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CVE-2026-63824— KEYS: fix overflow in keyctl_pkey_params_get_2()

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 4.20版本存在安全漏洞，该漏洞源于keyctl_pkey_params_get_2()函数中内部输出缓冲区的长度计算不正确，当提供过小的缓冲区时可能导致溢出。

CVSS 7.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 00d60fd3b93219ea854220f0fd264b86398cbc53< 622ec2dcd59f21623f2a7ab773c80ceb7d555e3a affected
00d60fd3b93219ea854220f0fd264b86398cbc53< b1e247338bc71826a2d2def3e0874c34749df69a affected
00d60fd3b93219ea854220f0fd264b86398cbc53< 0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3 affected
00d60fd3b93219ea854220f0fd264b86398cbc53< 5966e4e2ba213ab7ad559166152eb4f1f170dd2c affected
00d60fd3b93219ea854220f0fd264b86398cbc53< 5165f1cc727f1322456735df212d8e26ec237a8d affected
00d60fd3b93219ea854220f0fd264b86398cbc53< b11c1fa32667692a2c0566e10163758e786e430c affected
00d60fd3b93219ea854220f0fd264b86398cbc53< 670fc6a311ed321522b7fff92cf0fc376b4f6e78 affected
00d60fd3b93219ea854220f0fd264b86398cbc53< cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0b affected
… +10 more rows
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I. Basic Information for CVE-2026-63824

Vulnerability Information
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Vulnerability Title
KEYS: fix overflow in keyctl_pkey_params_get_2()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KEYS: fix overflow in keyctl_pkey_params_get_2() The length for the internal output buffer is calculated incorrectly, which can result overflow when a too small buffer is provided. Fix the bug by allocating internal output with the size of the maximum length of the cryptographic primitive instead of caller provided size.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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 4.20版本存在安全漏洞，该漏洞源于keyctl_pkey_params_get_2()函数中内部输出缓冲区的长度计算不正确，当提供过小的缓冲区时可能导致溢出。
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 00d60fd3b93219ea854220f0fd264b86398cbc53 ~ 622ec2dcd59f21623f2a7ab773c80ceb7d555e3a -
Linux Linux 4.20 -

II. Public POCs for CVE-2026-63824

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III. Intelligence Information for CVE-2026-63824

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Patches & Fixes for CVE-2026-63824 (8)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-63922 9.8 CRITICAL ipv6: exthdrs: refresh nh after handling HAO option
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes
CVE-2026-63857 9.8 CRITICAL net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()
CVE-2026-64160 9.8 CRITICAL netfs: Fix potential for tearing in ->remote_i_size and ->zero_point
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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