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CVE-2026-93049

mtd: mtdswap: Avoid freeing registered blktrans device twice

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From e8e3edb95ce6a146bc774b6cfad3553f4383edc8 · fixed in ecadb9137aeaa0615183f8d23eabea2b45c862f1; From e8e3edb95ce6a146bc774b6cfad3553f4383edc8 · fixed in eec130fc9ffbbd08a5d5432683122b79aca2a726; From e8e3edb95ce6a146bc774b6cfad3553f4383edc8 · fixed in d5086911d532b82ca070d944aa08ddde00baefe4; From e8e3edb95ce6a146bc774b6cfad3553f4383edc8 · fixed in 0ce48c6ddea1a8e675a2eb0221b62a9950788f3c; From e8e3edb95ce6a146bc774b6cfad3553f4383edc8 · fixed in a82d93fcfdfd26af17049c34319dfdd079cd1901; From e8e3edb95ce6a146bc774b6cfad3553f4383edc8 · fixed in 5c349c533e72af2313c3be0f80a24d7407fa4777; From e8e3edb95ce6a146bc774b6cfad3553f4383edc8 · fixed in 37be7bc2c2d09c18e939da20224405864a0090b9; From e8e3edb95ce6a146bc774b6cfad3553f4383edc8 · fixed in 779aa4c66a96bf43d2d62982ea1a9096a9128d87

  • Linux Linux

    4.14

  • KernelLinux

    From 4.14.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 8

git.kernel.org