CVE-2026-64545net, bpf: check master for NULL in xdp_master_redirect()
- 7.5HighCVSS base score
- 0.72%Exploitation in 30 daysEPSS · top 46% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 8 days later
· 8 days later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.72% · top 46% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 – < c99ca049e910d61ddbd28cc2c47242f2bfbb4970
- affected 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 – < e2a56441233131fe18a76001de347ecda217e40c
- affected 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 – < 3876318ea54e83eb70982b8280a3c5e4e32269bf
- affected 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 – < 4edbcacca09f92b85d3951b6add11894b20a84bc
- affected 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 – < 03b743586a2469744e96e9c1015096d07240935d
- affected 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 – < 89c103d702b25ceb2d097faf854deb47b53b17ff
- affected 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 – < e82d8cc4321c373dc46e741cd2dfdaa7921fddb7
- affected 5.15
- unaffected < 5.15
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References9
- https://git.kernel.org/stable/c/c99ca049e910d61ddbd28cc2c47242f2bfbb4970 (opens in a new tab)
- https://git.kernel.org/stable/c/e2a56441233131fe18a76001de347ecda217e40c (opens in a new tab)
- https://git.kernel.org/stable/c/3876318ea54e83eb70982b8280a3c5e4e32269bf (opens in a new tab)
- https://git.kernel.org/stable/c/4edbcacca09f92b85d3951b6add11894b20a84bc (opens in a new tab)
- https://git.kernel.org/stable/c/03b743586a2469744e96e9c1015096d07240935d (opens in a new tab)
- https://git.kernel.org/stable/c/89c103d702b25ceb2d097faf854deb47b53b17ff (opens in a new tab)
- https://git.kernel.org/stable/c/e82d8cc4321c373dc46e741cd2dfdaa7921fddb7 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-49596 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64545)Record last updated .