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CVE-2026-43336— lib/crypto: chacha: Zeroize permuted_state before it leaves scope

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ChaCha加密中局部变量permuted_state在离开作用域前未清零，由于ChaCha置换是可逆的，该变量足以计算原始状态和密钥。

CVSS 7.5 · High EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1408.002

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c08d0e647305c3f8f640010a56c9e4bafb9488d3< e90ee961af515a484f091678ce58a4c3f7b73b02 affected
c08d0e647305c3f8f640010a56c9e4bafb9488d3< b416a4245f04a450c67a13e6d96056c37c5b33fe affected
c08d0e647305c3f8f640010a56c9e4bafb9488d3< bd62d9b44464a6c20a34a74068e7a784d0afa04a affected
c08d0e647305c3f8f640010a56c9e4bafb9488d3< 066c760acead1fb743bae294dbd89f479ae43b9b affected
c08d0e647305c3f8f640010a56c9e4bafb9488d3< 1d761e5a7340c46479fb2399598f331e4fe2c633 affected
c08d0e647305c3f8f640010a56c9e4bafb9488d3< 1933249263c3a98df79992f61a566476e4163bcc affected
c08d0e647305c3f8f640010a56c9e4bafb9488d3< 91999af43ca2125e3b2c18fcfc02912ada02efc3 affected
c08d0e647305c3f8f640010a56c9e4bafb9488d3< e5046823f8fa3677341b541a25af2fcb99a5b1e0 affected
… +10 more rows
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I. Basic Information for CVE-2026-43336

Vulnerability Information
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Vulnerability Title
lib/crypto: chacha: Zeroize permuted_state before it leaves scope
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: lib/crypto: chacha: Zeroize permuted_state before it leaves scope Since the ChaCha permutation is invertible, the local variable 'permuted_state' is sufficient to compute the original 'state', and thus the key, even after the permutation has been done. While the kernel is quite inconsistent about zeroizing secrets on the stack (and some prominent userspace crypto libraries don't bother at all since it's not guaranteed to work anyway), the kernel does try to do it as a best practice, especially in cases involving the RNG. Thus, explicitly zeroize 'permuted_state' before it goes out of scope.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ChaCha加密中局部变量permuted_state在离开作用域前未清零，由于ChaCha置换是可逆的，该变量足以计算原始状态和密钥。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux c08d0e647305c3f8f640010a56c9e4bafb9488d3 ~ e90ee961af515a484f091678ce58a4c3f7b73b02 -
Linux Linux 4.2 -

II. Public POCs for CVE-2026-43336

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III. Intelligence Information for CVE-2026-43336

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Patches & Fixes for CVE-2026-43336 (8)

Same Patch Batch · Linux · 2026-05-08 · 197 CVEs total

CVE-2026-43341 9.8 CRITICAL net/ipv6: ioam6: prevent schema length wraparound in trace fill
CVE-2026-43402 9.8 CRITICAL kthread: consolidate kthread exit paths to prevent use-after-free
CVE-2026-43414 9.8 CRITICAL scsi: qla2xxx: Completely fix fcport double free
CVE-2026-43384 9.8 CRITICAL net/tcp-ao: Fix MAC comparison to be constant-time
CVE-2026-43304 9.8 CRITICAL libceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-43379 9.8 CRITICAL ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-43376 9.8 CRITICAL ksmbd: fix use-after-free by using call_rcu() for oplock_info
CVE-2026-43465 9.8 CRITICAL net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
CVE-2026-43378 9.8 CRITICAL smb: server: fix use-after-free in smb2_open()
CVE-2026-43383 9.4 CRITICAL net/tcp-md5: Fix MAC comparison to be constant-time
CVE-2026-43406 9.1 CRITICAL libceph: prevent potential out-of-bounds reads in process_message_header()
CVE-2026-43407 9.1 CRITICAL libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
CVE-2026-43284 8.8 HIGH xfrm: esp: avoid in-place decrypt on shared skb frags
CVE-2026-43334 8.8 HIGH Bluetooth: SMP: force responder MITM requirements before building the pairing response
CVE-2026-43322 8.8 HIGH Bluetooth: hci_sync: Fix UAF in le_read_features_complete
CVE-2026-43403 8.8 HIGH nsfs: tighten permission checks for ns iteration ioctls
CVE-2026-43391 8.8 HIGH nsfs: tighten permission checks for handle opening
CVE-2026-43291 8.3 HIGH net: nfc: nci: Fix parameter validation for packet data
CVE-2026-43365 8.2 HIGH xfs: fix undersized l_iclog_roundoff values
CVE-2026-43466 8.2 HIGH net/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery

Showing top 20 of 197 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43336

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