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CVE-2026-90023— usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers()

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： usb: gadget: f_mass_storage: 修复 fsg_common_set_num_buffers() 中的空指针解引用问题 此前，fsg_num_buffers_validate() 函数被移除，因为通过 Kconfig 已对 n 的取值范围设置了限制（范围为 2 到 256，默认值为 2）。然而，如果以特定方式设置页内容，使得 kstrtou8() 解析出的 n 值为 0 或 1，则会绕过上述限制，从而导致当 n 为 0 时发生空指针解引用。为修复

AI Predicted 5.5 Difficulty: Hard EPSS 0.22% · P11

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux fe5a6c48fd954489f51aab151d5dad9254c76419< 51cc9af4f2d3f0b765266aced66b9b532b423b13 affected
fe5a6c48fd954489f51aab151d5dad9254c76419< 9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957 affected
fe5a6c48fd954489f51aab151d5dad9254c76419< b9b5b5df5b8dd3c1572ed267200276a44cc67d8e affected
fe5a6c48fd954489f51aab151d5dad9254c76419< 2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc affected
4.8 affected
< 4.8 unaffected
6.12.112≤ 6.12.* unaffected
6.18.52≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-90023

Vulnerability Information
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Vulnerability Title
usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers() Previously fsg_num_buffers_validate() was removed as it was not necessary due to Kconfig setting the limits for n from 2 to 256 with default as 2. However, setting the page content in such a way that kstrtou8() reflects n value as either 0 or 1 bypasses these restrictions leading to a null pointer dereference if n is 0. Fix this by adding a check for n < 2 and returning -EINVAL if n is either 0 or 1 consistent with Kconfig logic.
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 fe5a6c48fd954489f51aab151d5dad9254c76419 ~ 51cc9af4f2d3f0b765266aced66b9b532b423b13 -
Linux Linux 4.8 -

II. Public POCs for CVE-2026-90023

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III. Intelligence Information for CVE-2026-90023

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Patches & Fixes for CVE-2026-90023 (1)

Other References for CVE-2026-90023 (3)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-90048 9.8 CRITICAL fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
CVE-2026-90012 9.8 CRITICAL spi: Fix DMA mapping ownership on partial map failure
CVE-2026-89970 9.8 CRITICAL nvmet-auth: Synchronize timeout work during SQ teardown
CVE-2026-89857 9.8 CRITICAL scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject
CVE-2026-89969 9.8 CRITICAL nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
CVE-2026-89847 9.8 CRITICAL scsi: qla2xxx: Avoid double completion in async IOCB timeout
CVE-2026-89972 9.8 CRITICAL nvme: add missing SRCU grace period in error path
CVE-2026-89990 9.8 CRITICAL ceph: lock mutex in ceph_mds_check_access()
CVE-2026-90036 9.8 CRITICAL NFSD: Prevent client use-after-free during blocked-lock reaping
CVE-2026-90038 9.8 CRITICAL NFSD: Prevent client use-after-free during export state revocation
CVE-2026-90037 9.8 CRITICAL NFSD: Prevent client use-after-free during close_lru reaping
CVE-2026-89788 9.8 CRITICAL ksmbd: fix tree connection use-after-free in smb2_tree_connect()
CVE-2026-89783 9.8 CRITICAL xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
CVE-2026-90042 9.8 CRITICAL ceph: properly decrypt filenames in vmalloc() buffers
CVE-2026-89778 9.8 CRITICAL isofs: fix out-of-bounds page array access on empty zisofs block
CVE-2026-89916 9.3 CRITICAL KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry
CVE-2026-89915 9.3 CRITICAL KVM: arm64: Remove VM-wide VNCR mapping counter
CVE-2026-90049 9.3 CRITICAL net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
CVE-2026-89775 9.3 CRITICAL KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation
CVE-2026-89918 9.3 CRITICAL KVM: arm64: Correctly handle end of VA space TLBI invalidation

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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