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Fencer Vulns
medium 5.5

CVE-2023-53513 json

nbd: fix incomplete validation of ioctl arg

published 2025-10-01 13 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-32743

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

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

nbd: fix incomplete validation of ioctl arg

We tested and found an alarm caused by nbd_ioctl arg without verification. The UBSAN warning calltrace like below:

UBSAN: Undefined behaviour in fs/buffer.c:1709:35 signed integer overflow: -9223372036854775808 - 1 cannot be represented in type 'long long int' CPU: 3 PID: 2523 Comm: syz-executor.0 Not tainted 4.19.90 #1 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x0/0x3f0 arch/arm64/kernel/time.c:78 show_stack+0x28/0x38 arch/arm64/kernel/traps.c:158 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x170/0x1dc lib/dump_stack.c:118 ubsan_epilogue+0x18/0xb4 lib/ubsan.c:161 handle_overflow+0x188/0x1dc lib/ubsan.c:192 __ubsan_handle_sub_overflow+0x34/0x44 lib/ubsan.c:206 __block_write_full_page+0x94c/0xa20 fs/buffer.c:1709 block_write_full_page+0x1f0/0x280 fs/buffer.c:2934 blkdev_writepage+0x34/0x40 fs/block_dev.c:607 __writepage+0x68/0xe8 mm/page-writeback.c:2305 write_cache_pages+0x44c/0xc70 mm/page-writeback.c:2240 generic_writepages+0xdc/0x148 mm/page-writeback.c:2329 blkdev_writepages+0x2c/0x38 fs/block_dev.c:2114 do_writepages+0xd4/0x250 mm/page-writeback.c:2344

The reason for triggering this warning is __block_write_full_page() -> i_size_read(inode) - 1 overflow. inode->i_size is assigned in __nbd_ioctl() -> nbd_set_size() -> bytesize. We think it is necessary to limit the size of arg to prevent errors.

Moreover, __nbd_ioctl() -> nbd_add_socket(), arg will be cast to int. Assuming the value of arg is 0x80000000000000001) (on a 64-bit machine), it will become 1 after the coercion, which will return unexpected results.

Fix it by adding checks to prevent passing in too large numbers.

Patch / fix

  • Linux Linux 5.15.113, 6.1.30, 6.3.4, 6.4
  • linux Debian 12 6.1.37-1
  • linux Debian 14, Debian 13 6.3.7-1

debian advisories DEBIAN-CVE-2023-53513

  • linux Ubuntu 22.04 LTS 5.15.0-83.92
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1044.49
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1041.49
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1041.46
  • linux-ibm Ubuntu 22.04 LTS 5.15.0-1037.40
  • linux-kvm Ubuntu 22.04 LTS 5.15.0-1041.46
  • linux-azure Ubuntu 22.04 LTS 5.15.0-1046.53
  • linux-gkeop Ubuntu 22.04 LTS 5.15.0-1027.32

ubuntu advisories UBUNTU-CVE-2023-53513

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-rt RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.87.1.rt7.428.el8_10

red hat advisories RHSA-2026:3388RHSA-2026:0536RHSA-2026:0533RHSA-2026:0532RHSA-2025:23426RHSA-2025:23424

  • kernel-rt SLE Micro 5.4, SLE Micro 5.3 5.14.21-150400.15.133.1
  • kernel-source-rt SLE Micro 5.4, SLE Micro 5.3 5.14.21-150400.15.133.1
  • kernel-64kb SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS, SLE High Performance Computing 15 SP4-ESPOS 5.14.21-150400.24.179.1
  • kernel-syms SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +3 more 5.14.21-150400.24.179.1
  • kernel-source SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +3 more 5.14.21-150400.24.179.1
  • kernel-default SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +7 more 5.14.21-150400.24.179.1
  • kernel-zfcpdump SLES 15 SP4-LTSS, Manager Server LTS 4.3 5.14.21-150400.24.179.1
  • kernel-obs-build SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 5.14.21-150400.24.179.1

suse advisories SUSE-SU-2025:3716-1SUSE-SU-2025:03628-1

  • kernel-rt AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-core AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-modules AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-debug-core AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-debug-modules AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-modules-extra AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-debug-modules-extra AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel AlmaLinux 8 4.18.0-553.87.1.el8_10

