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CVE-2026-90318— fat: release buffer head after rebuilding parent

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，以下漏洞已修复： fat：在重建父目录节点后释放缓冲区头（buffer head） 会将匹配目录项的缓冲区头（ ）保留，交由调用者负责释放，其行为与 保持一致。 在用于 的 NFS 导出路径中，利用该目录项重建父目录的 inode，但在扫描成功后未释放 。应在 消费完目录项数据后，及时释放该缓冲区头。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1059.004 · Unix Shell

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f1e6fb0ab451dae8523fbb8c119a653b2730e938< 5e44b6944e11fd6647f028219ad0be4e85e9acee affected
f1e6fb0ab451dae8523fbb8c119a653b2730e938< d2a86329152c69a6200c15b2bf618755f8563826 affected
f1e6fb0ab451dae8523fbb8c119a653b2730e938< 0f18d712ba9c980e05b7e33a27cde4fe3ed2d393 affected
f1e6fb0ab451dae8523fbb8c119a653b2730e938< e38587d98d1ceac608420052c0cdd901d25878f3 affected
f1e6fb0ab451dae8523fbb8c119a653b2730e938< c6a67aa438179cad40f8ae45469e304338d65c0a affected
f1e6fb0ab451dae8523fbb8c119a653b2730e938< 571ea4263d69df1b48578e4314a828ecd0604755 affected
f1e6fb0ab451dae8523fbb8c119a653b2730e938< 7565e44507634514e3e1899d3acad3de43f7a2c1 affected
f1e6fb0ab451dae8523fbb8c119a653b2730e938< 83e98dbf19ab64e8528e101e20f8d50e1aaa68a8 affected
… +10 more rows
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I. Basic Information for CVE-2026-90318

Vulnerability Information
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Vulnerability Title
fat: release buffer head after rebuilding parent
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fat: release buffer head after rebuilding parent fat_scan_logstart() leaves the matching directory entry's buffer head in sinfo.bh for the caller to release, just like fat_scan(). fat_rebuild_parent() uses the directory entry to rebuild the parent inode for the nostale_ro NFS export path, but does not release sinfo.bh after a successful scan. Release it once fat_build_inode() has consumed the directory entry data.
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 f1e6fb0ab451dae8523fbb8c119a653b2730e938 ~ 5e44b6944e11fd6647f028219ad0be4e85e9acee -
Linux Linux 3.10 -

II. Public POCs for CVE-2026-90318

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III. Intelligence Information for CVE-2026-90318

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Patches & Fixes for CVE-2026-90318 (7)

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

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
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-2026-90110 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-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
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

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90318

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