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CVE-2026-64208— crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks

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 6.16版本存在安全漏洞，该漏洞源于缺乏预解密/预验证长度检查，可能导致AF_RXRPC无法正确验证使用RxGK安全机制的数据包。

CVSS 7.5 · High EPSS 0.43% · P37

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a< 585f9f6aef5c4542ac9d6ec45cd7dbc7df9af3ff affected
9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a< 9217017f4bce53dddb8d547837f1f707045d64ad affected
9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a< 2b50aceafe6606ea52ed42aadd1b4d44a188aade affected
6.16 affected
< 6.16 unaffected
6.18.34≤ 6.18.* unaffected
7.0.11≤ 7.0.* unaffected
7.1≤ * unaffected
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I. Basic Information for CVE-2026-64208

Vulnerability Information
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Vulnerability Title
crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks Change the krb5 crypto library to provide facilities to precheck the length of the message about to be decrypted or verified. Fix AF_RXRPC to make use of this to validate DATA packets secured with RxGK.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 6.16版本存在安全漏洞，该漏洞源于缺乏预解密/预验证长度检查，可能导致AF_RXRPC无法正确验证使用RxGK安全机制的数据包。
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 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a ~ 585f9f6aef5c4542ac9d6ec45cd7dbc7df9af3ff -
Linux Linux 6.16 -

II. Public POCs for CVE-2026-64208

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III. Intelligence Information for CVE-2026-64208

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Patches & Fixes for CVE-2026-64208 (2)

Same Patch Batch · Linux · 2026-07-24 · 48 CVEs total

CVE-2026-64232 9.8 CRITICAL block: recompute nr_integrity_segments in blk_insert_cloned_request
CVE-2026-64216 9.8 CRITICAL netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages()
CVE-2026-64255 8.8 HIGH wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers
CVE-2026-64247 8.4 HIGH KVM: x86: hyper-v: Bound the bank index when querying sparse banks
CVE-2026-64235 8.1 HIGH x86/ftrace: Relocate %rip-relative percpu refs in dynamic trampolines
CVE-2026-64223 8.1 HIGH wifi: mac80211: consume only present negotiated TTLM maps
CVE-2026-64217 7.8 HIGH netfs: Fix overrun check in netfs_extract_user_iter()
CVE-2026-64218 7.8 HIGH batman-adv: bla: fix report_work leak on backbone_gw purge
CVE-2026-64221 7.8 HIGH spi: ti-qspi: fix use-after-free after DMA setup failure
CVE-2026-64226 7.8 HIGH sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path
CVE-2026-64251 7.8 HIGH pwrseq: core: fix use-after-free in pwrseq_debugfs_seq_next()
CVE-2026-64210 7.5 HIGH net/mlx5e: xsk: Fix unlocked writing to ICOSQ
CVE-2026-64243 7.1 HIGH ASoC: codecs: simple-mux: Fix enum control bounds check
CVE-2026-64219 7.0 HIGH drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_as
CVE-2026-64222 7.0 HIGH octeontx2-pf: avoid double free of pool->stack on AQ init failure
CVE-2026-64211 srcu: Don't queue workqueue handlers to never-online CPUs
CVE-2026-64225 octeontx2-af: CGX: add bounds check to cgx_speed_mbps index
CVE-2026-64212 wifi: iwlwifi: mld: don't dereference a pointer before NULL checking it
CVE-2026-64209 phy: qcom: qmp-usbc: Fix out-of-bounds array access in dp swing config
CVE-2026-64229 x86/mm: Disable broadcast TLB flush when PCID is disabled

Showing top 20 of 48 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64208

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