CVE-2026-72083 - scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE

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CRITICAL

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

Published Aug 15, 2026

9.8

CRITICAL

CVSS 3.1

EPSS 0.72%

Description

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.

Affected products

Vendor Linux Product Linux Default
unaffected
- Version
  3.2.9
  Status
  affected
  Constraints
  <3.3
Vendor Linux Product Linux Default
unaffected
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
  -
Vendor Linux Product Linux Default
affected
- Version
  3.3
  Status
  affected
  Constraints
  -
- Version
  0
  Status
  unaffected
  Constraints
  <3.3
- Version
  5.10.261
  Status
  unaffected
  Constraints
  <=5.10.*
- Version
  5.15.212
  Status
  unaffected
  Constraints
  <=5.15.*
- Version
  6.1.178
  Status
  unaffected
  Constraints
  <=6.1.*
- Version
  6.12.97
  Status
  unaffected
  Constraints
  <=6.12.*
- Version
  6.18.40
  Status
  unaffected
  Constraints
  <=6.18.*
- Version
  6.6.145
  Status
  unaffected
  Constraints
  <=6.6.*
- Version
  7.1.5
  Status
  unaffected
  Constraints
  <=7.1.*
- Version
  7.2
  Status
  unaffected
  Constraints
  <=*

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Linux

unaffected

Version	Status	Constraints
3.2.9	affected	<3.3

Linux

unaffected

Version	Status	Constraints
	affected
	affected
	affected
	affected
	affected
	affected
	affected
	affected
	affected	-

Linux

affected

Version	Status	Constraints
3.3	affected	-
0	unaffected	<3.3
5.10.261	unaffected	<=5.10.*
5.15.212	unaffected	<=5.15.*
6.1.178	unaffected	<=6.1.*
6.12.97	unaffected	<=6.12.*
6.18.40	unaffected	<=6.18.*
6.6.145	unaffected	<=6.6.*
7.1.5	unaffected	<=7.1.*
7.2	unaffected	<=*

Red Hat Enterprise Linux 10

kernel

Affected
Red Hat Enterprise Linux 6

kernel

Under investigation
Red Hat Enterprise Linux 7

kernel

Affected
Red Hat Enterprise Linux 7

kernel-rt

Affected
Red Hat Enterprise Linux 8

kernel

Affected
Red Hat Enterprise Linux 8

kernel-rt

Affected
Red Hat Enterprise Linux 9

kernel

Affected
Red Hat Enterprise Linux 9

kernel-rt

Affected

Product	Package	State	Advisory
Red Hat Enterprise Linux 10	kernel	Affected	n/a
Red Hat Enterprise Linux 6	kernel	Under investigation	n/a
Red Hat Enterprise Linux 7	kernel	Affected	n/a
Red Hat Enterprise Linux 7	kernel-rt	Affected	n/a
Red Hat Enterprise Linux 8	kernel	Affected	n/a
Red Hat Enterprise Linux 8	kernel-rt	Affected	n/a
Red Hat Enterprise Linux 9	kernel	Affected	n/a
Red Hat Enterprise Linux 9	kernel-rt	Affected	n/a

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-825

References (13)

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2026-72083		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2516579		Issue Tracking
https://git.kernel.org/stable/c/05b3e37433cf2eaf8867f1c16528aa347bb212ab
https://git.kernel.org/stable/c/59a2a5a37dc49a641ad6bc64aee34e5a61025ffd
https://git.kernel.org/stable/c/7d56f5c868d92c9d504a34a3ea450bce481c7f63
https://git.kernel.org/stable/c/9f8076cc73dfa6b10155978c160587e986b22169
https://git.kernel.org/stable/c/a040004846f1fbe687f6ec76d9ccc27b4ead42e4
https://git.kernel.org/stable/c/cb7bdae7fba404852ade34b0c1445fbaf3e54fbb
https://git.kernel.org/stable/c/ef2ee18fec92088c7d8877baf7674e89389ccd66
https://git.kernel.org/stable/c/fda6a1f3c3d7047b5ce5654487649c2daa738bfc
https://lore.kernel.org/linux-cve-announce/2026081521-CVE-2026-72083-e7ac@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-72083
https://www.cve.org/CVERecord?id=CVE-2026-72083