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Fencer Vulns
critical 9.8

CVE-2026-72083 in the critical feed json

scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE

published 2026-08-15 2 mo ago modified 2026-10-19 20 d ago also EUVD-2026-59041

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

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

scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE

core_scsi3_emulate_pro_register_and_move() maps the PERSISTENT RESERVE OUT parameter list with transport_kmap_data_sg() and parses the destination TransportID with target_parse_pr_out_transport_id(). For an iSCSI TransportID (FORMAT CODE 01b), iscsi_parse_pr_out_transport_id() returns the ISID in iport_ptr as a raw pointer into that mapped buffer.

The function then unmaps the buffer with transport_kunmap_data_sg() before dereferencing iport_ptr in strcmp(), __core_scsi3_locate_pr_reg() and core_scsi3_alloc_registration(). When the parameter list spans more than one page (PARAMETER LIST LENGTH > 4096), transport_kmap_data_sg() uses vmap() and transport_kunmap_data_sg() does vunmap(), so the kernel virtual address backing iport_ptr is torn down and every subsequent dereference is a use-after-free read of the unmapped region.

Keep the parameter list mapped until iport_ptr is no longer needed: drop the early transport_kunmap_data_sg() and unmap once on the success path, right before returning. The error paths already unmap through the existing "if (buf) transport_kunmap_data_sg(cmd)" at the out: label, which now runs on every post-map error exit because buf is no longer cleared early. Only reads of the mapping happen while spinlocks are held; the map and unmap calls remain outside any lock. The sibling caller core_scsi3_decode_spec_i_port() already uses the buffer before unmapping it and is left unchanged.

Patch / fix

  • Linux Linux 3.3, 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2
  • linux Debian 12 6.1.180-1
  • linux Debian 13 6.12.100-1
  • linux Debian 14 7.1.5-1

debian advisories DEBIAN-CVE-2026-72083

  • linux Ubuntu 22.04 LTS 5.15.0-198.208
  • linux Ubuntu 24.04 LTS 6.8.0-147.147
  • linux Ubuntu 26.04 LTS 7.0.0-34.34
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1117.124
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1067.70
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1013.13
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1118.128
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1071.79

ubuntu advisories UBUNTU-CVE-2026-72083

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-64kb SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS, SLE High Performance Computing 15 SP5-ESPOS 5.14.21-150500.55.192.2
  • kernel-syms SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.192.1
  • kernel-source SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.192.2
  • kernel-default SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +3 more 5.14.21-150500.55.192.2
  • kernel-obs-build SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.192.2
  • kernel-default-base SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.192.2.150500.6.89.2
  • kernel-rt SLE Micro 5.5 5.14.21-150500.13.164.1
  • kernel-source-rt SLE Micro 5.5 5.14.21-150500.13.164.1

suse advisories SUSE-SU-2026:4667-1SUSE-SU-2026:4665-1SUSE-SU-2026:4639-1SUSE-SU-2026:4254-1SUSE-SU-2026:4369-1SUSE-SU-2026:4284-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.38.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.38.1

opensuse advisories openSUSE-SU-2026:21910-1

  • kernel AlmaLinux 8 4.18.0-553.181.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.181.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.181.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.181.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.181.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.181.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.181.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.181.1.el8_10

almalinux advisories ALSA-2026:93436ALSA-2026:93437ALSA-2026:91565

  • kernel Rocky Linux 9 5.14.0-687.64.1.el9_8
  • kernel Rocky Linux 10 6.12.0-211.69.1.el10_2

rocky linux advisories RLSA-2026:93412RLSA-2026:91565

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-2026-72083 updated cvss 8.8

