: 8567 at net/netfilter/nf_tables_offload.c:532 nft_flow_rule_offload_commit+0x971/0xcd0 net/netfilter/nf_tables_offload.c:591
Modules linked in:
CPU: 0 PID: 8567 Comm: syz-executor.0 Not tainted 5.10.260-syzkaller #0
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:nft_flow_rule_offload_abort net/netfilter/nf_tables_offload.c:532 [inline]
RIP: 0010:nft_flow_rule_offload_commit+0x971/0xcd0 net/netfilter/nf_tables_offload.c:591
Call Trace:
nf_tables_commit+0x3bd/0x4bd0 net/netfilter/nf_tables_api.c:8604
nfnetlink_rcv_batch+0xb1e/0x1f20 net/netfilter/nfnetlink.c:509
nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:579 [inline]
nfnetlink_rcv+0x3b3/0x420 net/netfilter/nfnetlink.c:597
netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
netlink_unicast+0x6cd/0xa00 net/netfilter/af_netlink.c:1340
netlink_sendmsg+0x906/0xe10 net/netfilter/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:651 [inline]
__sock_sendmsg+0x155/0x190 net/socket.c:663
____sys_sendmsg+0x705/0x870 net/socket.c:2379
___sys_sendmsg+0x100/0x170 net/socket.c:2433
__sys_sendmsg+0xe9/0x1c0 net/socket.c:2462
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x67/0xd1

Change the condition to WARN_ON_ONCE(err && err != -ENOMEM) so that
warnings are only emitted for unexpected errors. This aligns with the
common kernel practice of not warning on -ENOMEM.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Published: 2026-09-03

Score: n/a

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The Linux kernel’s nf_tables_offload module incorrectly emitted WARN_ON_ONCE messages for every error during transaction abort, including the expected -ENOMEM error when memory allocation fails. This caused unnecessary warning logs that could obscure real issues but did not create a security vulnerability or an exploitable code path. The patch changes the condition to WARN_ON_ONCE(err && err != -ENOMEM), suppressing these benign warnings while preserving warnings for unexpected errors.

Affected Systems

All Linux kernel installations that include the nf_tables_offload component are affected, notably the 5.10 stable release and later mainline kernels where the bug exists in the nf_tables transaction processing code. The issue is present in any kernel with the nf_tables_offload implementation regardless of distribution, as it was discovered during system testing under low‑memory conditions.

Risk and Exploitability

The risk of this defect is low; there is no direct attack vector or escalation of privileges. EPSS data is unavailable and the vulnerability is not listed in the CISA KEV catalog. The bug merely produces spurious warning logs; it does not affect kernel integrity, confidentiality, or availability. Security teams should treat it as a non‑security bug, though ensuring the patch is in place eliminates potential confusion during troubleshooting.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`63b48c73ff567bbab1f940d6e8f3f48607077a13`	affected	< 2319033c4bf8bdb275a9e4e1f7af9bf8a457ad79
`63b48c73ff567bbab1f940d6e8f3f48607077a13`	affected	< 6ee3803c22b72508c5baf1e5aecb21301b714be0
`63b48c73ff567bbab1f940d6e8f3f48607077a13`	affected	< 09bda4b6df222fd1819e8f188c3a6e90caf546d3
`63b48c73ff567bbab1f940d6e8f3f48607077a13`	affected	< 17c132e18ca5d1641ddbaed8d0e6ecfd1d38fa0b
`63b48c73ff567bbab1f940d6e8f3f48607077a13`	affected	< 7ce9851be6f2b019e96e105a9de99715aec6deb4
`63b48c73ff567bbab1f940d6e8f3f48607077a13`	affected	< 4a923fe60939a194777bc605036ce2147ab00c9d
`63b48c73ff567bbab1f940d6e8f3f48607077a13`	affected	< c23620a0fa5b1d80399f894c41a9f78bc29d6235
`63b48c73ff567bbab1f940d6e8f3f48607077a13`	affected	< d02f592064347e0c1e0d84f24941ad338838cc48

