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CVE-2026-23225— sched/mmcid: Don't assume CID is CPU owned on mode switch

CVSS 7.8 · High EPSS 0.02% · P5
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I. Basic Information for CVE-2026-23225

Vulnerability Information
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Vulnerability Title
sched/mmcid: Don't assume CID is CPU owned on mode switch
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sched/mmcid: Don't assume CID is CPU owned on mode switch Shinichiro reported a KASAN UAF, which is actually an out of bounds access in the MMCID management code. CPU0 CPU1 T1 runs in userspace T0: fork(T4) -> Switch to per CPU CID mode fixup() set MM_CID_TRANSIT on T1/CPU1 T4 exit() T3 exit() T2 exit() T1 exit() switch to per task mode ---> Out of bounds access. As T1 has not scheduled after T0 set the TRANSIT bit, it exits with the TRANSIT bit set. sched_mm_cid_remove_user() clears the TRANSIT bit in the task and drops the CID, but it does not touch the per CPU storage. That's functionally correct because a CID is only owned by the CPU when the ONCPU bit is set, which is mutually exclusive with the TRANSIT flag. Now sched_mm_cid_exit() assumes that the CID is CPU owned because the prior mode was per CPU. It invokes mm_drop_cid_on_cpu() which clears the not set ONCPU bit and then invokes clear_bit() with an insanely large bit number because TRANSIT is set (bit 29). Prevent that by actually validating that the CID is CPU owned in mm_drop_cid_on_cpu().
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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，该漏洞源于在模式切换时错误假设CID由CPU拥有，可能导致越界访问。
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 007d84287c7466ca68a5809b616338214dc5b77b ~ 81f29975631db8a78651b3140ecd0f88ffafc476 -
LinuxLinux 6.19 -

II. Public POCs for CVE-2026-23225

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III. Intelligence Information for CVE-2026-23225

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

CVE-2026-232308.8 HIGHsmb: client: split cached_fid bitfields to avoid shared-byte RMW races
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-2026-232247.8 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-2026-23225

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