CVE-2026-68453 is a vulnerability in Linux Kernel
Published on August 13, 2026
s390/zcrypt: Fix buffer over-read in cca_cipher2protkey
In 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
Products Associated with CVE-2026-68453
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Affected Versions
Linux:- Version 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd and below a57fd7fcdb63e2d5ceac78bbe825ec986062a9da is affected.
- Version 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd and below 3b2abee2a678607ae27975bc6833785c2002df43 is affected.
- Version 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd and below 36b230835b8a008266aad22168ca52afacc8a58d is affected.
- Version 5.4 is affected.
- Before 5.4 is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2-rc6, <= * is unaffected.