Answer in brief
CVE-2026-52925 records a Medium severity (CVSS 5.5) vulnerability in vrf: Fix a potential NPD when removing a port from a VRF. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=fdeea7be88b12742bfd50d9e19a06c0d2e702400 <2c022f582fd16a470df6ed9e7fb7e9fc48946d49 || >=fdeea7be88b12742bfd50d9e19a06c0d2e702400 <4ab6fc60ed5a0344b60711b09bff1dc238d8d6a4 || >=fdeea7be88b12742bfd50d9e19a06c0d2e702400 <468defa0b70902a22f4478c1207624bc1b31c124 || >=fdeea7be88b12742bfd50d9e19a06c0d2e702400 <3db8d078f7f652379ee394132b169d304f6eb4c1 || >=fdeea7be88b12742bfd50d9e19a06c0d2e702400 <8c2b792f04a3db97c9d8d2a45817e93f8884baf5 || >=fdeea7be88b12742bfd50d9e19a06c0d2e702400 <a7a97f2303e63ede105c1d55ef53dc497364e11d || >=fdeea7be88b12742bfd50d9e19a06c0d2e702400 <d47204c127992da0c976ac9747070a575912e0fe || >=fdeea7be88b12742bfd50d9e19a06c0d2e702400 <2674d603a9e6970463b2b9ebcf8e31e90beae169 | 2c022f582fd16a470df6ed9e7fb7e9fc48946d49, 4ab6fc60ed5a0344b60711b09bff1dc238d8d6a4, 468defa0b70902a22f4478c1207624bc1b31c124, 3db8d078f7f652379ee394132b169d304f6eb4c1, 8c2b792f04a3db97c9d8d2a45817e93f8884baf5, a7a97f2303e63ede105c1d55ef53dc497364e11d, d47204c127992da0c976ac9747070a575912e0fe, 2674d603a9e6970463b2b9ebcf8e31e90beae169 |
| Linux/Linuxgeneric | 4.12 | Not reported |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
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)
Quoted source text, attributed separately from HOL analysis.