CVE-2026-23209— macvlan: fix error recovery in macvlan_common_newlink()
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I. Basic Information for CVE-2026-23209
Vulnerability Information
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Vulnerability Title
macvlan: fix error recovery in macvlan_common_newlink()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: macvlan: fix error recovery in macvlan_common_newlink() valis provided a nice repro to crash the kernel: ip link add p1 type veth peer p2 ip link set address 00:00:00:00:00:20 dev p1 ip link set up dev p1 ip link set up dev p2 ip link add mv0 link p2 type macvlan mode source ip link add invalid% link p2 type macvlan mode source macaddr add 00:00:00:00:00:20 ping -c1 -I p1 1.2.3.4 He also gave a very detailed analysis: <quote valis> The issue is triggered when a new macvlan link is created with MACVLAN_MODE_SOURCE mode and MACVLAN_MACADDR_ADD (or MACVLAN_MACADDR_SET) parameter, lower device already has a macvlan port and register_netdevice() called from macvlan_common_newlink() fails (e.g. because of the invalid link name). In this case macvlan_hash_add_source is called from macvlan_change_sources() / macvlan_common_newlink(): This adds a reference to vlan to the port's vlan_source_hash using macvlan_source_entry. vlan is a pointer to the priv data of the link that is being created. When register_netdevice() fails, the error is returned from macvlan_newlink() to rtnl_newlink_create(): if (ops->newlink) err = ops->newlink(dev, ¶ms, extack); else err = register_netdevice(dev); if (err < 0) { free_netdev(dev); goto out; } and free_netdev() is called, causing a kvfree() on the struct net_device that is still referenced in the source entry attached to the lower device's macvlan port. Now all packets sent on the macvlan port with a matching source mac address will trigger a use-after-free in macvlan_forward_source(). </quote valis> With all that, my fix is to make sure we call macvlan_flush_sources() regardless of @create value whenever "goto destroy_macvlan_port;" path is taken. Many thanks to valis for following up on this issue.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于macvlan_common_newlink函数错误恢复不当，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-23209
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Same Patch Batch · Linux · 2026-02-14 · 108 CVEs total
| CVE-2026-23193 | 8.8 HIGH | scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count() |
| CVE-2026-23172 | 8.4 HIGH | net: wwan: t7xx: fix potential skb->frags overflow in RX path |
| CVE-2026-23178 | 7.8 HIGH | HID: i2c-hid: fix potential buffer overflow in i2c_hid_get_report() |
| CVE-2026-23184 | 7.8 HIGH | binder: fix UAF in binder_netlink_report() |
| CVE-2026-23185 | 7.8 HIGH | wifi: iwlwifi: mld: cancel mlo_scan_start_wk |
| CVE-2026-23171 | 7.8 HIGH | bonding: fix use-after-free due to enslave fail after slave array update |
| CVE-2026-23169 | 7.8 HIGH | mptcp: fix race in mptcp_pm_nl_flush_addrs_doit() |
| CVE-2026-23191 | 7.8 HIGH | ALSA: aloop: Fix racy access at PCM trigger |
| CVE-2026-23198 | 7.8 HIGH | KVM: Don't clobber irqfd routing type when deassigning irqfd |
| CVE-2026-23192 | 7.8 HIGH | linkwatch: use __dev_put() in callers to prevent UAF |
| CVE-2026-23136 | 7.5 HIGH | libceph: reset sparse-read state in osd_fault() |
| CVE-2026-23139 | 7.5 HIGH | netfilter: nf_conncount: update last_gc only when GC has been performed |
| CVE-2026-23148 | 7.5 HIGH | nvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference |
| CVE-2026-23161 | 7.3 HIGH | mm/shmem, swap: fix race of truncate and swap entry split |
| CVE-2026-23204 | 7.1 HIGH | net/sched: cls_u32: use skb_header_pointer_careful() |
| CVE-2026-23195 | 7.0 HIGH | cgroup/dmem: avoid pool UAF |
| CVE-2026-23180 | 7.0 HIGH | dpaa2-switch: add bounds check for if_id in IRQ handler |
| CVE-2026-23175 | 7.0 HIGH | net: cpsw: Execute ndo_set_rx_mode callback in a work queue |
| CVE-2026-23140 | bpf, test_run: Subtract size of xdp_frame from allowed metadata size | |
| CVE-2025-71202 | iommu/sva: invalidate stale IOTLB entries for kernel address space |
Showing top 20 of 108 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2026-23209
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