zram: fix out-of-bounds access in read_block_state()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89719
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:20:00 UTC
Updated2026-09-11 20:20:00 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: zram: fix out-of-bounds access in read_block_state() read_block_state() calculates nr_pages before taking dev_lock. If the device is reset and reinitialized with a smaller disksize before lock acquisition, nr_pages still describes the old table. The subsequent loop can then call slot_lock() past the end of the newly allocated table. Read disksize after acquiring dev_lock and checking that the device is initialized. The read lock then keeps the table and its bound stable for the duration of the scan.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d git Not specified
CNA Linux Linux affected c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3 git Not specified
CNA Linux Linux affected c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 391f057f44a51cc9418da5cba78b014324174264 git Not specified
CNA Linux Linux affected 4.18 Not specified
CNA Linux Linux unaffected 4.18 semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/391f057f44a51cc9418da5cba78b014324174264 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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