CVE-2026-31508: net: openvswitch: Avoid releasing netdev before teardown completes
Noroxi assessment
Priority: Monitor (action score 31/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.10% (FIRST EPSS).
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Linux Linux 33609454be4f582e686a4bf13d4482a5ca0f6c4b, 43579baa17270aa51f93eb09b6e4af6e047b7f6e, 4c3e25a7b711a402fcbbbcfbbdf2868ece1ae7c8; azl3 kernel 6.6.130.1-3 on Azure Linux 3.0 6.6.137.1-1; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes.
Low priority for now. Upgrade to Linux Linux 33609454be4f582e686a4bf13d4482a5ca0f6c4b, 43579baa17270aa51f93eb09b6e4af6e047b7f6e, 4c3e25a7b711a402fcbbbcfbbdf2868ece1ae7c8; azl3 kernel 6.6.130.1-3 on Azure Linux 3.0 6.6.137.1-1; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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---
- Published
- Apr 22, 2026
- Updated
- Oct 19, 2026
- EPSS
- 0.1% · 1th percentile
- CWE
- CWE-362
Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.8
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel5.10.248 and later · before 5.10.253
- linux linux kernel5.15.198 and later · before 5.15.203
- linux linux kernel6.1.160 and later · before 6.1.168
- linux linux kernel6.6.120 and later · before 6.6.131
- linux linux kernel6.12.64 and later · before 6.12.80
- linux linux kernel6.18.4 and later · before 6.18.21
- linux linux kernel6.19.1 and later · before 6.19.11
- linux linux kernel6.19
- linux linux kernel7.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 6.19affected
- b823c3344d5446b720227ba561df10a4f0add515 and later · before df3c95be76103604e752131d9495a24814915eceaffected · git
- 052e5db5be4576e0a8ef1460b210da5f328f4cd1 and later · before 33609454be4f582e686a4bf13d4482a5ca0f6c4baffected · git
- c98263d5ace597c096a7a60aeef790da7b54979e and later · before 5fdeaf591a0942772c2d18ff3563697a49ad01c6affected · git
- 0fc642f011cb7a7eff41109e66d3b552e9f4d795 and later · before 4c3e25a7b711a402fcbbbcfbbdf2868ece1ae7c8affected · git
- 5116f61ab11846844585c9082c547c4ccd97ff1a and later · before 43579baa17270aa51f93eb09b6e4af6e047b7f6eaffected · git
- f31557fb1b35332cca9994aa196cef284bcf3807 and later · before 95265232b49765a4d00f4d028c100bb7185600f4affected · git
- 5498227676303e3ffa9a3a46214af96bc3e81314 and later · before 755a6300afbd743cda4b102f24f343380ec0e0ffaffected · git
- 5498227676303e3ffa9a3a46214af96bc3e81314 and later · before 7c770dadfda5cbbde6aa3c4363ed513f1d212bf8affected · git
- 5.10.248 and later · before 5.10.253affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:9 | kernel | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k-core | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-core | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-devel | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-devel-matched | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-modules | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-modules-core | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-modules-extra | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k-devel | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k-devel-matched | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k-modules | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k-modules-core | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-64k-modules-extra | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-abi-stablelists | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-core | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-cross-headers | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-debug | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-debug-core | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-debug-devel | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-debug-devel-matched | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-debug-modules | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
| AlmaLinux:9 | kernel-debug-modules-core | before 5.14.0-687.15.1.el9_8 | 5.14.0-687.15.1.el9_8 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2026-31506Apr 22, 2026 · net: bcmasp: fix double free of WoL irq31Monitor
- ← EarlierCVE-2026-31507Apr 22, 2026 · net/smc: fix double-free of smc_spd_priv when tee() duplicates splice pipe buffer31Monitor
- Later →CVE-2026-31511Apr 22, 2026 · Bluetooth: MGMT: Fix dangling pointer on mgmt_add_adv_patterns_monitor_complete31Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 33609454be4f582e686a4bf13d4482a5ca0f6c4b | Vendor (CNA) |
| Linux Linux | 43579baa17270aa51f93eb09b6e4af6e047b7f6e | Vendor (CNA) |
| Linux Linux | 4c3e25a7b711a402fcbbbcfbbdf2868ece1ae7c8 | Vendor (CNA) |
| Linux Linux | 5.10.253 | Vendor (CNA) |
| Linux Linux | 5.15.203 | Vendor (CNA) |
| Linux Linux | 5fdeaf591a0942772c2d18ff3563697a49ad01c6 | Vendor (CNA) |
| Linux Linux | 6.1.168 | Vendor (CNA) |
| Linux Linux | 6.12.80 | Vendor (CNA) |
| Linux Linux | 6.18.21 | Vendor (CNA) |
| Linux Linux | 6.6.131 | Vendor (CNA) |
| Linux Linux | 755a6300afbd743cda4b102f24f343380ec0e0ff | Vendor (CNA) |
| Linux Linux | 7c770dadfda5cbbde6aa3c4363ed513f1d212bf8 | Vendor (CNA) |
| Linux Linux | 95265232b49765a4d00f4d028c100bb7185600f4 | Vendor (CNA) |
| Linux Linux | df3c95be76103604e752131d9495a24814915ece | Vendor (CNA) |
| azl3 kernel 6.6.130.1-3 on Azure Linux 3.0 | 6.6.137.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 | Release Notes | Microsoft (MSRC) |
| almalinux:kernel | 5.14.0-687.15.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k | 5.14.0-687.15.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-core | 5.14.0-687.15.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug | 5.14.0-687.15.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-core | 5.14.0-687.15.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel | 5.14.0-687.15.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel-matched | 5.14.0-687.15.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules | 5.14.0-687.15.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-core | 5.14.0-687.15.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-extra | 5.14.0-687.15.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel | 5.14.0-687.15.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel-matched | 5.14.0-687.15.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| debian:linux | 6.1.170-1 · Debian:12 | Package registry (OSV) |
| red hat:bpftool-debuginfo | 0:7.3.0-427.130.1.el9_4 · Red Hat:rhel_e4s:9.4::appstream | Package registry (OSV) |
+12
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (10 more)Show less
- git.kernel.org/stable/c/43579baa17270aa51f93eb09b6e4af6e047b7f6e
- git.kernel.org/stable/c/4c3e25a7b711a402fcbbbcfbbdf2868ece1ae7c8
- git.kernel.org/stable/c/5fdeaf591a0942772c2d18ff3563697a49ad01c6
- git.kernel.org/stable/c/755a6300afbd743cda4b102f24f343380ec0e0ff
- git.kernel.org/stable/c/7c770dadfda5cbbde6aa3c4363ed513f1d212bf8
- git.kernel.org/stable/c/95265232b49765a4d00f4d028c100bb7185600f4
- git.kernel.org/stable/c/df3c95be76103604e752131d9495a24814915ece
- cert-portal.siemens.com/productcert/html/ssa-019113.html
- cert-portal.siemens.com/productcert/html/ssa-082556.html
- cert-portal.siemens.com/productcert/html/ssa-457936.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.