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Linux Kernel CVE-2026-31508

| EUVDEUVD-2026-24887 HIGH
2026-04-22 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Information Disclosure Linux Dell Canonical
7.8
CVSS 3.1 · Vendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Severity by source

Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
7.0 HIGH
qualitative

Primary rating from Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67).

CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

8
Re-analysis Queued
Apr 28, 2026 - 15:07 vuln.today
cvss_changed
Patch released
Apr 28, 2026 - 15:04 nvd
Patch available
Analysis Generated
Apr 27, 2026 - 15:25 vuln.today
CVSS changed
Apr 27, 2026 - 15:22 NVD
7.8 (HIGH)
Patch available
Apr 22, 2026 - 16:33 EUVD
EUVD ID Assigned
Apr 22, 2026 - 14:22 euvd
EUVD-2026-24887
Analysis Generated
Apr 22, 2026 - 14:22 vuln.today
CVE Published
Apr 22, 2026 - 14:16 nvd
HIGH 7.8

DescriptionCVE.org

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

net: openvswitch: Avoid releasing netdev before teardown completes

The patch cited in the Fixes tag below changed the teardown code for OVS ports to no longer unconditionally take the RTNL. After this change, the netdev_destroy() callback can proceed immediately to the call_rcu() invocation if the IFF_OVS_DATAPATH flag is already cleared on the netdev.

The ovs_netdev_detach_dev() function clears the flag before completing the unregistration, and if it gets preempted after clearing the flag (as can happen on an -rt kernel), netdev_destroy() can complete and the device can be freed before the unregistration completes. This leads to a splat like:

[ 998.393867] Oops: general protection fault, probably for non-canonical address 0xff00000001000239: 0000 [#1] SMP PTI [ 998.393877] CPU: 42 UID: 0 PID: 55177 Comm: ip Kdump: loaded Not tainted 6.12.0-211.1.1.el10_2.x86_64+rt #1 PREEMPT_RT [ 998.393886] Hardware name: Dell Inc. PowerEdge R740/0JMK61, BIOS 2.24.0 03/27/2025 [ 998.393889] RIP: 0010:dev_set_promiscuity+0x8d/0xa0 [ 998.393901] Code: 00 00 75 d8 48 8b 53 08 48 83 ba b0 02 00 00 00 75 ca 48 83 c4 08 5b c3 cc cc cc cc 48 83 bf 48 09 00 00 00 75 91 48 8b 47 08 <48> 83 b8 b0 02 00 00 00 74 97 eb 81 0f 1f 80 00 00 00 00 90 90 90 [ 998.393906] RSP: 0018:ffffce5864a5f6a0 EFLAGS: 00010246 [ 998.393912] RAX: ff00000000ffff89 RBX: ffff894d0adf5a05 RCX: 0000000000000000 [ 998.393917] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff894d0adf5a05 [ 998.393921] RBP: ffff894d19252000 R08: ffff894d19252000 R09: 0000000000000000 [ 998.393924] R10: ffff894d19252000 R11: ffff894d192521b8 R12: 0000000000000006 [ 998.393927] R13: ffffce5864a5f738 R14: 00000000ffffffe2 R15: 0000000000000000 [ 998.393931] FS: 00007fad61971800(0000) GS:ffff894cc0140000(0000) knlGS:0000000000000000 [ 998.393936] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 998.393940] CR2: 000055df0a2a6e40 CR3: 000000011c7fe003 CR4: 00000000007726f0 [ 998.393944] PKRU: 55555554 [ 998.393946] Call Trace: [ 998.393949] <TASK> [ 998.393952] ? show_trace_log_lvl+0x1b0/0x2f0 [ 998.393961] ? show_trace_log_lvl+0x1b0/0x2f0 [ 998.393975] ? dp_device_event+0x41/0x80 [openvswitch] [ 998.394009] ? __die_body.cold+0x8/0x12 [ 998.394016] ? die_addr+0x3c/0x60 [ 998.394027] ? exc_general_protection+0x16d/0x390 [ 998.394042] ? asm_exc_general_protection+0x26/0x30 [ 998.394058] ? dev_set_promiscuity+0x8d/0xa0 [ 998.394066] ? ovs_netdev_detach_dev+0x3a/0x80 [openvswitch] [ 998.394092] dp_device_event+0x41/0x80 [openvswitch] [ 998.394102] notifier_call_chain+0x5a/0xd0 [ 998.394106] unregister_netdevice_many_notify+0x51b/0xa60 [ 998.394110] rtnl_dellink+0x169/0x3e0 [ 998.394121] ? rt_mutex_slowlock.constprop.0+0x95/0xd0 [ 998.394125] rtnetlink_rcv_msg+0x142/0x3f0 [ 998.394128] ? avc_has_perm_noaudit+0x69/0xf0 [ 998.394130] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 998.394132] netlink_rcv_skb+0x50/0x100 [ 998.394138] netlink_unicast+0x292/0x3f0 [ 998.394141] netlink_sendmsg+0x21b/0x470 [ 998.394145] ____sys_sendmsg+0x39d/0x3d0 [ 998.394149] ___sys_sendmsg+0x9a/0xe0 [ 998.394156] __sys_sendmsg+0x7a/0xd0 [ 998.394160] do_syscall_64+0x7f/0x170 [ 998.394162] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 998.394165] RIP: 0033:0x7fad61bf4724 [ 998.394188] Code: 89 02 b8 ff ff ff ff eb bb 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 80 3d c5 e9 0c 00 00 74 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89 [ 998.394189] RSP: 002b:00007ffd7e2f7cb8 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 998.394191] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fad61bf4724 [ 998.394193] RDX: 0000000000000000 RSI: 00007ffd7e2f7d20 RDI: 0000000000000003 [ 998.394194] RBP: 00007ffd7e2f7d90 R08: 0000000000000010 R09: 000000000000003f [ 998.394195] R10: 000055df11558010 R11: 0000000000000202 R12: 00007ffd7e2 ---truncated---