almalinux advisories ALSA-2025:22387ALSA-2025:22388

  • kernel-rt Rocky Linux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel Rocky Linux 8 4.18.0-553.87.1.el8_10

rocky linux advisories RLSA-2025:22387RLSA-2025:22388

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-2023-53513 updated cvss 7.3

kernel: nbd: fix incomplete validation of ioctl arg

  • 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 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 available
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.13.1.el9_4, perf 5.14.0-427.13.1.el9_4, rtla 5.14.0-427.13.1.el9_4, kernel-devel-matched 5.14.0-427.13.1.el9_4, kernel-64k-devel-matched 5.14.0-427.13.1.el9_4, kernel-debug-devel-matched 5.14.0-427.13.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:2394
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.158.1.el9_0, kernel-devel-matched 5.14.0-70.158.1.el9_0, kernel-debug-devel-matched 5.14.0-70.158.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.158.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.158.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.158.1.el9_0, +2 more
    fixed: vendor fix RHSA-2025:23426
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.148.1.el9_2, rtla 5.14.0-284.148.1.el9_2, kernel-devel-matched 5.14.0-284.148.1.el9_2, kernel-64k-devel-matched 5.14.0-284.148.1.el9_2, kernel-debug-devel-matched 5.14.0-284.148.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.148.1.el9_2, +5 more
    fixed: vendor fix RHSA-2025:22095
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.87.1.el8_10, kernel 4.18.0-553.87.1.el8_10, bpftool 4.18.0-553.87.1.el8_10, kernel-core 4.18.0-553.87.1.el8_10, kernel-tools 4.18.0-553.87.1.el8_10, python3-perf 4.18.0-553.87.1.el8_10, +15 more
    fixed: vendor fix RHSA-2025:22388
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.13.1.el9_4, kernel 5.14.0-427.13.1.el9_4, kernel-64k 5.14.0-427.13.1.el9_4, kernel-core 5.14.0-427.13.1.el9_4, kernel-tools 5.14.0-427.13.1.el9_4, python3-perf 5.14.0-427.13.1.el9_4, +28 more
    fixed: vendor fix RHSA-2024:2394
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.187.1.el8_2, kernel 4.18.0-193.187.1.el8_2, bpftool 4.18.0-193.187.1.el8_2, kernel-core 4.18.0-193.187.1.el8_2, kernel-tools 4.18.0-193.187.1.el8_2, python3-perf 4.18.0-193.187.1.el8_2, +8 more
    fixed: vendor fix RHSA-2026:3388
show 17 more
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.183.1.el8_4, kernel 4.18.0-305.183.1.el8_4, bpftool 4.18.0-305.183.1.el8_4, kernel-core 4.18.0-305.183.1.el8_4, kernel-tools 4.18.0-305.183.1.el8_4, python3-perf 4.18.0-305.183.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:0533
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.175.1.el8_6, kernel 4.18.0-372.175.1.el8_6, bpftool 4.18.0-372.175.1.el8_6, kernel-core 4.18.0-372.175.1.el8_6, kernel-tools 4.18.0-372.175.1.el8_6, python3-perf 4.18.0-372.175.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.175.1.el8_6, kernel 4.18.0-372.175.1.el8_6, bpftool 4.18.0-372.175.1.el8_6, kernel-core 4.18.0-372.175.1.el8_6, kernel-tools 4.18.0-372.175.1.el8_6, python3-perf 4.18.0-372.175.1.el8_6, +15 more
    fixed: vendor fix RHSA-2026:0536
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.124.1.el8_8, kernel 4.18.0-477.124.1.el8_8, bpftool 4.18.0-477.124.1.el8_8, kernel-core 4.18.0-477.124.1.el8_8, kernel-tools 4.18.0-477.124.1.el8_8, python3-perf 4.18.0-477.124.1.el8_8, +9 more
    fixed: vendor fix RHSA-2026:0532
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.158.1.el9_0, bpftool 5.14.0-70.158.1.el9_0, kernel-core 5.14.0-70.158.1.el9_0, kernel-tools 5.14.0-70.158.1.el9_0, python3-perf 5.14.0-70.158.1.el9_0, kernel-modules 5.14.0-70.158.1.el9_0, +14 more
    fixed: vendor fix RHSA-2025:23426
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.148.1.el9_2, kernel 5.14.0-284.148.1.el9_2, kernel-64k 5.14.0-284.148.1.el9_2, kernel-core 5.14.0-284.148.1.el9_2, kernel-tools 5.14.0-284.148.1.el9_2, python3-perf 5.14.0-284.148.1.el9_2, +28 more
    fixed: vendor fix RHSA-2025:22095
