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CVE-2026-23273— macvlan: observe an RCU grace period in macvlan_common_newlink() error path

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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错误路径中缺少RCU宽限期，可能导致释放后重用问题。

CVSS 7.8 · High EPSS 0.10% · P1

Affected Version Matrix 24

VendorProduct Version RangeStatus
Linux Linux da5c6b8ae47e414be47e5e04def15b25d5c962dc< 91e4ff8d966978901630fc29582c1a76d3c6e46c affected
5dae6b36a7cb7a4fcf4121b95e9ca7f96f816c8a< 3d94323c80d7fc4da5f10f9bb06a45d39d5d3cc4 affected
c43d0e787cbba569ec9d11579ed370b50fab6c9c< 721eb342d9ba19bad5c4815ea3921465158b7362 affected
11ba9f0dc865136174cb98834280fb21bbc950c7< 19c7d8ac51988d053709c1e85bd8482076af845d affected
986967a162142710076782d5b93daab93a892980< a1f686d273d129b45712d95f4095843b864466bd affected
cdedcd5aa3f3cb8b7ae0f87ab3a936d0bd583d66< d34f7a8aa9a25b7e64e0e46e444697c0f702374d affected
f8db6475a83649689c087a8f52486fcc53e627e9< 1e58ae87ad1e6e24368dea9aec9048c758cd0e2b affected
f8db6475a83649689c087a8f52486fcc53e627e9< e3f000f0dee1bfab52e2e61ca6a3835d9e187e35 affected
… +16 more rows
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I. Basic Information for CVE-2026-23273

Vulnerability Information
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Vulnerability Title
macvlan: observe an RCU grace period in macvlan_common_newlink() error path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: macvlan: observe an RCU grace period in macvlan_common_newlink() error path valis reported that a race condition still happens after my prior patch. macvlan_common_newlink() might have made @dev visible before detecting an error, and its caller will directly call free_netdev(dev). We must respect an RCU period, either in macvlan or the core networking stack. After adding a temporary mdelay(1000) in macvlan_forward_source_one() to open the race window, valis repro was: 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 &) ; sleep 0.5 ; ping -c1 -I p1 1.2.3.4 PING 1.2.3.4 (1.2.3.4): 56 data bytes RTNETLINK answers: Invalid argument BUG: KASAN: slab-use-after-free in macvlan_forward_source (drivers/net/macvlan.c:408 drivers/net/macvlan.c:444) Read of size 8 at addr ffff888016bb89c0 by task e/175 CPU: 1 UID: 1000 PID: 175 Comm: e Not tainted 6.19.0-rc8+ #33 NONE Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014 Call Trace: <IRQ> dump_stack_lvl (lib/dump_stack.c:123) print_report (mm/kasan/report.c:379 mm/kasan/report.c:482) ? macvlan_forward_source (drivers/net/macvlan.c:408 drivers/net/macvlan.c:444) kasan_report (mm/kasan/report.c:597) ? macvlan_forward_source (drivers/net/macvlan.c:408 drivers/net/macvlan.c:444) macvlan_forward_source (drivers/net/macvlan.c:408 drivers/net/macvlan.c:444) ? tasklet_init (kernel/softirq.c:983) macvlan_handle_frame (drivers/net/macvlan.c:501) Allocated by task 169: kasan_save_stack (mm/kasan/common.c:58) kasan_save_track (./arch/x86/include/asm/current.h:25 mm/kasan/common.c:70 mm/kasan/common.c:79) __kasan_kmalloc (mm/kasan/common.c:419) __kvmalloc_node_noprof (./include/linux/kasan.h:263 mm/slub.c:5657 mm/slub.c:7140) alloc_netdev_mqs (net/core/dev.c:12012) rtnl_create_link (net/core/rtnetlink.c:3648) rtnl_newlink (net/core/rtnetlink.c:3830 net/core/rtnetlink.c:3957 net/core/rtnetlink.c:4072) rtnetlink_rcv_msg (net/core/rtnetlink.c:6958) netlink_rcv_skb (net/netlink/af_netlink.c:2550) netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344) netlink_sendmsg (net/netlink/af_netlink.c:1894) __sys_sendto (net/socket.c:727 net/socket.c:742 net/socket.c:2206) __x64_sys_sendto (net/socket.c:2209) do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:131) Freed by task 169: kasan_save_stack (mm/kasan/common.c:58) kasan_save_track (./arch/x86/include/asm/current.h:25 mm/kasan/common.c:70 mm/kasan/common.c:79) kasan_save_free_info (mm/kasan/generic.c:587) __kasan_slab_free (mm/kasan/common.c:287) kfree (mm/slub.c:6674 mm/slub.c:6882) rtnl_newlink (net/core/rtnetlink.c:3845 net/core/rtnetlink.c:3957 net/core/rtnetlink.c:4072) rtnetlink_rcv_msg (net/core/rtnetlink.c:6958) netlink_rcv_skb (net/netlink/af_netlink.c:2550) netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344) netlink_sendmsg (net/netlink/af_netlink.c:1894) __sys_sendto (net/socket.c:727 net/socket.c:742 net/socket.c:2206) __x64_sys_sendto (net/socket.c:2209) do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:131)
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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错误路径中缺少RCU宽限期，可能导致释放后重用问题。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux da5c6b8ae47e414be47e5e04def15b25d5c962dc ~ 91e4ff8d966978901630fc29582c1a76d3c6e46c -
Linux Linux 6.19 -

II. Public POCs for CVE-2026-23273

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III. Intelligence Information for CVE-2026-23273

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Patches & Fixes for CVE-2026-23273 (8)

Same Patch Batch · Linux · 2026-03-20 · 8 CVEs total

CVE-2026-23278 7.8 HIGH netfilter: nf_tables: always walk all pending catchall elements
CVE-2026-23275 7.8 HIGH io_uring: ensure ctx->rings is stable for task work flags manipulation
CVE-2026-23274 7.8 HIGH netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels
CVE-2026-23272 7.8 HIGH netfilter: nf_tables: unconditionally bump set->nelems before insertion
CVE-2026-23271 7.8 HIGH perf: Fix __perf_event_overflow() vs perf_remove_from_context() race
CVE-2026-23276 net: add xmit recursion limit to tunnel xmit functions
CVE-2026-23277 net/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23273

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