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CVE-2026-74654— serial: 8250_dma: Clear stale RX state on shutdown

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，已修复以下漏洞： serial: 8250_dma: 在关闭时清除残留的接收（RX）状态 会终止接收端 DMA（RX DMA）并释放通道，但未将 标志清零。如果在执行接收传输期间关闭串口端口，残留的状态会一直保留，直到下次打开端口时再次请求该通道，期间 为空（NULL）。 由提交 （“serial: 8250_dw: 确保 BUSY 信号被解除断言”）引入的 DesignWare BUSY 临时解决方案，在启动阶段通过 LCR（线路控制寄存器）写入路径调用 。此时， 尚未获取新的接收通道。因

AI Predicted 5.6 Difficulty: Trivial EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe< bf4fb620e02962b2b52500a4b3d8420f351eb46a affected
0fcb7901f9d61a325b4c5b88c600383bcbeb97fe< e10f06ee050a08930e2339b6fec7148fd0b2a8f6 affected
0fcb7901f9d61a325b4c5b88c600383bcbeb97fe< d06cfb1add4a2d5b393e9e31f49ebbd168beea49 affected
0fcb7901f9d61a325b4c5b88c600383bcbeb97fe< e7a5d792cf64a2096e18f1d573cc3d01cba15e92 affected
0fcb7901f9d61a325b4c5b88c600383bcbeb97fe< 9f2444f4c0e4b06f61bae38da87c9c94c78efa86 affected
0fcb7901f9d61a325b4c5b88c600383bcbeb97fe< ae05d9e50b6b9f246c110b3bdc03676145c2d0d4 affected
0fcb7901f9d61a325b4c5b88c600383bcbeb97fe< e7e3cc6709caa49d1d6ce6c1f7cb305e38675cc9 affected
0fcb7901f9d61a325b4c5b88c600383bcbeb97fe< e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41 affected
… +10 more rows
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I. Basic Information for CVE-2026-74654

Vulnerability Information
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Vulnerability Title
serial: 8250_dma: Clear stale RX state on shutdown
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: serial: 8250_dma: Clear stale RX state on shutdown serial8250_release_dma() terminates RX DMA and releases the channel, but leaves rx_running set. If the port is closed while an RX transfer is active, the stale state remains while rxchan is NULL until the channel is requested again on the next open. The DesignWare BUSY workaround added by commit a7b9ce39fbe4 ("serial: 8250_dw: Ensure BUSY is deasserted") calls serial8250_rx_dma_flush() from the LCR write path during startup. This happens before serial8250_request_dma() obtains a new RX channel. On reopen, the stale rx_running state therefore makes the flush path pass a NULL channel to dmaengine_pause(), causing a kernel Oops. Clear rx_running after terminating RX DMA, matching the TX cleanup. Also make the flush helper return if the DMA object or RX channel is not available so startup and teardown paths cannot pass a NULL channel to the DMAengine API.
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 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe ~ bf4fb620e02962b2b52500a4b3d8420f351eb46a -
Linux Linux 3.19 -

II. Public POCs for CVE-2026-74654

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III. Intelligence Information for CVE-2026-74654

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Patches & Fixes for CVE-2026-74654 (8)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
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-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
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 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74654

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