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CVE-2026-64217— netfs: Fix overrun check in netfs_extract_user_iter()

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 6.3版本存在安全漏洞，该漏洞源于netfs_extract_user_iter()函数中的溢出检查问题，可能导致内存破坏。

CVSS 7.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 85dd2c8ff368b1446be9febde84afe1d7aec4261< 00efe58bbdcc93272d579ca24bfc912563f4a204 affected
85dd2c8ff368b1446be9febde84afe1d7aec4261< 96cc3beb2390ba9f9c128c5733c0ccfe450dd4f9 affected
85dd2c8ff368b1446be9febde84afe1d7aec4261< afeb32d9bf9aaeea51d0f723a19f14afb73bd94d affected
85dd2c8ff368b1446be9febde84afe1d7aec4261< f48b9157f0f611fa436c360648603d5ded719b12 affected
85dd2c8ff368b1446be9febde84afe1d7aec4261< 0ef37eef83fad3542ee06db2940433ae1a92b39d affected
6.3 affected
< 6.3 unaffected
6.6.142≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-64217

Vulnerability Information
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Vulnerability Title
netfs: Fix overrun check in netfs_extract_user_iter()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix overrun check in netfs_extract_user_iter() Fix netfs_extract_user_iter() so that if iov_iter_extract_pages() overfills pages[], then those pages don't get included in the iterator constructed at the end of the function. If there was an overfill, memory corruption has already happened.
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 6.3版本存在安全漏洞，该漏洞源于netfs_extract_user_iter()函数中的溢出检查问题，可能导致内存破坏。
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 85dd2c8ff368b1446be9febde84afe1d7aec4261 ~ 00efe58bbdcc93272d579ca24bfc912563f4a204 -
Linux Linux 6.3 -

II. Public POCs for CVE-2026-64217

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III. Intelligence Information for CVE-2026-64217

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Patches & Fixes for CVE-2026-64217 (5)

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-2026-64251 7.8 HIGH pwrseq: core: fix use-after-free in pwrseq_debugfs_seq_next()
CVE-2026-64226 7.8 HIGH sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path
CVE-2026-64221 7.8 HIGH spi: ti-qspi: fix use-after-free after DMA setup failure
CVE-2026-64218 7.8 HIGH batman-adv: bla: fix report_work leak on backbone_gw purge
CVE-2026-64208 7.5 HIGH crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks
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-2026-64252 MIPS: DEC: Prevent initial console buffer from landing in XKPHYS
CVE-2026-64224 octeontx2-pf: fix double free in rvu_rep_rsrc_init()
CVE-2026-64250 LoongArch: Report dying CPU to RCU in stop_this_cpu()
CVE-2026-64248 MIPS: smp: report dying CPU to RCU in stop_this_cpu()
CVE-2026-64254 NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR

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-2026-64217

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