CVE-2026-89698— nfsd: widen nfsd_genl_rqstp address fields to sockaddr_storage
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 Linux 内核中，已修复以下漏洞： nfsd：将 nfsd_genl_rqstp 中的地址字段扩展为 sockaddr_storage 将 和 声明为普通的 （16 字节）。当连接了 IPv6 的 NFS 客户端时， 将这些字段强制转换为 （28 字节），并读取位于偏移量 8..24 的 ，这超出了 16 字节的 sockaddr 字段末尾，越界读取了相邻的 成员。随后，16 字节的 会通过 / netlink 属性，向用户空间发送 8 字节被截断的 IPv6 地址，以及紧随其后的 8 字节 。 由于 使用了
Affected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | bd9d6a3efa9709e653aafbeb859289feccb8e70c< 03c512f22d3fbe7a3767d6df5e3d88b8e7c105e5 |
affected |
bd9d6a3efa9709e653aafbeb859289feccb8e70c< dcb69ad0dafb4a24b825183bb94055d5be8a10bd |
affected | ||
bd9d6a3efa9709e653aafbeb859289feccb8e70c< a99d720ed2a5258564e5e9d5f39f3184a030d354 |
affected | ||
6.7 |
affected | ||
< 6.7 |
unaffected | ||
6.18.51≤ 6.18.* |
unaffected | ||
7.2.4≤ 7.2.* |
unaffected | ||
7.3-rc1≤ * |
unaffected |
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I. Basic Information for CVE-2026-89698
Vulnerability Information
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Vulnerability Title
nfsd: widen nfsd_genl_rqstp address fields to sockaddr_storage
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
nfsd: widen nfsd_genl_rqstp address fields to sockaddr_storage
struct nfsd_genl_rqstp declares rq_daddr and rq_saddr as plain
"struct sockaddr" (16 bytes). When an IPv6 NFS client is connected,
nfsd_genl_rpc_status_compose_msg() casts these fields to
"struct sockaddr_in6 *" (28 bytes) and reads sin6_addr at offset 8..24,
which extends 8 bytes past the end of the 16-byte sockaddr field into
the adjacent rq_flags member. The 16-byte nla_put_in6_addr then ships 8
bytes of truncated IPv6 address followed by 8 bytes of rq_flags to
userspace via the NFSD_A_RPC_STATUS_SADDR6/DADDR6 netlink attributes.
This is reachable by any unprivileged process in the network namespace
because NFSD_CMD_RPC_STATUS_GET uses GENL_CMD_CAP_DUMP without
GENL_ADMIN_PERM.
Fix by widening rq_daddr and rq_saddr to struct sockaddr_storage so the
IPv6 casts operate within bounds, copying sizeof(struct sockaddr_storage)
bytes in the memcpy calls so the full address is captured, and
zero-initializing the genl_rqstp stack variable to prevent leaking
uninitialized tail bytes through netlink.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-89698
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-89698 (3)
Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total
| CVE-2026-89491 | ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin() | |
| CVE-2026-89477 | sctp: fix NULL deref on untransmitted RECONF completion | |
| CVE-2026-89478 | sctp: drop a chunk if its transport was removed | |
| CVE-2026-89479 | sctp: stop processing a packet once its association is deleted | |
| CVE-2026-89480 | nvme-tcp: reject a read that transferred too few bytes | |
| CVE-2026-89482 | nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone | |
| CVE-2026-89481 | nvme-tcp: fix host memory disclosure on R2T for a read command | |
| CVE-2026-89483 | nvme: zero the discard fallback page | |
| CVE-2026-89484 | lockd: fix NULL dereference on lockowner allocation failure | |
| CVE-2026-89485 | lockd: pin next file across nlm_inspect_file lock-drop | |
| CVE-2026-89486 | ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user() | |
| CVE-2026-89487 | openvswitch: only skb_tx_error() a packet we are about to drop | |
| CVE-2026-89488 | openvswitch: Fix CT limit teardown use-after-free | |
| CVE-2026-89489 | openrisc: fix arbitrary kernel memory access via or1k_atomic syscall | |
| CVE-2026-89500 | ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page | |
| CVE-2026-89497 | orangefs: skip leading spaces before parsing client debug masks | |
| CVE-2026-89498 | orangefs: fix double-free of trailer_buf on readdir copy failure | |
| CVE-2026-89499 | ring-buffer: Stop remote reader update when page swap fails | |
| CVE-2026-89496 | ocfs2: always run deallocs on copy-on-write completion | |
| CVE-2026-89501 | ring-buffer: Hold cpu_buffer::lock when resizing a subbuf |
Showing top 20 of 431 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-89773
drm/amd/display: Skip Update HDCP Config In Transition State -
CVE-2026-89772
btrfs: write-protect folios during data writeback -
CVE-2026-89771
ring-buffer: Fix subbuf resize race with ring buffer readers -
CVE-2026-89770
iomap: don't free integrity payload that doesn't exist -
CVE-2026-89769
clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_sta
Same vendor: Linux
-
CVE-2026-89773
drm/amd/display: Skip Update HDCP Config In Transition State -
CVE-2026-89772
btrfs: write-protect folios during data writeback -
CVE-2026-89771
ring-buffer: Fix subbuf resize race with ring buffer readers -
CVE-2026-89770
iomap: don't free integrity payload that doesn't exist -
CVE-2026-89769
clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_sta
V. Comments for CVE-2026-89698
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