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CVE-2026-23221— bus: fsl-mc: fix use-after-free in driver_override_show()

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.

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，该漏洞源于未在读取时持有设备锁，可能导致释放后重用。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d< c71dfb7833db7af652ee8f65011f14c97c47405d affected
1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d< c424e72cfa67e7e1477035058a8a659f2c0ea637 affected
1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d< b1983840287303e0dfb401b1b6cecc5ea7471e90 affected
1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d< dd8ba8c0c3f3916d4ee1e3a09da9cd5caff5d227 affected
1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d< 1d6bd6183e723a7b256ff34bbb5b498b5f4f2ec0 affected
1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d< a2ae33e1c6361e960a4d00f7cf75d880b54f9528 affected
1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d< 148891e95014b5dc5878acefa57f1940c281c431 affected
5.10 affected
… +8 more rows
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I. Basic Information for CVE-2026-23221

Vulnerability Information
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Vulnerability Title
bus: fsl-mc: fix use-after-free in driver_override_show()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bus: fsl-mc: fix use-after-free in driver_override_show() The driver_override_show() function reads the driver_override string without holding the device_lock. However, driver_override_store() uses driver_set_override(), which modifies and frees the string while holding the device_lock. This can result in a concurrent use-after-free if the string is freed by the store function while being read by the show function. Fix this by holding the device_lock around the read operation.
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
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，该漏洞源于未在读取时持有设备锁，可能导致释放后重用。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d ~ c71dfb7833db7af652ee8f65011f14c97c47405d -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-23221

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III. Intelligence Information for CVE-2026-23221

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

CVE-2026-23230 8.8 HIGH smb: client: split cached_fid bitfields to avoid shared-byte RMW races
CVE-2026-23226 8.8 HIGH ksmbd: add chann_lock to protect ksmbd_chann_list xarray
CVE-2025-71234 8.8 HIGH wifi: rtl8xxxu: fix slab-out-of-bounds in rtl8xxxu_sta_add
CVE-2026-23227 7.8 HIGH drm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to
CVE-2026-23225 7.8 HIGH sched/mmcid: Don't assume CID is CPU owned on mode switch
CVE-2026-23224 7.8 HIGH erofs: fix UAF issue for file-backed mounts w/ directio option
CVE-2026-23222 7.8 HIGH crypto: omap - Allocate OMAP_CRYPTO_FORCE_COPY scatterlists correctly
CVE-2025-71236 7.5 HIGH scsi: qla2xxx: Validate sp before freeing associated memory
CVE-2025-71233 PCI: endpoint: Avoid creating sub-groups asynchronously
CVE-2026-23229 crypto: virtio - Add spinlock protection with virtqueue notification
CVE-2026-23228 smb: server: fix leak of active_num_conn in ksmbd_tcp_new_connection()
CVE-2026-23223 xfs: fix UAF in xchk_btree_check_block_owner
CVE-2026-23220 ksmbd: fix infinite loop caused by next_smb2_rcv_hdr_off reset in error paths
CVE-2025-71237 nilfs2: Fix potential block overflow that cause system hang
CVE-2025-71235 scsi: qla2xxx: Delay module unload while fabric scan in progress
CVE-2026-23211 mm, swap: restore swap_space attr aviod kernel panic
CVE-2025-71232 scsi: qla2xxx: Free sp in error path to fix system crash
CVE-2025-71231 crypto: iaa - Fix out-of-bounds index in find_empty_iaa_compression_mode
CVE-2025-71230 hfs: ensure sb->s_fs_info is always cleaned up
CVE-2025-71229 wifi: rtw88: Fix alignment fault in rtw_core_enable_beacon()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23221

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