CVE-2026-64580: xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()
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: 0.12% (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 136992de9bb91871084ae52d172610541c76e4d2, 3.1, 3.10; azl3 kernel 6.6.145.2-1 on Azure Linux 3.0 6.6.150.1-1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 136992de9bb91871084ae52d172610541c76e4d2, 3.1, 3.10; azl3 kernel 6.6.145.2-1 on Azure Linux 3.0 6.6.150.1-1 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: xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst() On the error path where in6_dev_get(dev) returns NULL, xfrm6_fill_dst() releases the device reference with netdev_put() but leaves xdst->u.dst.dev set. dst_destroy() later calls netdev_put(dst->dev) again, so the same net_device reference is released twice, underflowing its refcount (ref_tracker WARNING + "unregister_netdevice: waiting for <dev> to become free"). Clear xdst->u.dst.dev after the netdev_put(), the same way the XFRM device-offload paths xfrm_dev_state_add() and xfrm_dev_policy_add() in net/xfrm/xfrm_device.c NULL ->dev when releasing the reference on error. ref_tracker: reference already released. ref_tracker: allocated in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:86) ... udpv6_sendmsg (net/ipv6/udp.c:1696) ... ref_tracker: freed in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:90) ... WARNING: lib/ref_tracker.c:322 at ref_tracker_free+0x58b/0x780 dst_destroy (net/core/dst.c:115) rcu_core handle_softirqs ...
- Published
- Aug 5, 2026
- Updated
- Oct 19, 2026
- EPSS
- 0.1% · 2th percentile
- CWE
- CWE-415
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.
—
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
- a7e22d0c0e81dde129a51ee413644124f4b59954, 01b0d887f67a388fb2a658ee2bdd74e5ba146818, a98124aac0b5adc5de8ae54f11322781cb4d85c3, e27b7bee743d921f037b1da6f071237345bef7c1, 3.10affected
- 84c4a9dfbf430861e7588d95ae3ff61535dca351 and later · before 97e032e5733e49471fb73de117ea2ac1ac7c479aaffected · git
- 84c4a9dfbf430861e7588d95ae3ff61535dca351 and later · before df6856c2dda9187601d29b5fbd7a81b3b178cedfaffected · git
- 84c4a9dfbf430861e7588d95ae3ff61535dca351 and later · before 43de8a49335e611adb271bbd52e84dfbc11fc185affected · git
- 84c4a9dfbf430861e7588d95ae3ff61535dca351 and later · before ff636d7b7cba6dea82ecf580415ea57f2c1a11b6affected · git
- 84c4a9dfbf430861e7588d95ae3ff61535dca351 and later · before e078da1b4e11390cff3201c19a9a1fe70c5b934faffected · git
- 84c4a9dfbf430861e7588d95ae3ff61535dca351 and later · before 136992de9bb91871084ae52d172610541c76e4d2affected · git
- 3.0.79 and later · before 3.1affected · semver
- 3.2.46 and later · before 3.3affected · semver
- 3.4.46 and later · before 3.5affected · 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 6.12.101-1~deb12u1 | 6.12.101-1~deb12u1 |
| Debian:13 | linux | before 6.12.101-1 | 6.12.101-1 |
| Debian:14 | linux | before 7.1.6-1 | 7.1.6-1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-64kb | before 5.14.21-150400.24.243.1 | 5.14.21-150400.24.243.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-docs | before 5.14.21-150400.24.243.1 | 5.14.21-150400.24.243.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-obs-build | before 5.14.21-150400.24.243.1 | 5.14.21-150400.24.243.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-syms | before 5.14.21-150400.24.243.1 | 5.14.21-150400.24.243.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-64kb | before 5.14.21-150500.55.192.2 | 5.14.21-150500.55.192.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-docs | before 5.14.21-150500.55.192.1 | 5.14.21-150500.55.192.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-obs-build | before 5.14.21-150500.55.192.2 | 5.14.21-150500.55.192.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-syms | before 5.14.21-150500.55.192.1 | 5.14.21-150500.55.192.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_60 | before 1-150400.9.3.1 | 1-150400.9.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_46 | before 1-150500.11.3.2 | 1-150500.11.3.2 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-default | before 6.4.0-150600.23.138.1 | 6.4.0-150600.23.138.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_32 | before 1-150600.13.3.1 | 1-150600.13.3.