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CVE-2026-64439— crypto: krb5 - filter out async aead implementations at alloc

CVSS 9.8 · Critical EPSS 0.43% · P35

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinux00244da40f7821b242c4612428d4192230dba27f< ef6feb77e2d91761427c5b773edc9c97e1b706adaffected
00244da40f7821b242c4612428d4192230dba27f< 2b7bd6dccff14b8b632c5244f1fd506918077221affected
00244da40f7821b242c4612428d4192230dba27f< 6c9dddeb582fde005360f4fe02c760d45ca05fb5affected
6.15affected
< 6.15unaffected
6.18.39≤ 6.18.*unaffected
7.1.4≤ 7.1.*unaffected
7.2-rc1≤ *unaffected
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I. Basic Information for CVE-2026-64439

Vulnerability Information
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Vulnerability Title
crypto: krb5 - filter out async aead implementations at alloc
Source: CVE Program / CVE List V5
Vulnerability Description
In 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.15版本存在安全漏洞，该漏洞源于krb5模块未正确处理异步AEAD实现，导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 00244da40f7821b242c4612428d4192230dba27f ~ ef6feb77e2d91761427c5b773edc9c97e1b706ad -
LinuxLinux 6.15 -

II. Public POCs for CVE-2026-64439

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III. Intelligence Information for CVE-2026-64439

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Patches & Fixes for CVE-2026-64439 (2)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-643559.8 CRITICALbpf: Reject fragmented frames in devmap
CVE-2026-644599.8 CRITICALtcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-643039.8 CRITICALspi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-644109.8 CRITICALnetfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-643999.8 CRITICALksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-643979.8 CRITICALksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-643919.8 CRITICALksmbd: use opener credentials for ADS I/O
CVE-2026-643879.8 CRITICALsmb: client: fix query directory replay double-free
CVE-2026-643869.8 CRITICALsmb: client: fix query_info() replay double-free
CVE-2026-643859.8 CRITICALsmb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-643839.8 CRITICALsmb: client: fix double-free in SMB2_flush() replay
CVE-2026-643849.8 CRITICALsmb: client: fix change notify replay double-free
CVE-2026-642689.8 CRITICALRDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-645239.8 CRITICALnet/handshake: Take a long-lived file reference at submit
CVE-2026-643939.1 CRITICALksmbd: run set info with opener credentials
CVE-2026-643929.1 CRITICALksmbd: use opener credentials for delete-on-close
CVE-2026-642699.1 CRITICALRDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-643209.1 CRITICALnvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page
CVE-2026-642579.1 CRITICALsmb: client: reject overlapping data areas in SMB2 responses
CVE-2026-643199.1 CRITICALnvmet-auth: validate reply message payload bounds against transfer length

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64439

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