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Fencer Vulns
high 7.8

CVE-2024-47745 json

mm: call the security_mmap_file() LSM hook in remap_file_pages()

published 2024-10-21 2 y ago modified 2026-08-05 3 mo ago also EUVD-2024-42828

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

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

mm: call the security_mmap_file() LSM hook in remap_file_pages()

The remap_file_pages syscall handler calls do_mmap() directly, which doesn't contain the LSM security check. And if the process has called personality(READ_IMPLIES_EXEC) before and remap_file_pages() is called for RW pages, this will actually result in remapping the pages to RWX, bypassing a W^X policy enforced by SELinux.

So we should check prot by security_mmap_file LSM hook in the remap_file_pages syscall handler before do_mmap() is called. Otherwise, it potentially permits an attacker to bypass a W^X policy enforced by SELinux.

The bypass is similar to CVE-2016-10044, which bypass the same thing via AIO and can be found in [1].

The PoC:

$ cat > test.c

int main(void) { size_t pagesz = sysconf(_SC_PAGE_SIZE); int mfd = syscall(SYS_memfd_create, "test", 0); const char *buf = mmap(NULL, 4 * pagesz, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0); unsigned int old = syscall(SYS_personality, 0xffffffff); syscall(SYS_personality, READ_IMPLIES_EXEC | old); syscall(SYS_remap_file_pages, buf, pagesz, 0, 2, 0); syscall(SYS_personality, old); // show the RWX page exists even if W^X policy is enforced int fd = open("/proc/self/maps", O_RDONLY); unsigned char buf2[1024]; while (1) { int ret = read(fd, buf2, 1024); if (ret <= 0) break; write(1, buf2, ret); } close(fd); }

$ gcc test.c -o test $ ./test | grep rwx 7f1836c34000-7f1836c35000 rwxs 00002000 00:01 2050 /memfd:test (deleted)

[PM: subject line tweaks]

Patch / fix

  • Linux Linux 3.17, 6.1.120, 6.6.54, 6.10.13, 6.11.2, 6.12
  • linux Debian 12 6.1.123-1
  • linux Debian 14, Debian 13 6.11.2-1

debian advisories DEBIAN-CVE-2024-47745

  • linux Ubuntu 24.04 LTS 6.8.0-54.56
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1023.25
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1024.26
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1019.23
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1022.22
  • linux-azure Ubuntu 24.04 LTS 6.8.0-1025.30
  • linux-gkeop Ubuntu 24.04 LTS 6.8.0-1006.8
  • linux-raspi Ubuntu 24.04 LTS 6.8.0-1019.23

ubuntu advisories UBUNTU-CVE-2024-47745

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 5.14.0-570.12.1.el9_6
  • rv RHEL 9 5.14.0-570.12.1.el9_6
  • perf RHEL 9 5.14.0-570.12.1.el9_6
  • rtla RHEL 9 5.14.0-570.12.1.el9_6
  • libperf RHEL 9 5.14.0-570.12.1.el9_6
  • kernel-rt RHEL 9 5.14.0-570.12.1.el9_6
  • kernel-64k RHEL 9 5.14.0-570.12.1.el9_6
  • kernel-core RHEL 9 5.14.0-570.12.1.el9_6

red hat advisories RHSA-2025:7683RHSA-2025:7676RHSA-2025:6966RHSA-2025:4509

  • kernel-source Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1
  • kernel-default Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1
  • kernel-kvmsmall Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1
  • kernel-default-base Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1.21.4
  • kernel-livepatch-MICRO-6-0_Update_4 Linux Micro 6.1, Linux Micro 6.0 1-1.2
  • kernel-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-22.1
  • kernel-source-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-22.1
  • kernel-livepatch-MICRO-6-0-RT_Update_4 Linux Micro 6.1, Linux Micro 6.0 1-1.1

suse advisories SUSE-SU-2025:20164-1SUSE-SU-2025:20247-1SUSE-SU-2025:20163-1SUSE-SU-2025:20246-1SUSE-SU-2025:0034-1SUSE-SU-2024:4387-1

  • kernel-source-longterm openSUSE Tumbleweed 6.12.11-1.1
  • kernel-source openSUSE Tumbleweed 6.11.8-1.1

opensuse advisories openSUSE-SU-2025:14705-1openSUSE-SU-2024:14500-1

  • kernel Azure Linux 3.0 6.6.56.1-5

azure linux advisories AZL-50975

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2024-47745 updated cvss 4.7

kernel: mm: call the security_mmap_file() LSM hook in remap_file_pages()

