net: bcmgenet: fix NULL dereference in set_coalesce before first open
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.
CVE-2026-98798
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98798
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "9f4ca05827a27ec73bf63a42732f1978b8a779af",
"lessThan": "213ff02ab26a4543ef02b4db393bbdd5fa5679a7",
"versionType": "git"
},
{
"status": "affected",
"version": "9f4ca05827a27ec73bf63a42732f1978b8a779af",
"lessThan": "0d867b91598b6ed2f75998c34f4e2869631da31e",
"versionType": "git"
},
{
"status": "affected",
"version": "9f4ca05827a27ec73bf63a42732f1978b8a779af",
"lessThan": "2294b62eaec6fd3c76a261d287f66641eeafd5f0",
"versionType": "git"
},
{
"status": "affected",
"version": "9f4ca05827a27ec73bf63a42732f1978b8a779af",
"lessThan": "d870102b5425390cab42eebbf3d19ec6a43c6734",
"versionType": "git"
},
{
"status": "affected",
"version": "9f4ca05827a27ec73bf63a42732f1978b8a779af",
"lessThan": "19419faf58dfe5bcc8a9e60e622976c5f8e3ddc1",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/ethernet/broadcom/genet/bcmgenet.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/ethernet/broadcom/genet/bcmgenet.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98798
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48984 · Revision 1
- Added to Heist Feed
- Publisher date