High severity · published Apr 24, 2026
CVE-2026-31563
net: macb: Use dev_consume_skb_any() to free TX SKBs
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
net: macb: Use dev_consume_skb_any() to free TX SKBs
The napi_consume_skb() function is not intended to be called in an IRQ
disabled context. However, after commit 6bc8a5098bf4 ("net: macb: Fix
tx_ptr_lock locking"), the freeing of TX SKBs is performed with IRQs
disabled. To resolve the following call trace, use dev_consume_skb_any()
for freeing TX SKBs:
WARNING: kernel/softirq.c:430 at __local_bh_enable_ip+0x174/0x188, CPU#0: ksoftirqd/0/15
Modules linked in:
CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 7.0.0-rc4-next-20260319-yocto-standard-dirty #37 PREEMPT
Hardware name: ZynqMP ZCU102 Rev1.1 (DT)
pstate: 200000c5 (nzCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __local_bh_enable_ip+0x174/0x188
lr : local_bh_enable+0x24/0x38
sp : ffff800082b3bb10
x29: ffff800082b3bb10 x28: ffff0008031f3c00 x27: 000000000011ede0
x26: ffff000800a7ff00 x25: ffff800083937ce8 x24: 0000000000017a80
x23: ffff000803243a78 x22: 0000000000000040 x21: 0000000000000000
x20: ffff000800394c80 x19: 0000000000000200 x18: 0000000000000001
x17: 0000000000000001 x16: ffff000803240000 x15: 0000000000000000
x14: ffffffffffffffff x13: 0000000000000028 x12: ffff000800395650
x11: ffff8000821d1528 x10: ffff800081c2bc08 x9 : ffff800081c1e258
x8 : 0000000100000301 x7 : ffff8000810426ec x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000008 x1 : 0000000000000200 x0 : ffff8000810428dc
Call trace:
__local_bh_enable_ip+0x174/0x188 (P)
local_bh_enable+0x24/0x38
skb_attempt_defer_free+0x190/0x1d8
napi_consume_skb+0x58/0x108
macb_tx_poll+0x1a4/0x558
__napi_poll+0x50/0x198
net_rx_action+0x1f4/0x3d8
handle_softirqs+0x16c/0x560
run_ksoftirqd+0x44/0x80
smpboot_thread_fn+0x1d8/0x338
kthread+0x120/0x150
ret_from_fork+0x10/0x20
irq event stamp: 29751
hardirqs last enabled at (29750): [<ffff8000813be184>] _raw_spin_unlock_irqrestore+0x44/0x88
hardirqs last disabled at (29751): [<ffff8000813bdf60>] _raw_spin_lock_irqsave+0x38/0x98
softirqs last enabled at (29150): [<ffff8000800f1aec>] handle_softirqs+0x504/0x560
softirqs last disabled at (29153): [<ffff8000800f2fec>] run_ksoftirqd+0x44/0x80
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
6.1.151 before 6.1.168; 6.6.105 before 6.6.131; 6.12.46 before 6.12.80; 6.16.6 before 6.17; 6.17.1 before 6.18.21; 6.19 before 6.19.11; +8 more · source: NVD
LI
Linux · Linux
aeeafeb29b1b270302a9a85a13f7d70a68a3b9e6 before 92e7081f0c79d9073087e54bab745bb184192c2e; 5430388a81113e62a2d48b5d7dc1e76231908ebf before 78c8b090a3d5c1689dc989861b0163180db2b3f8; 7db8aa3fc4ed0a2928246747b2514b0741a8187e before 984350b37372f79f71d4f0a5264c640e40daf9ce; 6bc8a5098bf4a365c4086a4a4130bfab10a58260 before f4bc91398b579730284328322365afa77a9d568f; 6bc8a5098bf4a365c4086a4a4130bfab10a58260 before ca4d05afb4683d685bb2c6fccae4386c478f524a; 6bc8a5098bf4a365c4086a4a4130bfab10a58260 before 647b8a2fe474474704110db6bd07f7a139e621eb; +6 more · source: vendor
SS
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7; V3.1.6; V3.1.5; V3.1.7 · source: CISA
SS
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7; V3.1.6; V3.1.5; V3.1.7 · source: CISA
SS
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-31563
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-31563
Patch
https://git.kernel.org/stable/c/647b8a2fe474474704110db6bd07f7a139e621eb
Patch
https://git.kernel.org/stable/c/78c8b090a3d5c1689dc989861b0163180db2b3f8
Patch
https://git.kernel.org/stable/c/92e7081f0c79d9073087e54bab745bb184192c2e
Patch
https://git.kernel.org/stable/c/984350b37372f79f71d4f0a5264c640e40daf9ce
Patch
https://git.kernel.org/stable/c/ca4d05afb4683d685bb2c6fccae4386c478f524a
Patch
https://git.kernel.org/stable/c/f4bc91398b579730284328322365afa77a9d568f
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