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CVE-2026-89673— nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo

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：修复 ff_encode_getdeviceinfo 中的 XDR 填充计算错误 将 的预留大小计算为 ，但其后调用的 实际写入的字节数为 。 由于这一不匹配，导致在每次 flexfile GETDEVICEINFO 响应中，声明的 长度比实际编码的数据多出 2-8 字节，从而向客户端泄漏了过期的响应页内容，并导致后续版本列表解码时的对齐错位。 应使用 对每个字符串长度进行取整，以匹配 实际写入的内容。

AI Predicted 5.0 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1011.001 · Exfiltration Over Bluetooth

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux efcae97fa425ca6db9d126e37daccf2d7225cb09< 74015b7be806ad9e21d46f7bd2831df280c6c783 affected
efcae97fa425ca6db9d126e37daccf2d7225cb09< 41ebca28e17f84293650598f86bd69532ec1a8e0 affected
efcae97fa425ca6db9d126e37daccf2d7225cb09< 62e5949f0dd5ec837af144860ff908369df4c7c9 affected
efcae97fa425ca6db9d126e37daccf2d7225cb09< 8b989aaec85e1293a871d602590c951fe44b8647 affected
6.4.16< 6.12.109 affected
6.4.16< 6.18.50 affected
6.4.16< 7.2.4 affected
6.4.16< 7.3-rc1 affected
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I. Basic Information for CVE-2026-89673

Vulnerability Information
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Vulnerability Title
nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo nfsd4_ff_encode_getdeviceinfo() computes the da_addr_body reservation as 16 + netid_len + addr_len, but the subsequent xdr_encode_opaque() calls emit 8 + round_up(netid_len, 4) + round_up(addr_len, 4) bytes. The mismatch means the declared da_addr_body length exceeds the actual encoded data by 2-8 bytes on every flexfile GETDEVICEINFO reply, leaking stale reply-page content to the client and mis-aligning the subsequent version list decode. Use xdr_align_size() for each string length to match what xdr_encode_opaque() actually writes.
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux efcae97fa425ca6db9d126e37daccf2d7225cb09 ~ 74015b7be806ad9e21d46f7bd2831df280c6c783 -
Linux Linux 6.4.16 ~ 6.12.109 -

II. Public POCs for CVE-2026-89673

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III. Intelligence Information for CVE-2026-89673

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Patches & Fixes for CVE-2026-89673 (4)

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 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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