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CVE-2026-89863
scsi: qla2xxx: edif: Fix NULL pointer deref in RX SA delete check
Published 2026-09-16 (33 days ago) by the Linux kernel CNA. Subsystem drivers/scsi. Debian urgency: not yet assigned.
What to do, per Debian release
Debian's own status for CVE-2026-89863 in every release this site tracks, and what each one means in practice. Every status below is the one the Debian Security Team publishes for this CVE. source
| Release | Status | Version | What this means |
|---|---|---|---|
| Debian 12bookworm | fixedDLA-4841-1 · 2026-10-17 · text | 6.1.190-1 | Update the kernel and reboot. DLA-4841-1 shipped the fix on 2026-10-17, in 6.1.190-1. A running kernel keeps the old code until the machine restarts. |
| Debian 13trixie | fixedDSA-6528-1 · 2026-09-29 · text | 6.12.111-1 | Update the kernel and reboot. DSA-6528-1 shipped the fix on 2026-09-29, in 6.12.111-1. A running kernel keeps the old code until the machine restarts. |
| Debian 14forky | fixed | 7.2.6-1 | Update the kernel and reboot. Fixed in 7.2.6-1. A running kernel keeps the old code until the machine restarts. |
| Debian unstablesid | fixed | 7.2.6-1 | Update the kernel and reboot. Fixed in 7.2.6-1. A running kernel keeps the old code until the machine restarts. |
| Debian 12bookworm · linux-6.12 | fixedDLA-4817-1 · 2026-10-04 · text | 6.12.111-1~deb12u1 | Update the kernel and reboot. DLA-4817-1 shipped the fix on 2026-10-04, in 6.12.111-1~deb12u1. A running kernel keeps the old code until the machine restarts. |
The vulnerability
What the bug is
qla_chk_edif_rx_sa_delete_pending() obtains the SCSI command via GET_CMD_SP(sp) and immediately dereferences cmd->sc_data_direction. That command pointer can be NULL: the firmware may post a status completion for a command that has already been returned or aborted. The caller qla2x00_status_entry() acknowledges this on the very same status path, re-fetching GET_CMD_SP(sp) and bailing out with the "Command already returned" message when it is NULL -- but that check runs only after qla_chk_edif_rx_sa_delete_pending() has already dereferenced the pointer, so a NULL cmd crashes the kernel in interrupt context. Return early when cmd is NULL, before touching cmd->sc_data_direction.
Where it lives
The fix touches these files. If the subsystem is one you do not use, the practical exposure is lower, though the package is still the vulnerable one.
drivers/scsi/qla2xxx/qla_edif.c
- What this is
- QLOGIC QLA2XXX FC-SCSI DRIVERMAINTAINERS section matched on drivers/scsi/qla2xxx/ · linux-scsi@vger.kernel.org · Supported
- Kernel module
- qla2xxx
Check it on the machine
grep -w CONFIG_SCSI_QLA_FC /boot/config-$(uname -r)Reads the booted kernel's own configuration, on the machine and nowhere else. =y is built in, =m is a module, and an is not set line means the code is not there.
lsmod | grep -w qla2xxxPrints a line if that module is loaded right now, and nothing if it is not. One that is not loaded can still be loaded later by anything that needs it.
Show whether Debian builds this, per release
Debian builds this, but not on every flavour. At least one release below builds the code on some of its kernel flavours and not on others, so the answer depends on the architecture and flavour installed.