AnalysisAI

Use-after-free in Linux kernel Open vSwitch module causes system crash when deleting network interfaces on PREEMPT_RT kernels. The vulnerability is confirmed patched in multiple stable kernel versions (5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11, 7.0) with upstream fixes available via kernel.org commits. EPSS score of 0.02% (7th percentile) indicates very low exploitation likelihood. No active exploitation confirmed (not in CISA KEV). Local authenticated access required (CVSS AV:L/PR:L) with high impact (CVSS 7.8), but exploitation depends on PREEMPT_RT kernel configuration and specific Open vSwitch teardown race conditions.

Technical ContextAI

This is a race condition vulnerability in the Linux kernel's Open vSwitch (OVS) network virtualization subsystem, specifically in the netdev teardown path. The bug was introduced when OVS port teardown code was modified to conditionally use RTNL locking. In ovs_netdev_detach_dev(), the IFF_OVS_DATAPATH flag is cleared on the network device before unregistration completes. On PREEMPT_RT kernels (real-time Linux), preemption can occur after flag clearing, allowing netdev_destroy() to proceed immediately to call_rcu() and free the device while unregistration is still in progress. When the teardown code subsequently calls dev_set_promiscuity() on the freed netdev structure, it triggers a general protection fault accessing invalid memory (0xff00000001000239). The vulnerability affects the net/openvswitch subsystem interaction with core networking device management code. The affected versions span from commit 5498227676303e3ffa9a3a46214af96bc3e81314 through multiple stable kernel branches before respective patches were applied.

RemediationAI

Upgrade to patched Linux kernel versions: 5.10.253 or later for 5.10.x branch, 5.15.203 or later for 5.15.x, 6.1.168 or later for 6.1.x, 6.6.131 or later for 6.6.x, 6.12.80 or later for 6.12.x, 6.18.21 or later for 6.18.x, 6.19.11 or later for 6.19.x, or 7.0 for mainline. Upstream patches are available at https://git.kernel.org/stable/c/33609454be4f582e686a4bf13d4482a5ca0f6c4b and related commits listed in references. For systems that cannot immediately patch, specific compensating controls include: (1) Avoid using PREEMPT_RT kernel configurations if real-time performance is not required (trade-off: loss of deterministic latency guarantees); (2) Minimize dynamic OVS port deletion operations during production workloads, instead performing network topology changes during maintenance windows (trade-off: reduced operational flexibility); (3) If using Open vSwitch on RT kernels, implement monitoring for kernel panics and general protection faults in the dev_set_promiscuity path to detect exploitation attempts (detection only, not prevention). Note that disabling Open vSwitch entirely eliminates the vulnerability but breaks network virtualization functionality for containers and VMs. Vendor advisories are available from Dell and Canonical per the tags.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2026-31508 vulnerability details – vuln.today
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