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.183.1.el8_4, kernel 4.18.0-305.183.1.el8_4, bpftool 4.18.0-305.183.1.el8_4, kernel-core 4.18.0-305.183.1.el8_4, kernel-tools 4.18.0-305.183.1.el8_4, python3-perf 4.18.0-305.183.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:0533
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.175.1.el8_6, kernel 4.18.0-372.175.1.el8_6, bpftool 4.18.0-372.175.1.el8_6, kernel-core 4.18.0-372.175.1.el8_6, kernel-tools 4.18.0-372.175.1.el8_6, python3-perf 4.18.0-372.175.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:0536
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.124.1.el8_8, kernel 4.18.0-477.124.1.el8_8, bpftool 4.18.0-477.124.1.el8_8, kernel-core 4.18.0-477.124.1.el8_8, kernel-tools 4.18.0-477.124.1.el8_8, python3-perf 4.18.0-477.124.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:0532
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.87.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.87.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.87.1.el8_10
    fixed: vendor fix RHSA-2025:22388
  • Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.13.1.el9_4
    fixed: vendor fix RHSA-2024:2394
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-kvm 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-core 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-modules 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-debug-kvm 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-debug-core 4.18.0-553.87.1.rt7.428.el8_10, +4 more
    fixed: vendor fix RHSA-2025:22387
  • Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.13.1.el9_4, kernel-rt-kvm 5.14.0-427.13.1.el9_4, kernel-rt-core 5.14.0-427.13.1.el9_4, kernel-rt-modules 5.14.0-427.13.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.13.1.el9_4, kernel-rt-debug-core 5.14.0-427.13.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:2394
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.158.1.rt21.230.el9_0, kernel-rt-kvm 5.14.0-70.158.1.rt21.230.el9_0, kernel-rt-core 5.14.0-70.158.1.rt21.230.el9_0, kernel-rt-modules 5.14.0-70.158.1.rt21.230.el9_0, kernel-rt-debug-kvm 5.14.0-70.158.1.rt21.230.el9_0, kernel-rt-debug-core 5.14.0-70.158.1.rt21.230.el9_0, +4 more Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.158.1.rt21.230.el9_0, kernel-rt-core 5.14.0-70.158.1.rt21.230.el9_0, kernel-rt-modules 5.14.0-70.158.1.rt21.230.el9_0, kernel-rt-debug-core 5.14.0-70.158.1.rt21.230.el9_0, kernel-rt-debug-modules 5.14.0-70.158.1.rt21.230.el9_0, kernel-rt-modules-extra 5.14.0-70.158.1.rt21.230.el9_0, +2 more
    fixed: vendor fix RHSA-2025:23424
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-core 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-modules 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-debug-core 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-modules-core 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-debug-modules 5.14.0-284.148.1.rt14.433.el9_2, +4 more Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-kvm 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-core 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-modules 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-debug-kvm 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-debug-core 5.14.0-284.148.1.rt14.433.el9_2, +6 more
    fixed: vendor fix RHSA-2025:22124
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-core 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-modules 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-debug-core 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-debug-modules 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-modules-extra 4.18.0-553.87.1.rt7.428.el8_10, +2 more
    fixed: vendor fix RHSA-2025:22387
  • Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.13.1.el9_4, kernel-rt-core 5.14.0-427.13.1.el9_4, kernel-rt-modules 5.14.0-427.13.1.el9_4, kernel-rt-debug-core 5.14.0-427.13.1.el9_4, kernel-rt-modules-core 5.14.0-427.13.1.el9_4, kernel-rt-debug-modules 5.14.0-427.13.1.el9_4, +4 more
    fixed: vendor fix RHSA-2024:2394
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 10 kernel
    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
4 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
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.