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CVE-2026-43458— serial: caif: hold tty->link reference in ldisc_open and ser_release

AI Predicted 5.5 Difficulty: Moderate EPSS 0.03% · P9

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinuxe31d5a05948e4478ba8396063d1e1f39880928e2< 23a3ac2e2262a291498567418227b99e1f3606b1affected
e31d5a05948e4478ba8396063d1e1f39880928e2< 52135420e9f75853ea0c6cea7b736e3e98495f7daffected
e31d5a05948e4478ba8396063d1e1f39880928e2< ca2ceba983bb23ea0202c2882d963253416654a3affected
e31d5a05948e4478ba8396063d1e1f39880928e2< 8460187b4852fd00bd1c76394358053f3fa4d089affected
e31d5a05948e4478ba8396063d1e1f39880928e2< 27e43356d0defb9fc7fa25265219a3ffeb7b3e98affected
e31d5a05948e4478ba8396063d1e1f39880928e2< 35b58d3bc716ebb9ebd10fe1cac8c1177242511caffected
e31d5a05948e4478ba8396063d1e1f39880928e2< 97a0bb491cae39478c6225381f14e9ac67b7bba7affected
e31d5a05948e4478ba8396063d1e1f39880928e2< 288598d80a068a0e9281de35bcb4ce495f189e2aaffected
… +10 more rows
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I. Basic Information for CVE-2026-43458

Vulnerability Information
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Vulnerability Title
serial: caif: hold tty->link reference in ldisc_open and ser_release
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: serial: caif: hold tty->link reference in ldisc_open and ser_release A reproducer triggers a KASAN slab-use-after-free in pty_write_room() when caif_serial's TX path calls tty_write_room(). The faulting access is on tty->link->port. Hold an extra kref on tty->link for the lifetime of the caif_serial line discipline: get it in ldisc_open() and drop it in ser_release(), and also drop it on the ldisc_open() error path. With this change applied, the reproducer no longer triggers the UAF in my testing.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
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serial caif组件在ldisc_open和ser_release中未正确持有tty->link引用，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

VendorProductAffected VersionsCPESubscribe
LinuxLinux e31d5a05948e4478ba8396063d1e1f39880928e2 ~ 23a3ac2e2262a291498567418227b99e1f3606b1 -
LinuxLinux 2.6.35 -

II. Public POCs for CVE-2026-43458

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III. Intelligence Information for CVE-2026-43458

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Patch · 8

Same Patch Batch · Linux · 2026-05-08 · 199 CVEs total

CVE-2026-433769.8 CRITICALksmbd: fix use-after-free by using call_rcu() for oplock_info
CVE-2026-434149.8 CRITICALscsi: qla2xxx: Completely fix fcport double free
CVE-2026-433419.8 CRITICALnet/ipv6: ioam6: prevent schema length wraparound in trace fill
CVE-2026-433049.8 CRITICALlibceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-434029.8 CRITICALkthread: consolidate kthread exit paths to prevent use-after-free
CVE-2026-433799.8 CRITICALksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-434659.8 CRITICALnet/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
CVE-2026-433849.8 CRITICALnet/tcp-ao: Fix MAC comparison to be constant-time
CVE-2026-433839.4 CRITICALnet/tcp-md5: Fix MAC comparison to be constant-time
CVE-2026-434079.1 CRITICALlibceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
CVE-2026-434069.1 CRITICALlibceph: prevent potential out-of-bounds reads in process_message_header()
CVE-2026-432848.8 HIGHxfrm: esp: avoid in-place decrypt on shared skb frags
CVE-2026-433348.8 HIGHBluetooth: SMP: force responder MITM requirements before building the pairing response
CVE-2026-434038.8 HIGHnsfs: tighten permission checks for ns iteration ioctls
CVE-2026-433228.8 HIGHBluetooth: hci_sync: Fix UAF in le_read_features_complete
CVE-2026-433918.8 HIGHnsfs: tighten permission checks for handle opening
CVE-2026-432918.3 HIGHnet: nfc: nci: Fix parameter validation for packet data
CVE-2026-434668.2 HIGHnet/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery
CVE-2026-434528.2 HIGHnetfilter: x_tables: guard option walkers against 1-byte tail reads
CVE-2026-433658.2 HIGHxfs: fix undersized l_iclog_roundoff values

Showing top 20 of 199 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43458

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