Linux

affected

Version	Status	Constraints
`5.5`	affected	—
`0`	unaffected	< 5.5
`5.10.266`	unaffected	≤ 5.10.*
`5.15.217`	unaffected	≤ 5.15.*
`6.1.184`	unaffected	≤ 6.1.*
`6.6.153`	unaffected	≤ 6.6.*
`6.12.105`	unaffected	≤ 6.12.*
`6.18.46`	unaffected	≤ 6.18.*
`7.1.10`	unaffected	≤ 7.1.*
`7.2`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[63b48c73ff567bbab1f940d6e8f3f48607077a13,2319033c4bf8bdb275a9e4e1f7af9bf8a457ad79)`	affected	code_commit	—
`[63b48c73ff567bbab1f940d6e8f3f48607077a13,4a923fe60939a194777bc605036ce2147ab00c9d)`	affected	code_commit	—
`[63b48c73ff567bbab1f940d6e8f3f48607077a13,6ee3803c22b72508c5baf1e5aecb21301b714be0)`	affected	code_commit	—
`[63b48c73ff567bbab1f940d6e8f3f48607077a13,09bda4b6df222fd1819e8f188c3a6e90caf546d3)`	affected	code_commit	—
`[63b48c73ff567bbab1f940d6e8f3f48607077a13,17c132e18ca5d1641ddbaed8d0e6ecfd1d38fa0b)`	affected	code_commit	—
`[63b48c73ff567bbab1f940d6e8f3f48607077a13,7ce9851be6f2b019e96e105a9de99715aec6deb4)`	affected	code_commit	—
`[63b48c73ff567bbab1f940d6e8f3f48607077a13,c23620a0fa5b1d80399f894c41a9f78bc29d6235)`	affected	code_commit	—
`[63b48c73ff567bbab1f940d6e8f3f48607077a13,d02f592064347e0c1e0d84f24941ad338838cc48)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[5.5,5.5]`	affected	generic	—
`[0,5.5)`	unaffected	generic	—
`[5.10.266,5.10.*]`	unaffected	generic	—
`[5.15.217,5.15.*]`	unaffected	generic	—
`[6.1.184,6.1.*]`	unaffected	generic	—
`[6.6.153,6.6.*]`	unaffected	generic	—
`[6.12.105,6.12.*]`	unaffected	generic	—
`[6.18.46,6.18.*]`	unaffected	generic	—
`[7.1.10,7.1.*]`	unaffected	generic	—
`[0,*]`	unaffected	generic	—

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Upgrade the kernel to a version that includes the nf_tables_offload warning suppression patch (e.g., 5.10.261 or later, or the latest mainline).
If upgrading immediately is not possible, modify system logging configuration (e.g., rsyslog or journald) to filter out WARN_ON_ONCE messages containing "ENOMEM" from nf_tables_offload to reduce log noise.
Continuously review nf_tables transaction logs for genuine errors that may be masked after filtering and investigate any unexpected failures promptly.

Generated by OpenCVE AI on September 3, 2026 at 12:57 UTC.

Tracking

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Advisories

No advisories yet.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00226.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/09bda4b6df222fd1819e8f188c3a6e90caf546d3
https://git.kernel.org/stable/c/17c132e18ca5d1641ddbaed8d0e6ecfd1d38fa0b
https://git.kernel.org/stable/c/2319033c4bf8bdb275a9e4e1f7af9bf8a457ad79
https://git.kernel.org/stable/c/4a923fe60939a194777bc605036ce2147ab00c9d
https://git.kernel.org/stable/c/6ee3803c22b72508c5baf1e5aecb21301b714be0
https://git.kernel.org/stable/c/7ce9851be6f2b019e96e105a9de99715aec6deb4
https://git.kernel.org/stable/c/c23620a0fa5b1d80399f894c41a9f78bc29d6235
https://git.kernel.org/stable/c/d02f592064347e0c1e0d84f24941ad338838cc48

