Unknown

CVE-2026-89843 — scsi: qla2xxx: Zero-init bsg stack buffers to avoid info leak

In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Zero-init bsg stack buffers to avoid info leak Several bsg handlers stage their request/reply in an uninitialized 256-byte on-stack buffer (uint8_t bsg[DMA_POOL_SIZE]) and fill it via sg_copy_to_buffer(), which only copies as many bytes as the user-supplied request payload. When the request is shorter than the structure, the remainder of the buffer is left holding stale stack data. qla2x00_read_fru_status() and qla2x00_read_i2c() then copy the full structure back to the reply payload with sg_copy_from_buffer(), leaking the uninitialized stack bytes to user space. The write/update paths do not copy the buffer back, but can feed uninitialized fields to the device. Zero the stack buffer at declaration in all five handlers, mirroring the heap kzalloc() approach, so short requests can no longer expose stale memory.

Published Sep 16, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.21%

ahead of 11% of scored CVEs · Oct 20, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 and < 1c820d0900e4aacd5020b989159f6b4b2f7d0d6a≥ 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 and < 26bc6a2c235a70bfc9b6de412600208aca820e20≥ 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 and < 5ab32dff910291b5e6bf6223f8a4003536c1800a≥ 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 and < 947c6bfcf7f5ec924995bec43e3108b98c75b44e≥ 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 and < 708c0ec1e09c52fee24b74ce9398bf3f8d1c83fd≥ 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 and < 4fe5790674097897a1af1367d1e384f7e5a62fb7≥ 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 and < 7881faf862ee301ecfe3adc0725bd2fa0021cd95≥ 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 and < b93d3bb3afe1b44489927de1eb4e66e8536a5935 and 1 more version 3.2	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 20, 2026 · 5 reading(s) · max 0.21%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 16, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

10 on the record

git.kernel.org/stable/c/b93d3bb3afe1b44489927de1eb4e66e8536a5935
NIST National Vulnerability Database
git.kernel.org/stable/c/947c6bfcf7f5ec924995bec43e3108b98c75b44e
NIST National Vulnerability Database
git.kernel.org/stable/c/1c820d0900e4aacd5020b989159f6b4b2f7d0d6a
NIST National Vulnerability Database
git.kernel.org/stable/c/26bc6a2c235a70bfc9b6de412600208aca820e20
NIST National Vulnerability Database
git.kernel.org/stable/c/4fe5790674097897a1af1367d1e384f7e5a62fb7
NIST National Vulnerability Database
git.kernel.org/stable/c/7881faf862ee301ecfe3adc0725bd2fa0021cd95
NIST National Vulnerability Database
github.com/advisories/GHSA-x3rh-x4gx-m2j8
GitHub Security Advisories
nvd.nist.gov/vuln/detail/CVE-2026-89843
GitHub Security Advisories
git.kernel.org/stable/c/708c0ec1e09c52fee24b74ce9398bf3f8d1c83fd
NIST National Vulnerability Database
git.kernel.org/stable/c/5ab32dff910291b5e6bf6223f8a4003536c1800a
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-98869 bpf: Infer zext_dst based on static register liveness analysis 1h
Unknown CVE-2023-7356 Bluetooth: ISO: Copy BASE if service data matches EIR_BAA_SERVICE_UUID 1h
Unknown CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 3d
Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 3d
Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 3d
Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 3d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-89843 is "scsi: qla2xxx: Zero-init bsg stack buffers to avoid info leak", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.21% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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