- bookwormMnot built on amd64/cloud-amd64, arm64/cloud-arm64, armhf/armmp, armhf/armmp-lpae, armhf/rt/armmp
- trixieMnot built on amd64/cloud-amd64, arm64/cloud-arm64, armel/rpi, armhf/armmp, armhf/armmp-lpae, armhf/rt/armmp, s390x/s390x
- forky, sidMnot built on amd64/cloud-amd64, arm64/cloud-arm64, armhf/armmp, armhf/armmp-lpae, s390x/s390x
- bookworm · linux-6.12Mnot built on amd64/cloud-amd64, arm64/cloud-arm64, armhf/armmp, armhf/armmp-lpae, armhf/rt/armmp
- M
- a module where it is built at all; some flavours do not build it
- Build switch
- CONFIG_SCSI_QLA_FC
From the configuration Debian publishes for every kernel flavour it builds. It covers only the architectures Debian ships a linux-config package for, and nothing about a kernel you built yourself. Debian's own status above stays authoritative about the source package.MAINTAINERS kbuild Makefiles Debian linux-config packages
Signals
- Published
- 2026-09-16 (33 days ago)source
- CVSS
- 7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsource recompute it - Attack vector
- network (AV:N)source
- EPSS
- 0.67%, higher than 51.0% of all CVEssource
- CISA KEV
- not listedthe KEV catalogue
- Debian urgency
- not yet assignedsource
- Subsystem
- drivers/scsi
Upstream fixes
The versions the CNA records as introducing and fixing this, and the commit for each. source
| Introduced | Fixed in | Commit |
|---|---|---|
| 5.15 | 5.15.221 | e479e9b14845 |
| 5.15 | 6.1.188 | 2191b0034a2f |
| 5.15 | 6.6.157 | de0c8ef3b900 |
| 5.15 | 6.12.110 | 96eb8a3fc9f7 |
| 5.15 | 6.18.51 | 94bfb61478bc |
| 5.15 | 7.2.5 | 75fd6d041c4a |
| 5.15 | 7.3 | c20ee380ca59 |
Debian advisories
| Advisory | Date | Shipped to | Debian |
|---|---|---|---|
| DLA-4841-1 | 2026-10-17 | bookworm 6.1.190-1 | tracker |
| DLA-4817-1 | 2026-10-04 | bookworm 6.12.111-1~deb12u1 | tracker |
| DSA-6528-1 | 2026-09-29 | trixie 6.12.111-1 | tracker |
Why the CNA scored it this way
Quoted from the kernel CNA's own scoring file, word for word. A highlighted metric carries the most severe value CVSS v3.1 defines for it, which is what pushes the score up. source
- AV:NAttack vector, network
- qla_chk_edif_rx_sa_delete_pending() runs from qla2x00_status_entry() on STATUS_TYPE IOCBs the HBA firmware posts from a remote Fibre Channel or FCoE target's FCP_RSP. QLogic CNAs speak FCoE and SAN fabrics are stretched via FCIP, so a compromised target delivers late completions over the storage network with no local access.
- AC:LAttack complexity, low
- A hostile target controls FCP_RSP timing and can delay a response until SCSI error handling aborts and returns the command, then complete so firmware posts status for a NULL cmd. The same function already handles that case ("Command already returned"); the crash is then deterministic and needs no rare config or layout beyond a qla2xxx HBA.
- PR:NPrivileges required, none
- Completions are handled in the HBA interrupt/response-queue path (qla24xx_process_response_queue to qla2x00_status_entry) with no Linux credential or capability check; the attacker only needs to act as an FC/FCoE target on the fabric.
- UI:NUser interaction, none
- Once the target is visible on the fabric, the SCSI midlayer automatically issues commands (scan, path checks, mounted-filesystem I/O) whose STATUS_TYPE completions take the vulnerable path; no user mount, open, or other interactive step is required at exploit time.
- S:UScope, unchanged
- The NULL dereference and resulting oops stay inside the host kernel that owns the qla2xxx driver and do not cross a VM, IOMMU, or other separate security authority.
- C:NConfidentiality impact, none
- This is a pure NULL-pointer dereference of GET_CMD_SP(sp) (cmd->sc_data_direction at a NULL-page offset) when the SCSI command was already returned or aborted. There is no use-after-free of a live object, out-of-bounds read, or other kernel memory disclosure primitive.
- I:NIntegrity impact, none
- The cmd pointer is NULL, not a freed or attacker-controlled object, so the load cannot corrupt kernel heap, overwrite function pointers, or hijack control flow. The fix is only an early NULL return; there is no write primitive.
- A:HAvailability impact, high
- Dereferencing NULL cmd in qla_chk_edif_rx_sa_delete_pending() from the response-queue interrupt or qla_do_work() context oopses or panics the host, taking down all storage served by the adapter. A fabric peer can repeat this on aborted I/O.