NULL Pointer Dereference Affecting libperf package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CENTOS10-LIBPERF-18394704
- published30 Jul 2026
- disclosed27 Jul 2026
Introduced: 27 Jul 2026
NewCVE-2026-64545 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 libperf.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libperf package and not the libperf package as distributed by Centos.
See How to fix? for Centos:10 relevant fixed versions and status.
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.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2507787
- https://access.redhat.com/security/cve/CVE-2026-64545
- https://git.kernel.org/stable/c/03b743586a2469744e96e9c1015096d07240935d
- https://git.kernel.org/stable/c/3876318ea54e83eb70982b8280a3c5e4e32269bf
- https://git.kernel.org/stable/c/4edbcacca09f92b85d3951b6add11894b20a84bc
- https://git.kernel.org/stable/c/89c103d702b25ceb2d097faf854deb47b53b17ff
- https://git.kernel.org/stable/c/c99ca049e910d61ddbd28cc2c47242f2bfbb4970
- https://git.kernel.org/stable/c/e2a56441233131fe18a76001de347ecda217e40c
- https://git.kernel.org/stable/c/e82d8cc4321c373dc46e741cd2dfdaa7921fddb7