CVE-2026-98798net: bcmgenet: fix NULL dereference in set_coalesce before first open
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 93% 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: bcmgenet: fix NULL dereference in set_coalesce before first open The Rx ring priv and index are only set in bcmgenet_init_rx_ring(), which runs at open. Setting the Rx coalescing parameters on an interface that was never opened, e.g. "ethtool -C eth0 rx-usecs 50", dereferences a NULL ring->priv. The oops happens with RTNL held, so networking stays stuck until a reboot: Unable to handle kernel paging request at virtual address 0000000000002788 pc : bcmgenet_set_rx_coalesce.isra.0+0x10/0x88 lr : bcmgenet_set_coalesce+0xe8/0x180 Call trace: bcmgenet_set_rx_coalesce.isra.0+0x10/0x88 (P) __ethnl_set_coalesce.isra.0+0x490/0x570 ethnl_set_coalesce+0x48/0xc0 ethnl_default_set_doit+0xf4/0x230 genl_family_rcv_msg_doit+0xe8/0x160 genl_rcv_msg+0x220/0x2a0 netlink_rcv_skb+0x68/0x140 genl_rcv+0x40/0x60 netlink_unicast+0x338/0x3c0 netlink_sendmsg+0x19c/0x3f8 __sock_sendmsg+0x64/0xc0 __sys_sendto+0x124/0x198 __arm64_sys_sendto+0x30/0x48 Set priv and index at probe. Writing the registers while the interface is down is harmless because open resets the MAC and bcmgenet_init_rx_coalesce() reapplies the stored values. It was observed on a Raspberry Pi CM4, but should apply to all other genet devices.
Timeline
ID reserved
By Linux
- 23 days later
· 23 days later
Published
- 12 days later
· 12 days 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
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 9f4ca05827a27ec73bf63a42732f1978b8a779af – < 51e76b4113e5147329ed8dd232375bf11fd34044
- affected 9f4ca05827a27ec73bf63a42732f1978b8a779af – < 213ff02ab26a4543ef02b4db393bbdd5fa5679a7
- affected 9f4ca05827a27ec73bf63a42732f1978b8a779af – < 0d867b91598b6ed2f75998c34f4e2869631da31e
- affected 9f4ca05827a27ec73bf63a42732f1978b8a779af – < 2294b62eaec6fd3c76a261d287f66641eeafd5f0
- affected 9f4ca05827a27ec73bf63a42732f1978b8a779af – < d870102b5425390cab42eebbf3d19ec6a43c6734
- affected 9f4ca05827a27ec73bf63a42732f1978b8a779af – < 19419faf58dfe5bcc8a9e60e622976c5f8e3ddc1
- affected 4.17
- unaffected < 4.17
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.113 – ≤ 6.12.*
- unaffected 6.18.56 – ≤ 6.18.*
- unaffected 7.2.10 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/51e76b4113e5147329ed8dd232375bf11fd34044 (opens in a new tab)
- https://git.kernel.org/stable/c/213ff02ab26a4543ef02b4db393bbdd5fa5679a7 (opens in a new tab)
- https://git.kernel.org/stable/c/0d867b91598b6ed2f75998c34f4e2869631da31e (opens in a new tab)
- https://git.kernel.org/stable/c/2294b62eaec6fd3c76a261d287f66641eeafd5f0 (opens in a new tab)
- https://git.kernel.org/stable/c/d870102b5425390cab42eebbf3d19ec6a43c6734 (opens in a new tab)
- https://git.kernel.org/stable/c/19419faf58dfe5bcc8a9e60e622976c5f8e3ddc1 (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-2026-103883 (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-2026-98798)Record last updated .