crypto: krb5 - filter out async aead implementations at alloc

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64439
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:28 UTC
Updated2026-07-25 10:17:28 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: crypto: krb5 - filter out async aead implementations at alloc krb5_aead_encrypt(), krb5_aead_decrypt() in rfc3961_simplified.c and rfc8009_encrypt(), rfc8009_decrypt() in rfc8009_aes2.c set a NULL completion callback and treat any negative return from crypto_aead_{encrypt,decrypt}() as terminal, falling through to kfree_sensitive(buffer). When the encrypt_name resolves to an async AEAD instance the request returns -EINPROGRESS, the buffer is freed while the backend's worker still holds a pointer, and the worker dereferences the freed slab on completion. KASAN report under UML+SLUB with a synthetic async aead backend bound to krb5->encrypt_name: BUG: KASAN: slab-use-after-free in t5_stub_complete+0x7d/0xc7 The helpers were written synchronously, so filter the async instances out at allocation time instead of plumbing crypto_wait_req() through every call site. Reachable via net/rxrpc/rxgk.c, fs/afs/cm_security.c and net/ceph/crypto.c on systems with an async AEAD provider bound to the krb5 enctype name.

Risk And Classification

EPSS: 0.002060000 probability, percentile 0.108610000 (date 2026-07-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 00244da40f7821b242c4612428d4192230dba27f ef6feb77e2d91761427c5b773edc9c97e1b706ad git Not specified
CNA Linux Linux affected 00244da40f7821b242c4612428d4192230dba27f 2b7bd6dccff14b8b632c5244f1fd506918077221 git Not specified
CNA Linux Linux affected 00244da40f7821b242c4612428d4192230dba27f 6c9dddeb582fde005360f4fe02c760d45ca05fb5 git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ef6feb77e2d91761427c5b773edc9c97e1b706ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6c9dddeb582fde005360f4fe02c760d45ca05fb5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b7bd6dccff14b8b632c5244f1fd506918077221 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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