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CVE-2026-98753— tty: tty_port: restore TTY_IO_ERROR on activation failure

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.

在 Linux 内核中，以下漏洞已被修复： tty: tty_port：在激活失败时恢复 TTY_IO_ERROR 标志 确保在激活失败时恢复 TTY_IO_ERROR 标志，以防止对已消失或已断电的端口进行 I/O 操作。 此举特别用于避免以下问题：当 TTY 的 ioctl 操作与挂断（hangup）和打开（open）操作发生竞态时，访问已断电或已注销的端口可能导致因未加时钟控制的访问或空指针解引用而引发内核恐慌（kernel panic）。 需要注意的是，该标志会在 tty_port_close() 中再次设

AI Predicted 7.8 Difficulty: Hard

Possible ATT&CK Techniques 1 AI

T1212 · Exploitation for Credential Access

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4< 34d4f67472ef7a744970b772a8565ddc727788e2 affected
a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4< 7021acc84c2e0add77a1a33152e3a1e428fdbfdb affected
a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4< 6388409b711eb91b14fa075a4d861ccc4df1cfe7 affected
a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4< 56964f6a31238fb41d5830bb42520c5b10ff7d8f affected
2.6.33 affected
< 2.6.33 unaffected
6.12.113≤ 6.12.* unaffected
6.18.56≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-98753

Vulnerability Information
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Vulnerability Title
tty: tty_port: restore TTY_IO_ERROR on activation failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tty: tty_port: restore TTY_IO_ERROR on activation failure Make sure to restore the TTY_IO_ERROR flag if activation fails to prevent I/O attempts on a port that is gone or powered down. This specifically avoids issues like kernel panic due to unclocked accesses or NULL-pointer dereferences when accessing powered down or deregistered ports when a TTY ioctl races with hangup and open. Note that the flag is set again in tty_port_close() but not restoring it on activation failure leaves a window where drivers fail to handle the ioctl-hangup race.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 ~ 34d4f67472ef7a744970b772a8565ddc727788e2 -
Linux Linux 2.6.33 -

II. Public POCs for CVE-2026-98753

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III. Intelligence Information for CVE-2026-98753

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Patches & Fixes for CVE-2026-98753 (4)

Same Patch Batch · Linux · 2026-10-18 · 435 CVEs total

CVE-2026-98719 KVM: SEV: Nullify "have run CPUs" mask pointer when freeing it
CVE-2026-98732 Bluetooth: btintel: fix buffer over-read in btintel_hw_error()
CVE-2026-98731 Bluetooth: btintel_pcie: fix plen overflow in btintel_pcie_recv_frame()
CVE-2026-98730 Bluetooth: btintel_pcie: reject oversized TX packets in send_frame()
CVE-2026-98729 x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h
CVE-2026-98728 tpm: fix off-by-four bounds check in tpm2_get_random()
CVE-2026-98727 nvme-multipath: set BLK_FEAT_ZONED only after the zone info is known
CVE-2026-98726 nvme-multipath: fix underflow in ANA log bounds checks
CVE-2026-98725 nvmet-auth: fix out-of-bounds write in nvmet_auth_challenge()
CVE-2026-98724 nvmet: pci-epf: reject too-short SGL segments
CVE-2026-98723 nvmet: copy the hostid into the ctrl before creating PR pc_refs
CVE-2026-98722 mtd: block2mtd: Fix divide error when erase_size is zero
CVE-2026-98721 mtd: rawnand: cadence: Initialize IRQ state before requesting IRQ
CVE-2026-98720 KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified
CVE-2026-98707 wifi: mac80211: shut down RX BA session timer on teardown
CVE-2026-98711 wifi: cw1200: fix TX padding OOB read leaking heap data to device
CVE-2026-98710 wifi: iwlegacy: 3945: free EEPROM data on remove
CVE-2026-98709 wifi: mac80211: count only matching reservations in reserved switch
CVE-2026-98712 KVM: arm64: vgic: Take a refcount on IRQs referenced by last_lr_irq
CVE-2026-98708 wifi: mac80211: keep paired old chanctx alive

Showing top 20 of 435 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98753

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