CVE-2026-89843 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20506318
- published5 Oct 2026
- disclosed16 Sept 2026
Introduced: 16 Sep 2026
NewCVE-2026-89843 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-89843
- https://git.kernel.org/stable/c/1c820d0900e4aacd5020b989159f6b4b2f7d0d6a
- https://git.kernel.org/stable/c/26bc6a2c235a70bfc9b6de412600208aca820e20
- https://git.kernel.org/stable/c/4fe5790674097897a1af1367d1e384f7e5a62fb7
- https://git.kernel.org/stable/c/5ab32dff910291b5e6bf6223f8a4003536c1800a
- https://git.kernel.org/stable/c/708c0ec1e09c52fee24b74ce9398bf3f8d1c83fd
- https://git.kernel.org/stable/c/7881faf862ee301ecfe3adc0725bd2fa0021cd95
- https://git.kernel.org/stable/c/947c6bfcf7f5ec924995bec43e3108b98c75b44e
- https://git.kernel.org/stable/c/b93d3bb3afe1b44489927de1eb4e66e8536a5935