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Fencer Vulns
high 7.8

CVE-2024-38580 json

epoll: be better about file lifetimes

published 2024-06-19 2 y ago modified 2026-08-05 3 mo ago also EUVD-2024-37443

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

epoll: be better about file lifetimes

epoll can call out to vfs_poll() with a file pointer that may race with the last 'fput()'. That would make f_count go down to zero, and while the ep->mtx locking means that the resulting file pointer tear-down will be blocked until the poll returns, it means that f_count is already dead, and any use of it won't actually get a reference to the file any more: it's dead regardless.

Make sure we have a valid ref on the file pointer before we call down to vfs_poll() from the epoll routines.

Patch / fix

  • Linux Linux 5.15.161, 6.1.93, 6.6.33, 6.8.12, 6.9
  • linux Debian 12 6.1.94-1
  • linux Debian 14, Debian 13 6.8.12-1

debian advisories DEBIAN-CVE-2024-38580

  • linux Ubuntu 22.04 LTS 5.15.0-121.131
  • linux Ubuntu 24.04 LTS 6.8.0-40.40
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1069.75
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1013.14
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1068.76
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1012.13
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1066.72
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1008.11

ubuntu advisories UBUNTU-CVE-2024-38580

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 9 5.14.0-427.28.1.el9_4
  • rv RHEL 9 5.14.0-427.28.1.el9_4
  • perf RHEL 9 5.14.0-427.28.1.el9_4
  • rtla RHEL 9 5.14.0-427.28.1.el9_4
  • bpftool RHEL 9 7.3.0-427.28.1.el9_4
  • libperf RHEL 9 5.14.0-427.28.1.el9_4
  • kernel-rt RHEL 9 5.14.0-427.28.1.el9_4
  • kernel-64k RHEL 9 5.14.0-427.28.1.el9_4

red hat advisories RHSA-2024:4928

  • kernel-rt Linux Micro 6.0 6.4.0-9.1
  • kernel-source-rt Linux Micro 6.0 6.4.0-9.1
  • kernel-source Linux Micro 6.0 6.4.0-18.1
  • kernel-default Linux Micro 6.0 6.4.0-18.1
  • kernel-kvmsmall Linux Micro 6.0 6.4.0-18.1
  • kernel-default-base Linux Micro 6.0 6.4.0-17.1.1.51
  • kernel-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.5.1
  • kernel-syms-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.5.1

suse advisories SUSE-SU-2025:20028-1SUSE-SU-2025:20008-1SUSE-SU-2024:2973-1SUSE-SU-2024:2939-1SUSE-SU-2024:2896-1SUSE-SU-2024:2571-1

  • kernel AlmaLinux 9 5.14.0-427.28.1.el9_4
  • rv AlmaLinux 9 5.14.0-427.28.1.el9_4
  • perf AlmaLinux 9 5.14.0-427.28.1.el9_4
  • rtla AlmaLinux 9 5.14.0-427.28.1.el9_4
  • bpftool AlmaLinux 9 7.3.0-427.28.1.el9_4
  • libperf AlmaLinux 9 5.14.0-427.28.1.el9_4
  • kernel-rt AlmaLinux 9 5.14.0-427.28.1.el9_4
  • kernel-64k AlmaLinux 9 5.14.0-427.28.1.el9_4

almalinux advisories ALSA-2024:4928

  • kernel Rocky Linux 9 5.14.0-427.28.1.el9_4.cloud.1.0
  • kernel Rocky Linux 9 5.14.0-427.28.1.el9_4

rocky linux advisories RXSA-2024:4928RLSA-2024:4928

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-38580 updated cvss 3.3

kernel: epoll: be better about file lifetimes

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.28.1.el9_4, perf 5.14.0-427.28.1.el9_4, rtla 5.14.0-427.28.1.el9_4, kernel-devel-matched 5.14.0-427.28.1.el9_4, kernel-64k-devel-matched 5.14.0-427.28.1.el9_4, kernel-debug-devel-matched 5.14.0-427.28.1.el9_4, +6 more Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.28.1.el9_4, kernel 5.14.0-427.28.1.el9_4, kernel-64k 5.14.0-427.28.1.el9_4, kernel-core 5.14.0-427.28.1.el9_4, kernel-tools 5.14.0-427.28.1.el9_4, python3-perf 5.14.0-427.28.1.el9_4, +28 more Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.28.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.28.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.28.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.28.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.28.1.el9_4 Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.28.1.el9_4, kernel-rt-kvm 5.14.0-427.28.1.el9_4, kernel-rt-core 5.14.0-427.28.1.el9_4, kernel-rt-modules 5.14.0-427.28.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.28.1.el9_4, kernel-rt-debug-core 5.14.0-427.28.1.el9_4, +6 more Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.28.1.el9_4, kernel-rt-core 5.14.0-427.28.1.el9_4, kernel-rt-modules 5.14.0-427.28.1.el9_4, kernel-rt-debug-core 5.14.0-427.28.1.el9_4, kernel-rt-modules-core 5.14.0-427.28.1.el9_4, kernel-rt-debug-modules 5.14.0-427.28.1.el9_4, +4 more
    fixed: vendor fix RHSA-2024:4928

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.