CVE-2026-93049

Description

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.

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EPSS — Exploit Prediction

0.0021

Probability of exploitation

0.11%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

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

Frequently Asked Questions

What is CVE-2026-93049? +

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.

How do I check if I'm vulnerable to CVE-2026-93049? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.