s390/zcrypt: Fix buffer over-read in cca_cipher2protkey

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68453
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-13 15:19:58 UTC
Updated2026-08-13 15:19:58 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Fix buffer over-read in cca_cipher2protkey Add validation of both the actual key buffer size and token length fields in all the cca_check_sec*token() functions. Additionally check in cca_gencipherkey() for possible underflow with returned key size. The CCA token structures contain user-controlled len fields that were used in operations without proper validation against both the actual buffer size and minimum token structure size. An attacker could set this field larger than the actual buffer size, leading to reading beyond buffer boundaries. This may result in a kernel crash or exposure of memory via sending this as part of a request down to the crypto card. Also an attacker could have used a very small len value and thus enforce a buffer under-run which may produce similar effects as a over-read. So now a key must - key buf length must be at least sizeof the token struct - the key len field inside the token must fit into the range of sizeof key token struct ... key buf length

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd a57fd7fcdb63e2d5ceac78bbe825ec986062a9da git Not specified
CNA Linux Linux affected 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd 3b2abee2a678607ae27975bc6833785c2002df43 git Not specified
CNA Linux Linux affected 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd 36b230835b8a008266aad22168ca52afacc8a58d git Not specified
CNA Linux Linux affected 5.4 Not specified
CNA Linux Linux unaffected 5.4 semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3b2abee2a678607ae27975bc6833785c2002df43 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/36b230835b8a008266aad22168ca52afacc8a58d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a57fd7fcdb63e2d5ceac78bbe825ec986062a9da 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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