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CVE-2026-23230— smb: client: split cached_fid bitfields to avoid shared-byte RMW races

CVSS 8.8 · High EPSS 0.03% · P9
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I. Basic Information for CVE-2026-23230

Vulnerability Information
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Vulnerability Title
smb: client: split cached_fid bitfields to avoid shared-byte RMW races
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: split cached_fid bitfields to avoid shared-byte RMW races is_open, has_lease and on_list are stored in the same bitfield byte in struct cached_fid but are updated in different code paths that may run concurrently. Bitfield assignments generate byte read–modify–write operations (e.g. `orb $mask, addr` on x86_64), so updating one flag can restore stale values of the others. A possible interleaving is: CPU1: load old byte (has_lease=1, on_list=1) CPU2: clear both flags (store 0) CPU1: RMW store (old | IS_OPEN) -> reintroduces cleared bits To avoid this class of races, convert these flags to separate bool fields.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于位字段共享字节，可能导致读-修改-写竞争。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux ebe98f1447bbccf8228335c62d86af02a0ed23f7 ~ 569fecc56bfe4df66f05734d67daef887746656b -
LinuxLinux 6.1 -

II. Public POCs for CVE-2026-23230

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III. Intelligence Information for CVE-2026-23230

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Same Patch Batch · Linux · 2026-02-18 · 31 CVEs total

CVE-2026-232268.8 HIGHksmbd: add chann_lock to protect ksmbd_chann_list xarray
CVE-2026-232277.8 HIGHdrm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to
CVE-2026-232257.8 HIGHsched/mmcid: Don't assume CID is CPU owned on mode switch
CVE-2026-232247.8 HIGHerofs: fix UAF issue for file-backed mounts w/ directio option
CVE-2026-232227.8 HIGHcrypto: omap - Allocate OMAP_CRYPTO_FORCE_COPY scatterlists correctly
CVE-2025-71233PCI: endpoint: Avoid creating sub-groups asynchronously
CVE-2026-23229crypto: virtio - Add spinlock protection with virtqueue notification
CVE-2026-23228smb: server: fix leak of active_num_conn in ksmbd_tcp_new_connection()
CVE-2026-23223xfs: fix UAF in xchk_btree_check_block_owner
CVE-2026-23221bus: fsl-mc: fix use-after-free in driver_override_show()
CVE-2026-23220ksmbd: fix infinite loop caused by next_smb2_rcv_hdr_off reset in error paths
CVE-2025-71237nilfs2: Fix potential block overflow that cause system hang
CVE-2025-71236scsi: qla2xxx: Validate sp before freeing associated memory
CVE-2025-71235scsi: qla2xxx: Delay module unload while fabric scan in progress
CVE-2025-71234wifi: rtl8xxxu: fix slab-out-of-bounds in rtl8xxxu_sta_add
CVE-2026-23211mm, swap: restore swap_space attr aviod kernel panic
CVE-2025-71232scsi: qla2xxx: Free sp in error path to fix system crash
CVE-2025-71231crypto: iaa - Fix out-of-bounds index in find_empty_iaa_compression_mode
CVE-2025-71230hfs: ensure sb->s_fs_info is always cleaned up
CVE-2025-71229wifi: rtw88: Fix alignment fault in rtw_core_enable_beacon()

Showing top 20 of 31 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23230

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