  • 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 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: workaround, no fix planned “The issue exists if SELinux W^X policy restrictions are being used.”
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.117.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.117.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.117.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.117.1.el9_2
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:7683
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.67.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.67.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.67.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.67.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.67.1.el9_4
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:4509
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-570.12.1.el9_6, perf 5.14.0-570.12.1.el9_6, rtla 5.14.0-570.12.1.el9_6, python3-perf 5.14.0-570.12.1.el9_6, kernel-devel-matched 5.14.0-570.12.1.el9_6, kernel-64k-devel-matched 5.14.0-570.12.1.el9_6, +7 more
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:6966
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.117.1.el9_2, rtla 5.14.0-284.117.1.el9_2, kernel-devel-matched 5.14.0-284.117.1.el9_2, kernel-64k-devel-matched 5.14.0-284.117.1.el9_2, kernel-debug-devel-matched 5.14.0-284.117.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.117.1.el9_2, +5 more
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:7683
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.67.1.el9_4, perf 5.14.0-427.67.1.el9_4, rtla 5.14.0-427.67.1.el9_4, kernel-devel-matched 5.14.0-427.67.1.el9_4, kernel-64k-devel-matched 5.14.0-427.67.1.el9_4, kernel-debug-devel-matched 5.14.0-427.67.1.el9_4, +6 more
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:4509
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.12.1.el9_6, kernel-64k 5.14.0-570.12.1.el9_6, kernel-core 5.14.0-570.12.1.el9_6, kernel-tools 5.14.0-570.12.1.el9_6, kernel-modules 5.14.0-570.12.1.el9_6, kernel-64k-core 5.14.0-570.12.1.el9_6, +27 more
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:6966
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.117.1.el9_2, kernel 5.14.0-284.117.1.el9_2, kernel-64k 5.14.0-284.117.1.el9_2, kernel-core 5.14.0-284.117.1.el9_2, kernel-tools 5.14.0-284.117.1.el9_2, python3-perf 5.14.0-284.117.1.el9_2, +28 more
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:7683
show 7 more
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.67.1.el9_4, kernel 5.14.0-427.67.1.el9_4, kernel-64k 5.14.0-427.67.1.el9_4, kernel-core 5.14.0-427.67.1.el9_4, kernel-tools 5.14.0-427.67.1.el9_4, python3-perf 5.14.0-427.67.1.el9_4, +28 more
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:4509
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.12.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.12.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.12.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.12.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.12.1.el9_6 Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.12.1.el9_6, kernel-rt-64k 5.14.0-570.12.1.el9_6, kernel-rt-core 5.14.0-570.12.1.el9_6, kernel-rt-modules 5.14.0-570.12.1.el9_6, kernel-rt-64k-core 5.14.0-570.12.1.el9_6, kernel-rt-debug-core 5.14.0-570.12.1.el9_6, +14 more
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:6966
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-core 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-modules 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-debug-core 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-modules-core 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-debug-modules 5.14.0-284.117.1.rt14.402.el9_2, +4 more
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:7676
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.67.1.el9_4, kernel-rt-core 5.14.0-427.67.1.el9_4, kernel-rt-modules 5.14.0-427.67.1.el9_4, kernel-rt-debug-core 5.14.0-427.67.1.el9_4, kernel-rt-modules-core 5.14.0-427.67.1.el9_4, kernel-rt-debug-modules 5.14.0-427.67.1.el9_4, +4 more
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:4509
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-570.12.1.el9_6, kernel-rt-kvm 5.14.0-570.12.1.el9_6, kernel-rt-core 5.14.0-570.12.1.el9_6, kernel-rt-modules 5.14.0-570.12.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.12.1.el9_6, kernel-rt-debug-core 5.14.0-570.12.1.el9_6, +6 more
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:6966
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-kvm 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-core 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-modules 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-debug-kvm 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-debug-core 5.14.0-284.117.1.rt14.402.el9_2, +6 more
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:7676
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.67.1.el9_4, kernel-rt-kvm 5.14.0-427.67.1.el9_4, kernel-rt-core 5.14.0-427.67.1.el9_4, kernel-rt-modules 5.14.0-427.67.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.67.1.el9_4, kernel-rt-debug-core 5.14.0-427.67.1.el9_4, +6 more
    fixed: vendor fix “The issue exists if SELinux W^X policy restrictions are being used.” RHSA-2025:4509

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

0.28% chance of exploitation in the next 30 days, higher than 21% 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 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-670 Always-Incorrect Control Flow Implementation
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.