CVE-2026-23120: l2tp: avoid one data-race in l2tp_tunnel_del_work()
Noroxi assessment
Priority: Monitor (action score 22/100)
- 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 1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4, 3.17, 32d417497b79efb403d75f4c185fe6fd9d64b94f.
Low priority for now. Upgrade to Linux Linux 1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4, 3.17, 32d417497b79efb403d75f4c185fe6fd9d64b94f 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: l2tp: avoid one data-race in l2tp_tunnel_del_work() We should read sk->sk_socket only when dealing with kernel sockets. syzbot reported the following data-race: BUG: KCSAN: data-race in l2tp_tunnel_del_work / sk_common_release write to 0xffff88811c182b20 of 8 bytes by task 5365 on cpu 0: sk_set_socket include/net/sock.h:2092 [inline] sock_orphan include/net/sock.h:2118 [inline] sk_common_release+0xae/0x230 net/core/sock.c:4003 udp_lib_close+0x15/0x20 include/net/udp.h:325 inet_release+0xce/0xf0 net/ipv4/af_inet.c:437 __sock_release net/socket.c:662 [inline] sock_close+0x6b/0x150 net/socket.c:1455 __fput+0x29b/0x650 fs/file_table.c:468 ____fput+0x1c/0x30 fs/file_table.c:496 task_work_run+0x131/0x1a0 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0x1fe/0x740 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x1e1/0x2b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88811c182b20 of 8 bytes by task 827 on cpu 1: l2tp_tunnel_del_work+0x2f/0x1a0 net/l2tp/l2tp_core.c:1418 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3340 worker_thread+0x582/0x770 kernel/workqueue.c:3421 kthread+0x489/0x510 kernel/kthread.c:463 ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 value changed: 0xffff88811b818000 -> 0x0000000000000000
- Published
- Feb 14, 2026
- Updated
- Oct 19, 2026
- EPSS
- 0.1% · 1th percentile
- CWE
- CWE-362
Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
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.
Running WordPress? Scan your site free with WP Lens
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 kernel3.16.57 and later · before 3.17
- linux linux kernel4.15.8 and later · before 4.16
- linux linux kernel4.16.1 and later · before 5.10.249
- linux linux kernel5.11 and later · before 5.15.199
- linux linux kernel5.16 and later · before 6.1.162
- linux linux kernel6.2 and later · before 6.6.122
- linux linux kernel6.7 and later · before 6.12.68
- linux linux kernel6.13 and later · before 6.18.8
- linux linux kernel4.16
- linux linux kernel6.19
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
- 15df699fdc5af46a9fb15ae2d9326294852de5b5, 18bdaefc715b4530b4b2fe670506bb47713664cc, 4.16affected
- d00fa9adc528c1b0e64d532556764852df8bd7b9 and later · before 1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4affected · git
- d00fa9adc528c1b0e64d532556764852df8bd7b9 and later · before 36c40a80109f1771d59558050b1a71e13c60c759affected · git
- d00fa9adc528c1b0e64d532556764852df8bd7b9 and later · before eae074dab764ea181bbed5e88626889319177498affected · git
- d00fa9adc528c1b0e64d532556764852df8bd7b9 and later · before 68e92085427c84e7679ddb53c0d68836d220b6e7affected · git
- d00fa9adc528c1b0e64d532556764852df8bd7b9 and later · before 3d6d414b214ce31659bded2f8df50c93a3769474affected · git
- d00fa9adc528c1b0e64d532556764852df8bd7b9 and later · before 32d417497b79efb403d75f4c185fe6fd9d64b94faffected · git
- d00fa9adc528c1b0e64d532556764852df8bd7b9 and later · before 7a29f6bf60f2590fe5e9c4decb451e19afad2bcfaffected · git
- 3.16.57 and later · before 3.17affected · semver
- 4.15.8 and later · before 4.16affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.162-1 | 6.1.162-1 |
| Debian:13 | linux | before 6.12.69-1 | 6.12.69-1 |
| Debian:14 | linux | before 6.18.8-1 | 6.18.8-1 |
| openSUSE:Leap 16.0 | dtb-aarch64 | before 6.12.0-160000.28.1 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-64kb | before 6.12.0-160000.28.1 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-azure | before 6.12.0-160000.28.1 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-default | before 6.12.0-160000.28.1 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-default-base | before 6.12.0-160000.27.1.160000.2.8 | 6.12.0-160000.27.1.160000.2.8 |
| openSUSE:Leap 16.0 | kernel-docs | before 6.12.0-160000.28.1 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-kvmsmall | before 6.12.0-160000.28.1 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-obs-build | before 6.12.0-160000.28.1 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-obs-qa | before 6.12.0-160000.28.1 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-rt | before 6.12.0-160000.28.1 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-source | before 6.12.0-160000.28.1 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-syms | before 6.12.0-160000.28.1 | 6.12.0-160000.28.1 |
