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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

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 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 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 ≤ *

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

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
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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

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

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

Link: CVE-2026-80744

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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Weaknesses

No weakness.