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CVE-2026-80886— serial: msm: Disable DMA for kernel console UART

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 4.4版本存在安全漏洞，该漏洞源于用户空间与内核空间并发写入控制台时触发竞争条件，可能导致相同消息无限循环打印。

AI Predicted 4.3 Difficulty: Hard EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1015

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6< f58e568dc308c8e13f7730c8de2da5ed514e540d affected
3a878c430fd6eb4f8587f9ebd187f773bf85d1d6< bb4296de5b538b575978c588cb3738ab8524d01a affected
3a878c430fd6eb4f8587f9ebd187f773bf85d1d6< 6acea62738ed4cae6746483026706a773b44dad7 affected
3a878c430fd6eb4f8587f9ebd187f773bf85d1d6< abc1926c88c189e5d698b91ed6890e09ab5c321d affected
3a878c430fd6eb4f8587f9ebd187f773bf85d1d6< 2727744ccb5ca59090451451ee94f530b1be04a5 affected
3a878c430fd6eb4f8587f9ebd187f773bf85d1d6< d354716245192de2d203f2b35f22ab8dc13595e2 affected
3a878c430fd6eb4f8587f9ebd187f773bf85d1d6< e3b42e326f4f30efcdc90bad5f5ba37e1cd91a47 affected
3a878c430fd6eb4f8587f9ebd187f773bf85d1d6< 22dd2777e6c180e1c945b00f6d18550979436324 affected
… +10 more rows
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I. Basic Information for CVE-2026-80886

Vulnerability Information
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Vulnerability Title
serial: msm: Disable DMA for kernel console UART
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: serial: msm: Disable DMA for kernel console UART At the moment, concurrent writes from userspace and the kernel to the console can trigger a race condition that results in an infinite loop of the same messages printed over and over again. This is most likely to happen during system startup or shutdown when the init system starts/stops a large number of system services that interact with various kernel code. When userspace writes to the TTY device, the driver initiates an asynchronous DMA transfer and releases the port lock. At the same moment, the kernel printk path might grab the port lock and re-configure the UART controller for PIO, without waiting for the DMA operation to complete. It seems like this collision results in zero progress being reported for the DMA engine, so the same text is printed to the console over and over again. For the kernel console, we want a reliable output path that will be functional even during crashes etc. So rather than implementing complex code to synchronize the kernel console write routines with the userspace DMA write routines, simply disable DMA for the console UART instance. Similar checks exist in many other serial drivers, e.g. 8250_port.c, imx.c, sh-sci.c etc.
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基金会开源的一个操作系统内核。 Linux kernel 4.4版本存在安全漏洞，该漏洞源于用户空间与内核空间并发写入控制台时触发竞争条件，可能导致相同消息无限循环打印。
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 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 ~ f58e568dc308c8e13f7730c8de2da5ed514e540d -
Linux Linux 4.4 -

II. Public POCs for CVE-2026-80886

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III. Intelligence Information for CVE-2026-80886

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Patches & Fixes for CVE-2026-80886 (8)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80854 usb: gadget: f_tcm: keep port count until LUN teardown completes
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80886

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