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Fencer Vulns
low 3.6

CVE-2020-29374 json

An issue was discovered in the Linux kernel before 5.7.3, related to mm/gup.c and mm/huge_memory.c.

published 2020-11-28 5 y ago modified 2026-10-08 31 d ago also EUVD-2020-21747

cvss
3.6
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

Summary

An issue was discovered in the Linux kernel before 5.7.3, related to mm/gup.c and mm/huge_memory.c. The get_user_pages (aka gup) implementation, when used for a copy-on-write page, does not properly consider the semantics of read operations and therefore can grant unintended write access, aka CID-17839856fd58.

Patch / fix

  • linux linux_kernel 5.7.3
  • linux Debian 14, Debian 13, Debian 12 5.7.6-1

debian advisories DEBIAN-CVE-2020-29374

  • linux Ubuntu 16.04 LTS 4.4.0-203.235
  • linux Ubuntu 18.04 LTS 4.15.0-136.140
  • linux Ubuntu 20.04 LTS 5.4.0-45.49
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1122.136
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1094.101
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1022.22
  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1093.106~16.04.1
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1022.22

ubuntu advisories UBUNTU-CVE-2020-29374

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-syms SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.66.2
  • kernel-source SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.66.2
  • kernel-default SLES for SAP 12 SP5, SLES 12 SP5, SLE Workstation Extension 12 SP5 +2 more 4.12.14-122.66.2
  • kernel-obs-build SLE Software Development Kit 12 SP5 4.12.14-122.66.2
  • kernel-rt SLE Real Time 12 SP5 4.12.14-10.37.1
  • kernel-syms-rt SLE Real Time 12 SP5 4.12.14-10.37.1
  • kernel-rt_debug SLE Real Time 12 SP5 4.12.14-10.37.1
  • kernel-source-rt SLE Real Time 12 SP5 4.12.14-10.37.1

suse advisories SUSE-SU-2021:1210-1SUSE-SU-2021:1176-1SUSE-SU-2021:1175-1SUSE-SU-2021:0741-1SUSE-SU-2021:0740-1SUSE-SU-2021:0738-1

  • kernel-syms openSUSE Leap 15.2 5.3.18-lp152.66.2
  • kernel-obs-qa openSUSE Leap 15.2 5.3.18-lp152.66.2
  • kernel-source openSUSE Leap 15.2 5.3.18-lp152.66.2
  • kernel-default openSUSE Leap 15.2 5.3.18-lp152.66.2
  • kernel-preempt openSUSE Leap 15.2 5.3.18-lp152.66.2
  • kernel-kvmsmall openSUSE Leap 15.2 5.3.18-lp152.66.2
  • kernel-obs-build openSUSE Leap 15.2 5.3.18-lp152.66.2
  • kernel-default-base openSUSE Leap 15.2 5.3.18-lp152.66.2.lp152.8.23.2

opensuse advisories openSUSE-SU-2021:0393-1

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-2020-29374 updated cvss 3.6

kernel: the get_user_pages implementation when used for a copy-on-write page does not properly consider the semantics of read operations and therefore can grant unintended read access

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +82 more
    not affected: vulnerable code not present

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
31 d ago

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.chromium.org https://bugs.chromium.org/p/project-zero/issues/detail?id=2045 referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 3.6 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
NVD 2.0 3.3 AV:L/AC:M/Au:N/C:P/I:P/A:N

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
  • CWE-863 Incorrect Authorization
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.