CVE-2026-52925vrf: Fix a potential NPD when removing a port from a VRF
Updated under an hour ago ()
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In the Linux kernel, the following vulnerability has been resolved: vrf: Fix a potential NPD when removing a port from a VRF RCU readers that identified a net device as a VRF port using netif_is_l3_slave() assume that a subsequent call to netdev_master_upper_dev_get_rcu() will return a VRF device. They then continue to dereference its l3mdev operations. This assumption is not always correct and can result in a NPD [1]. There is no RCU synchronization when removing a port from a VRF, so it is possible for an RCU reader to see a new master device (e.g., a bridge) that does not have l3mdev operations. Fix by adding RCU synchronization after clearing the IFF_L3MDEV_SLAVE flag. Skip this synchronization when a net device is removed from a VRF as part of its deletion and when the VRF device itself is deleted. In the latter case an RCU grace period will pass by the time RTNL is released. [1] BUG: kernel NULL pointer dereference, address: 0000000000000000 [...] RIP: 0010:l3mdev_fib_table_rcu (net/l3mdev/l3mdev.c:181) [...] Call Trace: <TASK> l3mdev_fib_table_by_index (net/l3mdev/l3mdev.c:201 net/l3mdev/l3mdev.c:189) __inet_bind (net/ipv4/af_inet.c:499 (discriminator 3)) inet_bind_sk (net/ipv4/af_inet.c:469) __sys_bind (./include/linux/file.h:62 (discriminator 1) ./include/linux/file.h:83 (discriminator 1) net/socket.c:1951 (discriminator 1)) __x64_sys_bind (net/socket.c:1969 (discriminator 1) net/socket.c:1967 (discriminator 1) net/socket.c:1967 (discriminator 1)) do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1)) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Jun 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from fdeea7be88b12742bfd50d9e19a06c0d2e702400 before 2c022f582fd16a470df6ed9e7fb7e9fc48946d49; from fdeea7be88b12742bfd50d9e19a06c0d2e702400 before 4ab6fc60ed5a0344b60711b09bff1dc238d8d6a4; from fdeea7be88b12742bfd50d9e19a06c0d2e702400 before 468defa0b70902a22f4478c1207624bc1b31c124; from fdeea7be88b12742bfd50d9e19a06c0d2e702400 before 3db8d078f7f652379ee394132b169d304f6eb4c1; from fdeea7be88b12742bfd50d9e19a06c0d2e702400 before 8c2b792f04a3db97c9d8d2a45817e93f8884baf5; from fdeea7be88b12742bfd50d9e19a06c0d2e702400 before a7a97f2303e63ede105c1d55ef53dc497364e11d; from fdeea7be88b12742bfd50d9e19a06c0d2e702400 before d47204c127992da0c976ac9747070a575912e0fe; from fdeea7be88b12742bfd50d9e19a06c0d2e702400 before 2674d603a9e6970463b2b9ebcf8e31e90beae169 | CNA record |
linux linux_kernel linux:linux_kernel | from 4.12 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/2c022f582fd16a470df6ed9e7fb7e9fc48946d49patch
- https://git.kernel.org/stable/c/4ab6fc60ed5a0344b60711b09bff1dc238d8d6a4patch
- https://git.kernel.org/stable/c/468defa0b70902a22f4478c1207624bc1b31c124patch
- https://git.kernel.org/stable/c/3db8d078f7f652379ee394132b169d304f6eb4c1patch
- https://git.kernel.org/stable/c/8c2b792f04a3db97c9d8d2a45817e93f8884baf5patch
- https://git.kernel.org/stable/c/a7a97f2303e63ede105c1d55ef53dc497364e11dpatch
- https://git.kernel.org/stable/c/d47204c127992da0c976ac9747070a575912e0fepatch
- https://git.kernel.org/stable/c/2674d603a9e6970463b2b9ebcf8e31e90beae169patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.