CVE-2026-74624: netfilter: nf_conntrack: defer invalid log until after unlock
Noroxi assessment
Priority: Monitor (action score 30/100)
- 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: 0.47% (FIRST EPSS).
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: Linux Linux 0424186d570aa4d1ad17f516afb86bd9eaa4f42e, 2d19b95c9723001f214f7a47d67b09f46238f200, 63853eb20bba4e00b7cd0b8cfc19337bbaaf5037; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 0424186d570aa4d1ad17f516afb86bd9eaa4f42e, 2d19b95c9723001f214f7a47d67b09f46238f200, 63853eb20bba4e00b7cd0b8cfc19337bbaaf5037; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1 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: netfilter: nf_conntrack: defer invalid log until after unlock TCP and SCTP conntrack paths can emit invalid-packet logs while ct->lock is still held. When invalid logging is routed to nfnetlink_log and conntrack export is enabled, the log path can re-enter conntrack netlink glue and dump the same conntrack again. Protocol attribute dumping may take ct->lock, so logging while holding that lock can deadlock. Defer the TCP invalid logs by storing only the minimal log context while ct->lock is held and emitting the log after unlocking. Also make the TCP timeout-lowering invalid path return whether a log is needed, then emit that log after unlocking. Do the same for the SCTP invalid state-transition log that can be reached while ct->lock is held. Add a lockdep assertion to nf_ct_l4proto_log_invalid() so future callers that log invalid conntracks while holding ct->lock are caught outside TCP and SCTP as well.
- Published
- Aug 22, 2026
- Updated
- Oct 16, 2026
- EPSS
- 0.4% · 41th percentile
- CWE
- —
Report tools
Action score
30
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.5
- 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.
Is your version affected? Check itNoroxi 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.
—
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
- 6.1affected
- d9a6f0d0df1899ff9086a57abc600e414f4b8cdd and later · before ca97360eba4b3dc67f1804625542f4ccc774242aaffected · git
- d9a6f0d0df1899ff9086a57abc600e414f4b8cdd and later · before 63853eb20bba4e00b7cd0b8cfc19337bbaaf5037affected · git
- d9a6f0d0df1899ff9086a57abc600e414f4b8cdd and later · before 9480fcf70a5aa9d320088a01c95df0e5e6391f4aaffected · git
- d9a6f0d0df1899ff9086a57abc600e414f4b8cdd and later · before 0424186d570aa4d1ad17f516afb86bd9eaa4f42eaffected · git
- d9a6f0d0df1899ff9086a57abc600e414f4b8cdd and later · before c0224327b7cbed9d3198e8dbec847281053dcd06affected · git
- d9a6f0d0df1899ff9086a57abc600e414f4b8cdd and later · before 2d19b95c9723001f214f7a47d67b09f46238f200affected · git
- before 6.1not affected · semver
- 6.1.184 and later · up to and including 6.1.*not affected · semver
- 6.6.152 and later · up to and including 6.6.*not affected · 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 6.1.187-1 | 6.1.187-1 |
| Debian:12 | linux-6.12 | before 6.12.107-1~deb12u1 | 6.12.107-1~deb12u1 |
| Debian:13 | linux | before 6.12.105-1 | 6.12.105-1 |
| Debian:14 | linux | before 7.1.9-1 | 7.1.9-1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-64kb | before 5.14.21-150400.24.246.1 | 5.14.21-150400.24.246.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-docs | before 5.14.21-150400.24.246.1 | 5.14.21-150400.24.246.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-obs-build | before 5.14.21-150400.24.246.1 | 5.14.21-150400.24.246.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-syms | before 5.14.21-150400.24.246.1 | 5.14.21-150400.24.246.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-64kb | before 5.14.21-150500.55.195.1 | 5.14.21-150500.55.195.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-docs | before 5.14.21-150500.55.195.1 | 5.14.21-150500.55.195.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-obs-build | before 5.14.21-150500.55.195.1 | 5.14.21-150500.55.195.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-syms | before 5.14.21-150500.55.195.1 | 5.14.21-150500.55.195.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_61 | before 1-150400.9.3.1 | 1-150400.9.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_47 | before 1-150500.11.3.1 | 1-150500.11.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-default | before 6.4.0-150600.23.143.1 | 6.4.0-150600.23.143.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_33 | before 1-150600.13.5.1 | 1-150600.13.5.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default | before 5.14.21-150400.24.246.1 | 5.14.21-150400.24.246.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default-base | before 5.14.21-150400.24.246.1.150400.24.124.1 | 5.14.21-150400.24.246.1.150400.24.124.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-source | before 5.14.21-150400.24.246.1 | 5.14.21-150400.24.246.1 |
