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CVE-2026-92494— ext4: fix buffer_head leak in ext4_init_orphan_info

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，以下漏洞已得到修复： ext4：修复 ext4_init_orphan_info 中的 buffer_head 内存泄漏 通过 读取孤儿文件（orphan file）的数据块，并将返回的 存储在 中。 当 成功，但孤儿块的魔术字（magic）或校验和（checksum）验证失败时，函数会跳转到 标签。然而，原有的 清理循环从索引 开始释放缓冲区，导致当前索引 处的 被跳过，未得到释放。 这导致在魔术字错误和校验和错误的处理路径上， 获取的 引用发生泄漏。 修复方法：通过跟踪成功读取的 数量，

AI Predicted 5.5 Difficulty: Hard EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1613 · Container and Resource Discovery

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37< a9a6ec1298f9bc134b2c5db27d25bb10603b7113 affected
02f310fcf47fa9311d6ba2946a8d19e7d7d11f37< 35fc83c65faf7949f5701bb34b20f822560a7718 affected
02f310fcf47fa9311d6ba2946a8d19e7d7d11f37< 74637f7fef030e5fb2e835b7dfeb05efdc48e0fe affected
02f310fcf47fa9311d6ba2946a8d19e7d7d11f37< 6ec53ccab0d691b3c73e03d930343ca45987e88d affected
02f310fcf47fa9311d6ba2946a8d19e7d7d11f37< 1399f102d8a1855c1a38506057306ec79d0787d9 affected
02f310fcf47fa9311d6ba2946a8d19e7d7d11f37< e1e342d9a561c016b8531ec1f4dcefaad9d64954 affected
02f310fcf47fa9311d6ba2946a8d19e7d7d11f37< 05704335803b69c1bfa8637b7ada942bf2ee8a41 affected
5.15 affected
… +8 more rows
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I. Basic Information for CVE-2026-92494

Vulnerability Information
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Vulnerability Title
ext4: fix buffer_head leak in ext4_init_orphan_info
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix buffer_head leak in ext4_init_orphan_info ext4_init_orphan_info() reads orphan file blocks with ext4_bread() and stores the returned buffer_head in oi->of_binfo[i].ob_bh. If ext4_bread() succeeds but the orphan block magic or checksum validation fails, the function jumps to out_free. However, the old out_free loop starts releasing buffers from i - 1, so the current buffer_head at index i is skipped. This leaks the buffer_head reference obtained by ext4_bread() on the bad magic and bad checksum error paths. Fix this by tracking the number of successfully read buffer_heads and releasing exactly those buffer_heads on the error path.
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 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 ~ a9a6ec1298f9bc134b2c5db27d25bb10603b7113 -
Linux Linux 5.15 -

II. Public POCs for CVE-2026-92494

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III. Intelligence Information for CVE-2026-92494

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Patches & Fixes for CVE-2026-92494 (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-2026-90235 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-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
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-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
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-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID

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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