kernel: scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE

  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 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 available
  • Red Hat Enterprise Linux kernel-modules-internal 6.12.0-211.69.1.el10_2
    fixed: vendor fix RHSA-2026:91565
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.64.1.el9_8, perf 5.14.0-687.64.1.el9_8, rtla 5.14.0-687.64.1.el9_8, python3-perf 5.14.0-687.64.1.el9_8, kernel-devel-matched 5.14.0-687.64.1.el9_8, kernel-64k-devel-matched 5.14.0-687.64.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:93412
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.69.1.el10_2, perf 6.12.0-211.69.1.el10_2, rtla 6.12.0-211.69.1.el10_2, python3-perf 6.12.0-211.69.1.el10_2, kernel-devel-matched 6.12.0-211.69.1.el10_2, kernel-64k-devel-matched 6.12.0-211.69.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:91565
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.181.1.el8_10, kernel 4.18.0-553.181.1.el8_10, bpftool 4.18.0-553.181.1.el8_10, kernel-core 4.18.0-553.181.1.el8_10, kernel-tools 4.18.0-553.181.1.el8_10, python3-perf 4.18.0-553.181.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:93436
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.64.1.el9_8, kernel-64k 5.14.0-687.64.1.el9_8, kernel-core 5.14.0-687.64.1.el9_8, kernel-tools 5.14.0-687.64.1.el9_8, kernel-modules 5.14.0-687.64.1.el9_8, kernel-64k-core 5.14.0-687.64.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:93412
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.69.1.el10_2, kernel-64k 6.12.0-211.69.1.el10_2, kernel-core 6.12.0-211.69.1.el10_2, kernel-tools 6.12.0-211.69.1.el10_2, kernel-modules 6.12.0-211.69.1.el10_2, kernel-64k-core 6.12.0-211.69.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:91565
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.64.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.64.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.64.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.64.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.64.1.el9_8
    fixed: vendor fix RHSA-2026:93412
show 10 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.69.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.69.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.69.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.69.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.69.1.el10_2
    fixed: vendor fix RHSA-2026:91565
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.181.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.181.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.181.1.el8_10
    fixed: vendor fix RHSA-2026:93436
  • Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal 6.12.0-211.69.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.69.1.el10_2
    fixed: vendor fix RHSA-2026:91565
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.181.1.rt7.522.el8_10, kernel-rt-kvm 4.18.0-553.181.1.rt7.522.el8_10, kernel-rt-core 4.18.0-553.181.1.rt7.522.el8_10, kernel-rt-modules 4.18.0-553.181.1.rt7.522.el8_10, kernel-rt-debug-kvm 4.18.0-553.181.1.rt7.522.el8_10, kernel-rt-debug-core 4.18.0-553.181.1.rt7.522.el8_10, +4 more
    fixed: vendor fix RHSA-2026:93437
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.64.1.el9_8, kernel-rt-64k 5.14.0-687.64.1.el9_8, kernel-rt-core 5.14.0-687.64.1.el9_8, kernel-rt-modules 5.14.0-687.64.1.el9_8, kernel-rt-64k-core 5.14.0-687.64.1.el9_8, kernel-rt-debug-core 5.14.0-687.64.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:93412
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.69.1.el10_2, kernel-rt-64k 6.12.0-211.69.1.el10_2, kernel-rt-core 6.12.0-211.69.1.el10_2, kernel-rt-modules 6.12.0-211.69.1.el10_2, kernel-rt-64k-core 6.12.0-211.69.1.el10_2, kernel-rt-debug-core 6.12.0-211.69.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:91565
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.64.1.el9_8, kernel-rt-core 5.14.0-687.64.1.el9_8, kernel-rt-modules 5.14.0-687.64.1.el9_8, kernel-rt-debug-core 5.14.0-687.64.1.el9_8, kernel-rt-modules-core 5.14.0-687.64.1.el9_8, kernel-rt-debug-modules 5.14.0-687.64.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:93412
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.69.1.el10_2, kernel-rt-core 6.12.0-211.69.1.el10_2, kernel-rt-modules 6.12.0-211.69.1.el10_2, kernel-rt-debug-core 6.12.0-211.69.1.el10_2, kernel-rt-modules-core 6.12.0-211.69.1.el10_2, kernel-rt-debug-modules 6.12.0-211.69.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:91565
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.181.1.rt7.522.el8_10, kernel-rt-core 4.18.0-553.181.1.rt7.522.el8_10, kernel-rt-modules 4.18.0-553.181.1.rt7.522.el8_10, kernel-rt-debug-core 4.18.0-553.181.1.rt7.522.el8_10, kernel-rt-debug-modules 4.18.0-553.181.1.rt7.522.el8_10, kernel-rt-modules-extra 4.18.0-553.181.1.rt7.522.el8_10, +2 more
    fixed: vendor fix RHSA-2026:93437
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 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
yes
Technical impact
total
Assessed
23 d ago

Exploit prediction

0.72% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.