History

Thu, 03 Sep 2026 13:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-390

Thu, 03 Sep 2026 07:30:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables_offload: suppress WARN_ON_ONCE for ENOMEM in abort path In nft_flow_rule_offload_abort(), WARN_ON_ONCE(err) is triggered on every error during rollback, including -ENOMEM. Memory allocation failures are expected under low-memory conditions and do not indicate a kernel bug. Trace for example: nft_flow_offload_chain() // FLOW_BLOCK_BIND nft_flow_block_chain() nft_chain_offload_cmd() nft_block_offload_cmd() ->ndo_setup_tc() nsim_setup_tc() flow_block_cb_setup_simple() flow_block_cb_alloc() // fails to -ENOMEM The warning was reproduced on the 5.10 stable kernel under memory pressure via fault injection, but the underlying bug exists in mainline as well, as demonstrated by the ENOMEM trace above. The following splat was triggered during nf_tables transaction processing: WARNING: CPU: 0 PID: 8567 at net/netfilter/nf_tables_offload.c:532 nft_flow_rule_offload_abort net/netfilter/nf_tables_offload.c:532 [inline] WARNING: CPU: 0 PID: 8567 at net/netfilter/nf_tables_offload.c:532 nft_flow_rule_offload_commit+0x971/0xcd0 net/netfilter/nf_tables_offload.c:591 Modules linked in: CPU: 0 PID: 8567 Comm: syz-executor.0 Not tainted 5.10.260-syzkaller #0 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:nft_flow_rule_offload_abort net/netfilter/nf_tables_offload.c:532 [inline] RIP: 0010:nft_flow_rule_offload_commit+0x971/0xcd0 net/netfilter/nf_tables_offload.c:591 Call Trace: nf_tables_commit+0x3bd/0x4bd0 net/netfilter/nf_tables_api.c:8604 nfnetlink_rcv_batch+0xb1e/0x1f20 net/netfilter/nfnetlink.c:509 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:579 [inline] nfnetlink_rcv+0x3b3/0x420 net/netfilter/nfnetlink.c:597 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x6cd/0xa00 net/netfilter/af_netlink.c:1340 netlink_sendmsg+0x906/0xe10 net/netfilter/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] __sock_sendmsg+0x155/0x190 net/socket.c:663 ____sys_sendmsg+0x705/0x870 net/socket.c:2379 ___sys_sendmsg+0x100/0x170 net/socket.c:2433 __sys_sendmsg+0xe9/0x1c0 net/socket.c:2462 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 Change the condition to WARN_ON_ONCE(err && err != -ENOMEM) so that warnings are only emitted for unexpected errors. This aligns with the common kernel practice of not warning on -ENOMEM. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Title		netfilter: nf_tables_offload: suppress WARN_ON_ONCE for ENOMEM in abort path
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/09bda4b6df222fd1819e8f188c3a6e90caf546d3 https://git.kernel.org/stable/c/17c132e18ca5d1641ddbaed8d0e6ecfd1d38fa0b https://git.kernel.org/stable/c/2319033c4bf8bdb275a9e4e1f7af9bf8a457ad79 https://git.kernel.org/stable/c/4a923fe60939a194777bc605036ce2147ab00c9d https://git.kernel.org/stable/c/6ee3803c22b72508c5baf1e5aecb21301b714be0 https://git.kernel.org/stable/c/7ce9851be6f2b019e96e105a9de99715aec6deb4 https://git.kernel.org/stable/c/c23620a0fa5b1d80399f894c41a9f78bc29d6235 https://git.kernel.org/stable/c/d02f592064347e0c1e0d84f24941ad338838cc48

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-09-03T08:26:27.137Z

Updated: 2026-09-03T08:26:27.137Z

Reserved: 2026-08-26T14:34:25.790Z

Link: CVE-2026-80744

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-09-03T13:06:13.730

Modified: 2026-09-03T13:06:13.730

Link: CVE-2026-80744

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-09-03T13:15:04Z

Weaknesses

CWE-390
Detection of Error Condition Without Action

Impact

Affected Systems

Risk and Exploitability

Tracking

Subscriptions

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