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CVE-2026-98843— netfs: zero gaps in read-gaps folio to avoid writing back stale data

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.

在 Linux 内核中，以下漏洞已得到修复： netfs：在读取间隙的页帧（folio）中填充零，以避免回写陈旧数据。 函数会在流式写入的脏区域周围留下服务器端未读取的间隙，因此当该处出现短读或文件结束（EOF）响应时，会导致页帧中残留陈旧内容，随后这些内容被错误地回写。 修复方案是在读取完成后再进行清零操作，而非在此之前： 在返回值 时返回 。因此，我们基于读取操作所使用的同一 bvec 数组构建一个迭代器，将迭代位置推进到 之后，并将剩余部分清零。由于脏区域在该数组中已映射到目标页（sink pages）而非真

AI Predicted 5.5 Difficulty: Hard EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1562

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux ee4cdf7ba857a894ad1650d6ab77669cbbfa329e< 512eaf01ffabf4258e945016b50df5aed940b705 affected
ee4cdf7ba857a894ad1650d6ab77669cbbfa329e< 2a62fe628a877c249c8286b157ee99d82840d9dc affected
ee4cdf7ba857a894ad1650d6ab77669cbbfa329e< 8db55c5cd831a786a1a2a2d391aa80354535a353 affected
6.12 affected
< 6.12 unaffected
6.18.56≤ 6.18.* unaffected
7.2.10≤ 7.2.* unaffected
7.3≤ * unaffected
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I. Basic Information for CVE-2026-98843

Vulnerability Information
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Vulnerability Title
netfs: zero gaps in read-gaps folio to avoid writing back stale data
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfs: zero gaps in read-gaps folio to avoid writing back stale data netfs_read_gaps() leaves gaps around a streaming write's dirty region unread on the server side, so a short/EOF response there left stale folio content that later got written back. Zero it after the read completes, not before: netfs_wait_for_read() returns rreq->transferred once ret >= 0, so build an iterator over the same bvec array the read used, advance past ret, and zero the rest. The dirty region already maps to sink pages in that array rather than the real folio, so this can't touch it, and only the actual shortfall gets zeroed instead of the whole gap upfront.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux ee4cdf7ba857a894ad1650d6ab77669cbbfa329e ~ 512eaf01ffabf4258e945016b50df5aed940b705 -
Linux Linux 6.12 -

II. Public POCs for CVE-2026-98843

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III. Intelligence Information for CVE-2026-98843

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Patches & Fixes for CVE-2026-98843 (1)

Same Patch Batch · Linux · 2026-10-18 · 435 CVEs total

CVE-2026-98719 KVM: SEV: Nullify "have run CPUs" mask pointer when freeing it
CVE-2026-98732 Bluetooth: btintel: fix buffer over-read in btintel_hw_error()
CVE-2026-98731 Bluetooth: btintel_pcie: fix plen overflow in btintel_pcie_recv_frame()
CVE-2026-98730 Bluetooth: btintel_pcie: reject oversized TX packets in send_frame()
CVE-2026-98729 x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h
CVE-2026-98728 tpm: fix off-by-four bounds check in tpm2_get_random()
CVE-2026-98727 nvme-multipath: set BLK_FEAT_ZONED only after the zone info is known
CVE-2026-98726 nvme-multipath: fix underflow in ANA log bounds checks
CVE-2026-98725 nvmet-auth: fix out-of-bounds write in nvmet_auth_challenge()
CVE-2026-98724 nvmet: pci-epf: reject too-short SGL segments
CVE-2026-98723 nvmet: copy the hostid into the ctrl before creating PR pc_refs
CVE-2026-98722 mtd: block2mtd: Fix divide error when erase_size is zero
CVE-2026-98721 mtd: rawnand: cadence: Initialize IRQ state before requesting IRQ
CVE-2026-98720 KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified
CVE-2026-98707 wifi: mac80211: shut down RX BA session timer on teardown
CVE-2026-98711 wifi: cw1200: fix TX padding OOB read leaking heap data to device
CVE-2026-98710 wifi: iwlegacy: 3945: free EEPROM data on remove
CVE-2026-98709 wifi: mac80211: count only matching reservations in reserved switch
CVE-2026-98712 KVM: arm64: vgic: Take a refcount on IRQs referenced by last_lr_irq
CVE-2026-98708 wifi: mac80211: keep paired old chanctx alive

Showing top 20 of 435 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98843

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