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CVE-2026-93811— ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling

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： ksmbd：修复 acl.sd_buf 内存泄漏及无效的 sd_size 错误处理 1. 当 调用失败时，代码跳转至 标签，该标签仅释放了 ，而跳过了 ，导致缓冲区泄漏。对此，对 结构体进行零初始化，并重新排列错误处理标签为 ，以确保在所有错误路径上均能正确释放 。 2. 当条件 成立时，原始代码在未释放 的情况下返回成功状态，导致 残留无效数据。对此，在跳转至 之前将 设置为 ，从而正确返回错误码并释放缓冲区。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P6

Affected Version Matrix 19

VendorProduct Version RangeStatus
Linux Linux cb69d4d6f709f87c94afa28ae64c501576692171< f46a70a082bdbfecbe074af8a719c26c4deb58c6 affected
8f0541186e9ad1b62accc9519cc2b7a7240272a7< 86c2625fb9863139b359805fc6be1e31edbd3d65 affected
8f0541186e9ad1b62accc9519cc2b7a7240272a7< edc17db83085624a2b1bacf6a4521d7f15571737 affected
8f0541186e9ad1b62accc9519cc2b7a7240272a7< c3836f55e0dab96314774215e12d87f63fa919f2 affected
8f0541186e9ad1b62accc9519cc2b7a7240272a7< 6e6329322ad733c5b23555c609353841560b26bc affected
8f0541186e9ad1b62accc9519cc2b7a7240272a7< d708a36634bb7b6f94d0e76d587d2ec50b2b93b5 affected
6e8f4abf584253cbaa596ea4ad13110cf61cd4c9 affected
8e33102309bd6839b2e2e158f93a7b378cb4655d affected
… +11 more rows
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I. Basic Information for CVE-2026-93811

Vulnerability Information
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Vulnerability Title
ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling 1. When ndr_decode_v4_ntacl() fails, the code jumped to free_n_data which only freed n.data, skipping kfree(acl.sd_buf) and leaking the buffer. Zero-initialize struct xattr_ntacl acl, reorder error labels to out_free to release acl.sd_buf on all error paths. 2. if (acl.sd_size < sizeof(struct smb_ntsd)) is true, original code returned success without freeing sd_buf and left stale *pntsd. Set rc = -EINVAL before jumping to out_free to return error code and free buffer.
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 cb69d4d6f709f87c94afa28ae64c501576692171 ~ f46a70a082bdbfecbe074af8a719c26c4deb58c6 -
Linux Linux 6.0 -

II. Public POCs for CVE-2026-93811

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III. Intelligence Information for CVE-2026-93811

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Patches & Fixes for CVE-2026-93811 (6)

Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total

CVE-2026-93207 9.8 CRITICAL SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry
CVE-2026-97413 9.8 CRITICAL RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
CVE-2026-93228 9.1 CRITICAL svcrdma: Reject Write/Reply chunks with segcount 0
CVE-2026-93793 8.8 HIGH wifi: iwlwifi: mvm: validate TX_CMD response layout
CVE-2026-93790 8.8 HIGH wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif
CVE-2026-93799 8.8 HIGH wifi: iwlwifi: mvm: validate sta_id in BA window status notif
CVE-2026-97442 8.8 HIGH wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi
CVE-2026-93806 8.8 HIGH wifi: cfg80211: validate assoc response length before status and IE access
CVE-2026-97509 8.8 HIGH thunderbolt: Keep XDomain reference during the lifetime of a service
CVE-2026-97409 8.8 HIGH nvme-fc: Do not cancel requests in io target before it is initialized
CVE-2026-93280 8.8 HIGH greybus: audio: bound the topology section sizes against the fetched size
CVE-2026-93284 8.8 HIGH drm/pagemap: dma-unmap pages before handling migration errors
CVE-2026-97451 8.4 HIGH ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
CVE-2026-97452 8.4 HIGH ACPICA: Prevent adding invalid references
CVE-2026-97455 8.4 HIGH ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
CVE-2026-97450 8.4 HIGH ACPICA: validate handler object type in two places
CVE-2026-93827 8.4 HIGH virtio-fs: avoid double-free on failed queue setup
CVE-2026-97433 8.2 HIGH nvme: validate FDP configuration descriptor sizes
CVE-2026-93224 8.1 HIGH svcrdma: Fix unmatched rn_unregister on failed accept
CVE-2026-93787 8.1 HIGH smb: client: bound dirent name against end of SMB response in cifs_filldir

Showing top 20 of 234 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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