| SUSE:Linux Enterprise Micro 5.4 | kernel-rt | before 5.14.21-150400.15.192.2 | 5.14.21-150400.15.192.2 |
| SUSE:Linux Enterprise Micro 5.4 | kernel-source-rt | before 5.14.21-150400.15.192.2 | 5.14.21-150400.15.192.2 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default | before 5.14.21-150500.55.195.1 | 5.14.21-150500.55.195.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default-base | before 5.14.21-150500.55.195.1.150500.6.91.1 | 5.14.21-150500.55.195.1.150500.6.91.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-rt | before 5.14.21-150500.13.167.2 | 5.14.21-150500.13.167.2 |
+11
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
Published before and after this one in the same product
- ← EarlierCVE-2026-74622Aug 22, 2026 · net: atlantic: free RX pages of consumed but not refilled buffers0Monitor
- ← EarlierCVE-2026-74623Aug 22, 2026 · net: atlantic: free stranded TX buffers on ring deinit0Monitor
- Later →CVE-2026-74625Aug 22, 2026 · netfilter: bridge: release template ct on non-IP path30Monitor
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 | 0424186d570aa4d1ad17f516afb86bd9eaa4f42e | Vendor (CNA) |
| Linux Linux | 2d19b95c9723001f214f7a47d67b09f46238f200 | Vendor (CNA) |
| Linux Linux | 63853eb20bba4e00b7cd0b8cfc19337bbaaf5037 | Vendor (CNA) |
| Linux Linux | 9480fcf70a5aa9d320088a01c95df0e5e6391f4a | Vendor (CNA) |
| Linux Linux | c0224327b7cbed9d3198e8dbec847281053dcd06 | Vendor (CNA) |
| Linux Linux | ca97360eba4b3dc67f1804625542f4ccc774242a | Vendor (CNA) |
| azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 | 6.6.152.1-1 · Release Notes | Microsoft (MSRC) |
| debian:linux | 6.1.187-1 · Debian:12 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.107-1~deb12u1 · Debian:12 | Package registry (OSV) |
| suse:kernel-64kb | 6.4.0-150600.23.143.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-default | 6.4.0-150600.23.143.1 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-default-base | 6.4.0-150600.23.143.1.150600.12.66.3 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-docs | 6.4.0-150600.23.143.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP4_Update_61 | 1-150400.9.3.1 · SUSE:Linux Enterprise Live Patching 15 SP4 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP5_Update_47 | 1-150500.11.3.1 · SUSE:Linux Enterprise Live Patching 15 SP5 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP6_Update_33 | 1-150600.13.5.1 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-obs-build | 6.4.0-150600.23.143.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-rt | 5.14.21-150500.13.167.2 · SUSE:Linux Enterprise Micro 5.5 | Package registry (OSV) |
| suse:kernel-source | 6.4.0-150600.23.143.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-syms | 6.4.0-150600.23.143.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-zfcpdump | 6.4.0-150600.23.143.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
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.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-0893 · Aug 24, 2026(Linux Kernel Güvenlik Bildirimi)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- 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
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (5 more)Show less
- git.kernel.org/stable/c/2d19b95c9723001f214f7a47d67b09f46238f200
- git.kernel.org/stable/c/63853eb20bba4e00b7cd0b8cfc19337bbaaf5037
- git.kernel.org/stable/c/9480fcf70a5aa9d320088a01c95df0e5e6391f4a
- git.kernel.org/stable/c/c0224327b7cbed9d3198e8dbec847281053dcd06
- git.kernel.org/stable/c/ca97360eba4b3dc67f1804625542f4ccc774242a
Vendor advisories and official records. Exploit/PoC links are deliberately left out.