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CVE-2026-90103— NFSv4.2: fix LAYOUTSTATS send buffer exhaustion

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： NFSv4.2：修复 LAYOUTSTATS 发送缓冲区耗尽问题 为布局驱动程序写入的 主体预留了 的预算，即 256 字节。然而，flexfiles 记录可能会超过这个大小。 会为每个数据服务器依次编码以下字段： 一个 一个 两个 一个 一个 如果一个数据服务器的文件句柄长度为 字节（128 字节），那么仅文件句柄就占了 132 字节中的大部分；两个 （每个 64 字节）加上 和 又额外占用 144 字节。因此，在编码 之前，主体部分就已超过 256 字节的预留空间。此外

CVSS 7.5 · High EPSS 0.70% · P52

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 27c430644369ccd9a2272492ba6d0e85e2e4800b< 842ac26615424577f24f0486b9d3bf97f28fad9c affected
27c430644369ccd9a2272492ba6d0e85e2e4800b< 397aa7000bbf6b6a0d32e66a544e978fb478c8e4 affected
27c430644369ccd9a2272492ba6d0e85e2e4800b< e82d7d999fe9f893f84bf332fd39cb5d9de7128f affected
27c430644369ccd9a2272492ba6d0e85e2e4800b< 5aca000630c0fd0da102ae1abf9245dd74f2ce36 affected
27c430644369ccd9a2272492ba6d0e85e2e4800b< cb11590c7ddc6883a1b1d70b1f98b2779fe626f2 affected
27c430644369ccd9a2272492ba6d0e85e2e4800b< 3815b894b922e9b4f40b8b6f6d67bf80d44141c9 affected
27c430644369ccd9a2272492ba6d0e85e2e4800b< a973622da0c62c34043ddbbf382cd761b03e5136 affected
27c430644369ccd9a2272492ba6d0e85e2e4800b< c75ef2137e749f2673f0617cfdaae53b2bb7195a affected
… +10 more rows
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I. Basic Information for CVE-2026-90103

Vulnerability Information
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Vulnerability Title
NFSv4.2: fix LAYOUTSTATS send buffer exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: NFSv4.2: fix LAYOUTSTATS send buffer exhaustion encode_layoutstats_maxsz budgets XDR_QUADLEN(PNFS_LAYOUTSTATS_MAXSIZE), i.e. 256 bytes, for the layoutupdate4 body written by the layout driver. The flexfiles record can exceed that. ff_layout_encode_ff_layoutupdate() emits, per data server, a netaddr4, an nfs_fh4, two ff_io_latency4, an nfstime4 and a bool. A data server whose filehandle is NFS_MAXFHSIZE bytes long already accounts for 132 of those bytes, and the two ff_io_latency4 at 64 bytes each, the nfstime4 and the bool add a further 144, so the body passes 256 bytes before the netaddr4 is encoded at all. encode_layoutstats() additionally writes the deviceid4 and the layoutupdate4 lou_type word, neither of which the macro accounts for. The filehandle and the address are both chosen by the server, through LAYOUTGET and GETDEVICEINFO, so it can drive the encoder past the end of the send buffer. xdr_reserve_space() returns NULL once that happens, and the two ff_layout_encode_io_latency() calls run with dss_info->mirror->lock held, so a NULL return there leaves the lock permanently held. Raise PNFS_LAYOUTSTATS_MAXSIZE to 384 so that the record fits inside the reservation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 27c430644369ccd9a2272492ba6d0e85e2e4800b ~ 842ac26615424577f24f0486b9d3bf97f28fad9c -
Linux Linux 4.2 -

II. Public POCs for CVE-2026-90103

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III. Intelligence Information for CVE-2026-90103

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Patches & Fixes for CVE-2026-90103 (8)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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