Answer in brief
CVE-2026-64545 records a Unknown severity vulnerability in net, bpf: check master for NULL in xdp_master_redirect(). 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.
Answer in brief
CVE-2026-64545 records a Unknown severity vulnerability in net, bpf: check master for NULL in xdp_master_redirect(). 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.
A CVSS score is not reported in the current record. 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 | >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <c99ca049e910d61ddbd28cc2c47242f2bfbb4970 || >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <e2a56441233131fe18a76001de347ecda217e40c || >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <3876318ea54e83eb70982b8280a3c5e4e32269bf || >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <4edbcacca09f92b85d3951b6add11894b20a84bc || >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <03b743586a2469744e96e9c1015096d07240935d || >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <89c103d702b25ceb2d097faf854deb47b53b17ff || >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <e82d8cc4321c373dc46e741cd2dfdaa7921fddb7 | c99ca049e910d61ddbd28cc2c47242f2bfbb4970, e2a56441233131fe18a76001de347ecda217e40c, 3876318ea54e83eb70982b8280a3c5e4e32269bf, 4edbcacca09f92b85d3951b6add11894b20a84bc, 03b743586a2469744e96e9c1015096d07240935d, 89c103d702b25ceb2d097faf854deb47b53b17ff, e82d8cc4321c373dc46e741cd2dfdaa7921fddb7 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Jul 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: net, bpf: check master for NULL in xdp_master_redirect() xdp_master_redirect() dereferences the result of netdev_master_upper_dev_get_rcu() without a NULL check, but that helper returns NULL when the receiving device has no upper-master adjacency. The reach guard only checks netif_is_bond_slave(). On bond slave release bond_upper_dev_unlink() drops the upper-master adjacency before clearing IFF_SLAVE, so an XDP_TX reaching xdp_master_redirect() in that window still passes netif_is_bond_slave() while master is already NULL, and faults on master->flags at offset 0xb0: BUG: kernel NULL pointer dereference, address: 00000000000000b0 RIP: 0010:xdp_master_redirect (net/core/filter.c:4432) Call Trace: xdp_master_redirect (net/core/filter.c:4432) bpf_prog_run_generic_xdp (include/net/xdp.h:700) do_xdp_generic (net/core/dev.c:5608) __netif_receive_skb_one_core (net/core/dev.c:6204) process_backlog (net/core/dev.c:6319) __napi_poll (net/core/dev.c:7729) net_rx_action (net/core/dev.c:7792) handle_softirqs (kernel/softirq.c:622) __dev_queue_xmit (include/linux/bottom_half.h:33) packet_sendmsg (net/packet/af_packet.c:3082) __sys_sendto (net/socket.c:2252) Kernel panic - not syncing: Fatal exception in interrupt The missing check dates back to the original code; commit 1921f91298d1 ("net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master") later added the master->flags read where the fault now lands but kept the unconditional deref. Check master for NULL before use; a NULL master is treated the same as one that is not up.
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. 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 | >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <c99ca049e910d61ddbd28cc2c47242f2bfbb4970 || >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <e2a56441233131fe18a76001de347ecda217e40c || >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <3876318ea54e83eb70982b8280a3c5e4e32269bf || >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <4edbcacca09f92b85d3951b6add11894b20a84bc || >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <03b743586a2469744e96e9c1015096d07240935d || >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <89c103d702b25ceb2d097faf854deb47b53b17ff || >=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <e82d8cc4321c373dc46e741cd2dfdaa7921fddb7 | c99ca049e910d61ddbd28cc2c47242f2bfbb4970, e2a56441233131fe18a76001de347ecda217e40c, 3876318ea54e83eb70982b8280a3c5e4e32269bf, 4edbcacca09f92b85d3951b6add11894b20a84bc, 03b743586a2469744e96e9c1015096d07240935d, 89c103d702b25ceb2d097faf854deb47b53b17ff, e82d8cc4321c373dc46e741cd2dfdaa7921fddb7 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Jul 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: net, bpf: check master for NULL in xdp_master_redirect() xdp_master_redirect() dereferences the result of netdev_master_upper_dev_get_rcu() without a NULL check, but that helper returns NULL when the receiving device has no upper-master adjacency. The reach guard only checks netif_is_bond_slave(). On bond slave release bond_upper_dev_unlink() drops the upper-master adjacency before clearing IFF_SLAVE, so an XDP_TX reaching xdp_master_redirect() in that window still passes netif_is_bond_slave() while master is already NULL, and faults on master->flags at offset 0xb0: BUG: kernel NULL pointer dereference, address: 00000000000000b0 RIP: 0010:xdp_master_redirect (net/core/filter.c:4432) Call Trace: xdp_master_redirect (net/core/filter.c:4432) bpf_prog_run_generic_xdp (include/net/xdp.h:700) do_xdp_generic (net/core/dev.c:5608) __netif_receive_skb_one_core (net/core/dev.c:6204) process_backlog (net/core/dev.c:6319) __napi_poll (net/core/dev.c:7729) net_rx_action (net/core/dev.c:7792) handle_softirqs (kernel/softirq.c:622) __dev_queue_xmit (include/linux/bottom_half.h:33) packet_sendmsg (net/packet/af_packet.c:3082) __sys_sendto (net/socket.c:2252) Kernel panic - not syncing: Fatal exception in interrupt The missing check dates back to the original code; commit 1921f91298d1 ("net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master") later added the master->flags read where the fault now lands but kept the unconditional deref. Check master for NULL before use; a NULL master is treated the same as one that is not up.
Quoted source text, attributed separately from HOL analysis.