CVE-2026-64580
xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()
Description
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 ...
INFO
Published Date :
Aug. 5, 2026, 8:16 a.m.
Last Modified :
Aug. 5, 2026, 8:16 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64580
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to the latest version.
- Apply the provided patch to resolve the issue.
- Ensure proper error handling in device reference counting.
- Clear device pointer after netdev_put on error.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64580.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64580 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64580
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64580 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64580 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 05, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '84c4a9dfbf430861e7588d95ae3ff61535dca351', 'lessThan': 'df6856c2dda9187601d29b5fbd7a81b3b178cedf', 'versionType': 'git'}, {'status': 'affected', 'version': '84c4a9dfbf430861e7588d95ae3ff61535dca351', 'lessThan': '43de8a49335e611adb271bbd52e84dfbc11fc185', 'versionType': 'git'}, {'status': 'affected', 'version': '84c4a9dfbf430861e7588d95ae3ff61535dca351', 'lessThan': 'ff636d7b7cba6dea82ecf580415ea57f2c1a11b6', 'versionType': 'git'}, {'status': 'affected', 'version': '84c4a9dfbf430861e7588d95ae3ff61535dca351', 'lessThan': 'e078da1b4e11390cff3201c19a9a1fe70c5b934f', 'versionType': 'git'}, {'status': 'affected', 'version': '84c4a9dfbf430861e7588d95ae3ff61535dca351', 'lessThan': '136992de9bb91871084ae52d172610541c76e4d2', 'versionType': 'git'}, {'status': 'affected', 'version': 'a7e22d0c0e81dde129a51ee413644124f4b59954', 'versionType': 'git'}, {'status': 'affected', 'version': '01b0d887f67a388fb2a658ee2bdd74e5ba146818', 'versionType': 'git'}, {'status': 'affected', 'version': 'a98124aac0b5adc5de8ae54f11322781cb4d85c3', 'versionType': 'git'}, {'status': 'affected', 'version': 'e27b7bee743d921f037b1da6f071237345bef7c1', 'versionType': 'git'}, {'status': 'affected', 'version': '3.0.79', 'lessThan': '3.1', 'versionType': 'semver'}, {'status': 'affected', 'version': '3.2.46', 'lessThan': '3.3', 'versionType': 'semver'}, {'status': 'affected', 'version': '3.4.46', 'lessThan': '3.5', 'versionType': 'semver'}, {'status': 'affected', 'version': '3.9.3', 'lessThan': '3.10', 'versionType': 'semver'}], 'programFiles': ['net/ipv6/xfrm6_policy.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.10'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.10', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc4', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/xfrm6_policy.c'], 'defaultStatus': 'affected'}] Added Description 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 ... Added Reference https://git.kernel.org/stable/c/136992de9bb91871084ae52d172610541c76e4d2 Added Reference https://git.kernel.org/stable/c/43de8a49335e611adb271bbd52e84dfbc11fc185 Added Reference https://git.kernel.org/stable/c/df6856c2dda9187601d29b5fbd7a81b3b178cedf Added Reference https://git.kernel.org/stable/c/e078da1b4e11390cff3201c19a9a1fe70c5b934f Added Reference https://git.kernel.org/stable/c/ff636d7b7cba6dea82ecf580415ea57f2c1a11b6