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default | before 5.14.21-150400.24.243.1 | 5.14.21-150400.24.243.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default-base | before 5.14.21-150400.24.243.1.150400.24.122.1 | 5.14.21-150400.24.243.1.150400.24.122.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-rt | before 5.14.21-150400.15.189.1 | 5.14.21-150400.15.189.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-source | before 5.14.21-150400.24.243.1 | 5.14.21-150400.24.243.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-source-rt | before 5.14.21-150400.15.189.1 | 5.14.21-150400.15.189.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default | before 5.14.21-150500.55.192.2 | 5.14.21-150500.55.192.2 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default-base | before 5.14.21-150500.55.192.2.150500.6.89.2 | 5.14.21-150500.55.192.2.150500.6.89.2 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-rt | before 5.14.21-150500.13.164.1 | 5.14.21-150500.13.164.1 |
+18
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-2026-64575Aug 5, 2026 · bpf: tcp: fix double sock release on batch realloc31Monitor
- ← EarlierCVE-2026-64576Aug 5, 2026 · nexthop: initialize extack in nh_res_bucket_migrate()28Monitor
- Later →CVE-2026-64581Aug 5, 2026 · xfrm: fix sk_dst_cache double-free in xfrm_user_policy()31Monitor
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 | 136992de9bb91871084ae52d172610541c76e4d2 | Vendor (CNA) |
| Linux Linux | 3.1 | Vendor (CNA) |
| Linux Linux | 3.10 | Vendor (CNA) |
| Linux Linux | 3.3 | Vendor (CNA) |
| Linux Linux | 3.5 | Vendor (CNA) |
| Linux Linux | 43de8a49335e611adb271bbd52e84dfbc11fc185 | Vendor (CNA) |
| Linux Linux | 97e032e5733e49471fb73de117ea2ac1ac7c479a | Vendor (CNA) |
| Linux Linux | df6856c2dda9187601d29b5fbd7a81b3b178cedf | Vendor (CNA) |
| Linux Linux | e078da1b4e11390cff3201c19a9a1fe70c5b934f | Vendor (CNA) |
| Linux Linux | ff636d7b7cba6dea82ecf580415ea57f2c1a11b6 | Vendor (CNA) |
| azl3 kernel 6.6.145.2-1 on Azure Linux 3.0 | 6.6.150.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.187-1 · Debian:12 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.101-1~deb12u1 · Debian:12 | Package registry (OSV) |
| suse:kernel-64kb | 6.4.0-150600.23.138.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-default | 3.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-default-base | 6.4.0-150600.23.138.1.150600.12.64.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-docs | 3.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-ec2 | 3.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP6_Update_32 | 1-150600.13.3.1 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-obs-build | 6.4.0-150600.23.138.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-source | 3.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-syms | 3.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-trace | 3.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-xen | 3.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-zfcpdump | 6.4.0-150600.23.138.1 · 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.
- CVE-2026-645971 days apartsmb: client: fix double-free in SMB2_close() replay39Monitor
- CVE-2026-645359 days apartnvmet-tcp: Fix potential UAF when ddgst mismatch39Monitor
- CVE-2026-681925 days apartwifi: brcmfmac: make release_scratchbuffers idempotent35Monitor
- CVE-2026-645700 days apartwifi: mac80211: fix fils_discovery double free on alloc failure31Monitor
- CVE-2026-645991 days apartcrypto: amlogic - avoid double cleanup in meson_crypto_probe()31Monitor
- CVE-2026-682365 days apartdrm/amd/display: set new_stream to NULL after release31Monitor
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-26-0742 · Aug 5, 2026(Linux Kernel Güvenlik Bildirimi)
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-415 · Double FreeCVSS 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.
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/43de8a49335e611adb271bbd52e84dfbc11fc185
- git.kernel.org/stable/c/97e032e5733e49471fb73de117ea2ac1ac7c479a
- git.kernel.org/stable/c/df6856c2dda9187601d29b5fbd7a81b3b178cedf
- git.kernel.org/stable/c/e078da1b4e11390cff3201c19a9a1fe70c5b934f
- git.kernel.org/stable/c/ff636d7b7cba6dea82ecf580415ea57f2c1a11b6
Vendor advisories and official records. Exploit/PoC links are deliberately left out.