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CVE-2024-40966— tty: add the option to have a tty reject a new ldisc

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 tty 驱动在处理行纪律识别码（ldisc）时，未能提供拒绝新 ldisc 的选项。

AI Predicted 5.5 Difficulty: Hard EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux e1eaea46bb4020b38a141b84f88565d4603f8dd0< 3c6332f3bb1578b5b10ac2561247b1d6272ae937 affected
e1eaea46bb4020b38a141b84f88565d4603f8dd0< 287b569a5b914903ba7c438a3c0dbc3410ebb409 affected
e1eaea46bb4020b38a141b84f88565d4603f8dd0< 5920ac19964f9e20181f63b410d9200ddbf8dc86 affected
e1eaea46bb4020b38a141b84f88565d4603f8dd0< 6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59b affected
2.6.35 affected
< 2.6.35 unaffected
6.1.96≤ 6.1.* unaffected
6.6.36≤ 6.6.* unaffected
… +2 more rows
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I. Basic Information for CVE-2024-40966

Vulnerability Information
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Vulnerability Title
tty: add the option to have a tty reject a new ldisc
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tty: add the option to have a tty reject a new ldisc ... and use it to limit the virtual terminals to just N_TTY. They are kind of special, and in particular, the "con_write()" routine violates the "writes cannot sleep" rule that some ldiscs rely on. This avoids the BUG: sleeping function called from invalid context at kernel/printk/printk.c:2659 when N_GSM has been attached to a virtual console, and gsmld_write() calls con_write() while holding a spinlock, and con_write() then tries to get the console lock.
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 tty 驱动在处理行纪律识别码（ldisc）时，未能提供拒绝新 ldisc 的选项。
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 e1eaea46bb4020b38a141b84f88565d4603f8dd0 ~ 3c6332f3bb1578b5b10ac2561247b1d6272ae937 -
Linux Linux 2.6.35 -

II. Public POCs for CVE-2024-40966

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III. Intelligence Information for CVE-2024-40966

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Other References for CVE-2024-40966 (3)

Same Patch Batch · Linux · 2024-07-12 · 122 CVEs total

CVE-2024-40937 9.8 CRITICAL gve: Clear napi->skb before dev_kfree_skb_any()
CVE-2024-40907 9.8 CRITICAL ionic: fix kernel panic in XDP_TX action
CVE-2024-40999 9.8 CRITICAL net: ena: Add validation for completion descriptors consistency
CVE-2024-40923 9.8 CRITICAL vmxnet3: disable rx data ring on dma allocation failure
CVE-2024-40983 9.8 CRITICAL tipc: force a dst refcount before doing decryption
CVE-2024-40910 8.8 HIGH ax25: Fix refcount imbalance on inbound connections
CVE-2024-40911 8.8 HIGH wifi: cfg80211: Lock wiphy in cfg80211_get_station
CVE-2024-40941 8.1 HIGH wifi: iwlwifi: mvm: don't read past the mfuart notifcation
CVE-2024-40953 7.9 HIGH KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin()
CVE-2024-40947 7.8 HIGH ima: Avoid blocking in RCU read-side critical section
CVE-2024-39495 7.8 HIGH greybus: Fix use-after-free bug in gb_interface_release due to race condition.
CVE-2024-40909 7.8 HIGH bpf: Fix a potential use-after-free in bpf_link_free()
CVE-2024-40949 7.8 HIGH mm: shmem: fix getting incorrect lruvec when replacing a shmem folio
CVE-2024-40991 7.8 HIGH dmaengine: ti: k3-udma-glue: Fix of_k3_udma_glue_parse_chn_by_id()
CVE-2024-40990 7.8 HIGH RDMA/mlx5: Add check for srq max_sge attribute
CVE-2024-40989 7.8 HIGH KVM: arm64: Disassociate vcpus from redistributor region on teardown
CVE-2024-40925 7.8 HIGH block: fix request.queuelist usage in flush
CVE-2024-40984 7.8 HIGH ACPICA: Revert "ACPICA: avoid Info: mapping multiple BARs. Your kernel is fine."
CVE-2024-40924 7.8 HIGH drm/i915/dpt: Make DPT object unshrinkable
CVE-2024-40970 7.8 HIGH Avoid hw_desc array overrun in dw-axi-dmac

Showing top 20 of 122 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-40966

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