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CVE-2026-98298— dmaengine: mmp_pdma: fix wrong sg length in mmp_pdma_prep_slave_sg()

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，已修复以下漏洞： dmaengine: mmp_pdma：修正 mmp_pdma_prep_slave_sg() 中散射表（scatterlist）长度错误 在 函数中， 宏用于遍历散射表，并将每个条目依次赋值给变量 。然而，代码中却从 （散射列表头）而非 （当前条目）中读取长度： 因此， 始终为第一个条目的长度。对于包含多个散射条目的列表，如果后续条目的长度小于第一个条目，则会导致越界读取（out-of-bounds read）；如果后续条目的长度大于第一个条目，则会导致静默数据丢失（si

AI Predicted 5.3 Difficulty: Easy EPSS 0.18% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c8acd6aa6bed3c0fd7898202f4ebc534db9085f2< f448a5f5bd10d792440a1b08cf2e8f311767032d affected
c8acd6aa6bed3c0fd7898202f4ebc534db9085f2< 2148db529f082d6e3ca95413bf943442f4ef30cc affected
c8acd6aa6bed3c0fd7898202f4ebc534db9085f2< d920c07aa6d89ec11afdb6976aafaee9563a5234 affected
c8acd6aa6bed3c0fd7898202f4ebc534db9085f2< 4a33886057e6d127555efb022879c583e966acc5 affected
c8acd6aa6bed3c0fd7898202f4ebc534db9085f2< 88a505330eb06128f7ce79a4c5e4832b7601b3d1 affected
c8acd6aa6bed3c0fd7898202f4ebc534db9085f2< bae65e4925928f77824ca0103122e2ed20ef5802 affected
c8acd6aa6bed3c0fd7898202f4ebc534db9085f2< 54ccc01012a240476edf641bf1a2b8bff54fe6ae affected
c8acd6aa6bed3c0fd7898202f4ebc534db9085f2< 075bc7b1d3dde5ed43fbaabbc1a69f09b7fc3a47 affected
… +10 more rows
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I. Basic Information for CVE-2026-98298

Vulnerability Information
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Vulnerability Title
dmaengine: mmp_pdma: fix wrong sg length in mmp_pdma_prep_slave_sg()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: mmp_pdma: fix wrong sg length in mmp_pdma_prep_slave_sg() In mmp_pdma_prep_slave_sg(), for_each_sg() iterates the scatterlist putting each entry into 'sg', but the entry length is read from 'sgl' (the list head) instead of 'sg' (the current entry): for_each_sg(sgl, sg, sg_len, i) { addr = sg_dma_address(sg); avail = sg_dma_len(sgl); /* should be 'sg' */ Consequently 'avail' is always the length of the first entry. For multi-sg lists this causes out-of-bounds reads when a later entry is shorter than the first, and silent data loss when it is longer. Single-sg or uniformly-sized lists happen to mask the issue.
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 c8acd6aa6bed3c0fd7898202f4ebc534db9085f2 ~ f448a5f5bd10d792440a1b08cf2e8f311767032d -
Linux Linux 3.7 -

II. Public POCs for CVE-2026-98298

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III. Intelligence Information for CVE-2026-98298

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Patches & Fixes for CVE-2026-98298 (7)

Same Patch Batch · Linux · 2026-10-06 · 208 CVEs total

CVE-2026-98323 9.8 CRITICAL RDMA/siw: Bound fragmented header copies by the remaining length
CVE-2026-98365 9.8 CRITICAL RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
CVE-2026-98282 8.8 HIGH powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba
CVE-2026-98283 8.8 HIGH KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()
CVE-2026-98339 8.8 HIGH wifi: cfg80211: don't filter by BSS type when removing stale entries
CVE-2026-98171 8.8 HIGH smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
CVE-2026-98261 8.1 HIGH cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
CVE-2026-98357 8.1 HIGH IB/isert: wait for deferred control PDU completions before releasing the connection
CVE-2026-98239 8.1 HIGH net: lan743x: fix RX checksum use-after-free
CVE-2026-98305 7.8 HIGH net: dsa: mxl862xx: disable the stats poll on teardown
CVE-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
CVE-2026-98320 7.8 HIGH netfilter: flowtable: hold reference on ct until flow is released
CVE-2026-98228 7.8 HIGH mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ
CVE-2026-98229 7.8 HIGH xfrm: save input state data before secpath resets
CVE-2026-98318 7.8 HIGH smb: client: validate absolute native symlink targets before NT fixups
CVE-2026-98315 7.8 HIGH ntfs: protect runlist updates with the runlist lock
CVE-2026-98260 7.8 HIGH exec: Cleanup POSIX timers right after de_thread()
CVE-2026-98256 7.8 HIGH signal: Prevent exec() race
CVE-2026-98258 7.8 HIGH posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list
CVE-2026-98254 7.8 HIGH swiotlb: use the adjusted address for the highmem page lookup

Showing top 20 of 208 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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