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CVE-2026-74733— gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock

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基金会开源的一个操作系统内核。 Linux kernel 6.1.101至6.2之前版本、6.6.42至6.7之前版本、6.9.11至6.10之前版本和6.10版本存在安全漏洞，该漏洞源于pca953x_irq_bus_sync_unlock函数未持有i2c_lock，可能导致多个线程错误读写寄存器。

CVSS 7.8 · High EPSS 0.17% · P6

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux bfc6444b57dc7186b6acc964705d7516cbaf3904< bf3f37c2d40b51deb79aea910f28999d7c8c6b5a affected
bfc6444b57dc7186b6acc964705d7516cbaf3904< e6a2f5f845f50b0c4299bace5111f56d3390a090 affected
bfc6444b57dc7186b6acc964705d7516cbaf3904< 9dc325327babe7f159e84cbe9380a45342da0585 affected
58a5c93bd1a6e949267400080f07e57ffe05ec34 affected
e2ecdddca80dd845df42376e4b0197fe97018ba2 affected
de7cffa53149c7b48bd1bb29b02390c9f05b7f41 affected
6.1.101< 6.2 affected
6.6.42< 6.7 affected
… +6 more rows
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I. Basic Information for CVE-2026-74733

Vulnerability Information
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Vulnerability Title
gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock Locking is disabled in the regmap config as this driver uses its own lock. This means that all calls to regmap functions (read or write) must hold the i2c_lock. The function pca953x_irq_bus_sync_unlock() did not do this, and it was therefore possible that multiple threads could cause an incorrect register to be read/written. A previous patch partly fixed this, but only protected the write to the interrupt mask register, and not the read from the direction register.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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基金会开源的一个操作系统内核。 Linux kernel 6.1.101至6.2之前版本、6.6.42至6.7之前版本、6.9.11至6.10之前版本和6.10版本存在安全漏洞，该漏洞源于pca953x_irq_bus_sync_unlock函数未持有i2c_lock，可能导致多个线程错误读写寄存器。
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 bfc6444b57dc7186b6acc964705d7516cbaf3904 ~ bf3f37c2d40b51deb79aea910f28999d7c8c6b5a -
Linux Linux 6.10 -

II. Public POCs for CVE-2026-74733

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III. Intelligence Information for CVE-2026-74733

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Patches & Fixes for CVE-2026-74733 (2)

Other References for CVE-2026-74733 (1)

Same Patch Batch · Linux · 2026-08-22 · 149 CVEs total

CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74712 9.3 CRITICAL vdpa/mlx5: Fix buffer length in create_direct_keys()
CVE-2026-74665 9.1 CRITICAL net: fix skb length accounting after generic XDP frag adjustment

Showing top 20 of 149 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74733

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