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CVE-2026-64313— crypto: ecc - Fix carry overflow in vli multiplication

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基金会开源的一款操作系统内核。 Linux kernel 4.8版本存在安全漏洞，该漏洞源于vli乘法中的carry标志计算失败，当r01.m_high饱和且低比特加法溢出时，条件判断不完整导致进位处理错误。

CVSS 8.8 · High EPSS 0.35% · P28

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 3c4b23901a0c766879dff680cd6bdab47bcdbbd2< d11b2bb99bec1f5557c01cac42231e23745f49b8 affected
3c4b23901a0c766879dff680cd6bdab47bcdbbd2< b709e0e768766abe29a49e1c1922a1604be602f4 affected
3c4b23901a0c766879dff680cd6bdab47bcdbbd2< 24a54dfa06d09813b4802a374fad3d2c0e16a884 affected
3c4b23901a0c766879dff680cd6bdab47bcdbbd2< 677450e5ef850c4d28b7956aa01104548c2a894e affected
3c4b23901a0c766879dff680cd6bdab47bcdbbd2< 5275e0fca256d081e2e7d4ba3dd8216c6e50d44e affected
3c4b23901a0c766879dff680cd6bdab47bcdbbd2< 774ddddf5eb26eeca177350413e3e2bc50930ee9 affected
3c4b23901a0c766879dff680cd6bdab47bcdbbd2< ebaae7c4251cc0cdb2602f334d4f08a3e82d271e affected
3c4b23901a0c766879dff680cd6bdab47bcdbbd2< 27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406 affected
… +10 more rows
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I. Basic Information for CVE-2026-64313

Vulnerability Information
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Vulnerability Title
crypto: ecc - Fix carry overflow in vli multiplication
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: crypto: ecc - Fix carry overflow in vli multiplication The carry flag calculation fails when r01.m_high is saturated (0xFFFFFFFFFFFFFFFF) and addition of lower bits overflows. The condition (r01.m_high < product.m_high) doesn't handle the case where r01.m_high == product.m_high and an additional carry exists from lower-bit overflow. When commit 3c4b23901a0c ("crypto: ecdh - Add ECDH software support") introduced crypto/ecc.c, it split the muladd() function in the micro-ecc library into separate mul_64_64() and add_128_128() helpers. It seems the check got lost in translation. Add proper handling for this boundary by accounting for the carry from the lower addition.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/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 4.8版本存在安全漏洞，该漏洞源于vli乘法中的carry标志计算失败，当r01.m_high饱和且低比特加法溢出时，条件判断不完整导致进位处理错误。
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 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 ~ d11b2bb99bec1f5557c01cac42231e23745f49b8 -
Linux Linux 4.8 -

II. Public POCs for CVE-2026-64313

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III. Intelligence Information for CVE-2026-64313

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Patches & Fixes for CVE-2026-64313 (8)

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

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
CVE-2026-64410 9.8 CRITICAL netfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-64399 9.8 CRITICAL ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-64397 9.8 CRITICAL ksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-64391 9.8 CRITICAL ksmbd: use opener credentials for ADS I/O
CVE-2026-64387 9.8 CRITICAL smb: client: fix query directory replay double-free
CVE-2026-64386 9.8 CRITICAL smb: client: fix query_info() replay double-free
CVE-2026-64385 9.8 CRITICAL smb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-64383 9.8 CRITICAL smb: client: fix double-free in SMB2_flush() replay
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64320 9.1 CRITICAL nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length
CVE-2026-64257 9.1 CRITICAL smb: client: reject overlapping data areas in SMB2 responses
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials

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-2026-64313

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