5.5

CVE-2024-26999: debian debian_linux Improper Locking

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2024-26999DEBIAN-CVE-2024-26999
Published 01-05-2024Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2024-26999 is a medium (CVSS 5.5) Improper Locking vulnerability in debian debian_linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.4% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
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 32 · Related 27
DLA-3842-1DSA-5680-1DSA-5681-1MGASA-2024-0263MGASA-2024-0266SUSE-SU-2024:2008-1

Timeline

  1. 01-05-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: serial/pmac_zilog: Remove flawed mitigation for rx irq flood The mitigation was intended to stop the irq completely. That may be better than a hard lock-up but it turns out that you get a crash anyway if you're using pmac_zilog as a serial console: ttyPZ0: pmz: rx irq flood ! BUG: spinlock recursion on CPU#0, swapper/0 That's because the pr_err() call in pmz_receive_chars() results in pmz_console_write() attempting to lock a spinlock already locked in pmz_interrupt(). With CONFIG_DEBUG_SPINLOCK=y, this produces a fatal BUG splat. The spinlock in question is the one in struct uart_port. Even when it's not fatal, the serial port rx function ceases to work. Also, the iteration limit doesn't play nicely with QEMU, as can be seen in the bug report linked below. A web search for other reports of the error message "pmz: rx irq flood" didn't produce anything. So I don't think this code is needed any more. Remove it.

CVSS metrics

3 scores · 3 sources · 1 version

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 18-09-2026

18-09-202618-10-2026
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

Affected systems

Ubuntu122 products
  • linuxAll versions (No fix recorded) | < 5.4.0-189.209 | < 5.15.0-116.126 | < 6.8.0-38.38
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1128.138 | < 5.15.0-1065.71 | < 6.8.0-1011.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
Linux2 products
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 69a02273e288011b521ee7c1f3ab2c23fda633ce | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < d679c816929d62af51c8e6d7fc0e165c9412d2f3 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < ab86cf6f8d24e63e9aca23da5108af1aa5483928 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7a3bbe41efa55323b6ea3c35fa15941d4dbecdef | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < bbaafbb4651fede8d3c3881601ecaa4f834f9d3f | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 52aaf1ff14622a04148dbb9ccce6d9de5d534ea7 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < ca09dfc3cfdf89e6af3ac24e1c6c0be5c575a729 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1be3226445362bfbf461c92a5bcdb1723f2e4907 | 2.6.12
  • linux_kernel≥ 2.6.12, < 5.15.157 | ≥ 5.16, < 6.1.88 | ≥ 6.2, < 6.6.29 | ≥ 6.7, < 6.8.8 | 6.9:rc1 | 6.9:rc2 | 6.9:rc3 | 6.9:rc4

3 vendors · 126 products

References

33 links
Show all 33 references