CVE-2026-74654: linux

CVSS: UnknownReceived
AliasesUBUNTU-CVE-2026-74654DEBIAN-CVE-2026-74654
Published 22-08-2026Last modified 22-08-2026
Open JSON

Vulnerability summary

CVE-2026-74654 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.8% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 6 · Related 5
MGASA-2026-0506USN-8875-1USN-8875-2USN-8877-1USN-8878-1USN-8879-1

Timeline

  1. 22-08-2026
    PublishedVulnerability first disclosed.

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.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

0.00 pp

From 0.18% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.9-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe, < bf4fb620e02962b2b52500a4b3d8420f351eb46a | ≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe, < e10f06ee050a08930e2339b6fec7148fd0b2a8f6 | ≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe, < d06cfb1add4a2d5b393e9e31f49ebbd168beea49 | ≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe, < e7a5d792cf64a2096e18f1d573cc3d01cba15e92 | ≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe, < 9f2444f4c0e4b06f61bae38da87c9c94c78efa86 | ≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe, < ae05d9e50b6b9f246c110b3bdc03676145c2d0d4 | ≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe, < e7e3cc6709caa49d1d6ce6c1f7cb305e38675cc9 | ≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe, < e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41 | 3.19

3 vendors · 172 products

References

18 links
Show all 18 references