CVE-2026-93049 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-LINUX612-20506770
- published5 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
NewCVE-2026-93049 (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:
mtd: mtdswap: Avoid freeing registered blktrans device twice
In mtdswap_add_mtd(), debugfs setup failure after successful blktrans registration can free mbd_dev twice.
add_mtd_blktrans_dev() initializes the blktrans device reference and publishes the disk. Once that succeeds, del_mtd_blktrans_dev() tears the disk down and drops the blktrans reference; when that reference reaches zero, blktrans_dev_release() frees the mtd_blktrans_dev.
The debugfs failure path called del_mtd_blktrans_dev(mbd_dev), then fell through the common cleanup label and called kfree(mbd_dev) again. Clear the local pointer after deregistration so the common cleanup can still release the mtdswap state without freeing the blktrans object twice.
This issue was found by a static analysis checker and confirmed by manual source review.
References
- https://security-tracker.debian.org/tracker/CVE-2026-93049
- https://git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c
- https://git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9
- https://git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777
- https://git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87
- https://git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901
- https://git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4
- https://git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1
- https://git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726