| openSUSE:Leap 16.0 | kernel-zfcpdump | before 6.12.0-160000.28.1 | 6.12.0-160000.28.1 |
| SUSE:Linux Enterprise Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7-RT_Update_11 | before 1-150700.1.3.1 | 1-150700.1.3.1 |
| SUSE:Linux Micro 6.1 | kernel-default | before 6.4.0-41.1 | 6.4.0-41.1 |
| SUSE:Linux Micro 6.1 | kernel-default-base | before 6.4.0-41.1.21.18 | 6.4.0-41.1.21.18 |
| SUSE:Linux Micro 6.1 | kernel-kvmsmall | before 6.4.0-41.1 | 6.4.0-41.1 |
| SUSE:Linux Micro 6.1 | kernel-rt | before 6.4.0-41.1 | 6.4.0-41.1 |
| SUSE:Linux Micro 6.1 | kernel-source | before 6.4.0-41.1 | 6.4.0-41.1 |
| SUSE:Linux Micro 6.1 | kernel-source-rt | before 6.4.0-41.1 | 6.4.0-41.1 |
| SUSE:Linux Micro 6.2 | gdk-pixbuf | before 2.42.12-160000.4.1 | 2.42.12-160000.4.1 |
+10
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-2026-23118Feb 14, 2026 · rxrpc: Fix data-race warning and potential load/store tearing18Monitor
- ← EarlierCVE-2026-23119Feb 14, 2026 · bonding: provide a net pointer to __skb_flow_dissect()22Monitor
- Later →CVE-2026-23121Feb 14, 2026 · mISDN: annotate data-race around dev->work22Monitor
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 | 1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4 | Vendor (CNA) |
| Linux Linux | 3.17 | Vendor (CNA) |
| Linux Linux | 32d417497b79efb403d75f4c185fe6fd9d64b94f | Vendor (CNA) |
| Linux Linux | 36c40a80109f1771d59558050b1a71e13c60c759 | Vendor (CNA) |
| Linux Linux | 3d6d414b214ce31659bded2f8df50c93a3769474 | Vendor (CNA) |
| Linux Linux | 4.16 | Vendor (CNA) |
| Linux Linux | 68e92085427c84e7679ddb53c0d68836d220b6e7 | Vendor (CNA) |
| Linux Linux | 7a29f6bf60f2590fe5e9c4decb451e19afad2bcf | Vendor (CNA) |
| Linux Linux | eae074dab764ea181bbed5e88626889319177498 | Vendor (CNA) |
| debian:linux | 6.1.162-1 · Debian:12 | Package registry (OSV) |
| opensuse:dtb-aarch64 | 6.12.0-160000.28.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-64kb | 6.12.0-160000.28.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-azure | 6.12.0-160000.28.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-default | 6.12.0-160000.28.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-default-base | 6.12.0-160000.27.1.160000.2.8 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-docs | 6.12.0-160000.28.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 6.12.0-160000.28.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-obs-build | 6.12.0-160000.28.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 6.12.0-160000.28.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-rt | 6.12.0-160000.28.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-source | 6.12.0-160000.28.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-syms | 6.12.0-160000.28.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| suse:gdk-pixbuf | 2.42.12-160000.4.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-64kb | 6.12.0-160000.28.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-default | 6.4.0-41.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-default-base | 6.4.0-41.1.21.18 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-kvmsmall | 6.4.0-41.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP7-RT_Update_11 | 1-150700.1.3.1 · SUSE:Linux Enterprise Live Patching 15 SP7 | Package registry (OSV) |
| suse:kernel-obs-build | 6.12.0-160000.28.1 · SUSE:Linux Micro Extras 6.2 | Package registry (OSV) |
| suse:kernel-rt | 6.4.0-150700.7.37.2 · SUSE:Real Time Module 15 SP7 | Package registry (OSV) |
+4
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
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- 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:N/I:N/A:H
nvd-primary
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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (6 more)Show less
- git.kernel.org/stable/c/32d417497b79efb403d75f4c185fe6fd9d64b94f
- git.kernel.org/stable/c/36c40a80109f1771d59558050b1a71e13c60c759
- git.kernel.org/stable/c/3d6d414b214ce31659bded2f8df50c93a3769474
- git.kernel.org/stable/c/68e92085427c84e7679ddb53c0d68836d220b6e7
- git.kernel.org/stable/c/7a29f6bf60f2590fe5e9c4decb451e19afad2bcf
- git.kernel.org/stable/c/eae074dab764ea181bbed5e88626889319177498
Vendor advisories and official records. Exploit/PoC links are deliberately left out.