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CVE-2026-74495— igbvf: Fix leak in TX DMA error cleanup

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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于TX DMA错误清理过程中存在差一错误，可能导致DMA映射泄漏。

CVSS 9.8 · Critical EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1070 · Indicator Removal

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c1fa347f20f17f14a4a1575727fa24340e8a9117< e42b7225c45f57b42306b80cdd3bda202bae7293 affected
c1fa347f20f17f14a4a1575727fa24340e8a9117< e3ed89c257f6361f13df23023cd10ace830330ad affected
c1fa347f20f17f14a4a1575727fa24340e8a9117< 56726ff12cb6759ab90d6f5332c2377aeca7d249 affected
c1fa347f20f17f14a4a1575727fa24340e8a9117< 31089f4eab42e0fc248ec80c26f9b0bad59ba4cc affected
c1fa347f20f17f14a4a1575727fa24340e8a9117< bc25d56c03e41c10bc4b40e99ca5d7b941675c04 affected
c1fa347f20f17f14a4a1575727fa24340e8a9117< 845a9cdd9b03b7b6fa8de3ee80579780350a7f65 affected
c1fa347f20f17f14a4a1575727fa24340e8a9117< df07003b5a6c6c9fce60d765d6a3da815a74c41c affected
c1fa347f20f17f14a4a1575727fa24340e8a9117< 0565052b7e2f436b7f1541f4849da96dc0aa7a0e affected
… +10 more rows
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I. Basic Information for CVE-2026-74495

Vulnerability Information
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Vulnerability Title
igbvf: Fix leak in TX DMA error cleanup
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: igbvf: Fix leak in TX DMA error cleanup If an error is encountered while mapping TX buffers, the driver should unmap any buffers already mapped for that skb. Because count is incremented before each frag mapping, it will always match the correct number of unmappings needed when dma_error is reached. Decrementing count before the while loop in dma_error causes an off-by-one error. If any mapping was successful before an unsuccessful mapping, exactly one DMA mapping (the head) would leak. This bug was introduced by a 2010 fix for an endless loop in dma_error. All other affected drivers have already been fixed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于TX DMA错误清理过程中存在差一错误，可能导致DMA映射泄漏。
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 c1fa347f20f17f14a4a1575727fa24340e8a9117 ~ e42b7225c45f57b42306b80cdd3bda202bae7293 -
Linux Linux 2.6.33 -

II. Public POCs for CVE-2026-74495

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III. Intelligence Information for CVE-2026-74495

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Patches & Fixes for CVE-2026-74495 (7)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74427 9.8 CRITICAL afs: Fix netns teardown to cancel the preallocation charger
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-72208 9.8 CRITICAL ntfs: add bounds check before accessing EA entries
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO
CVE-2026-72466 9.8 CRITICAL xprtrdma: Fix bcall rep leak and unbounded peek

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74495

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