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CVE-2026-72138— xen/gntdev: fix error handling in ioctl

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gntdev_ioctl_map_grant_ref函数错误处理不当，可能导致内存泄漏和悬空列表项。

AI Predicted 5.5 Difficulty: Easy EPSS 0.21% · P12

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 68b025c813c2eb41ff25628e3d4952d5185eb1a4< 52dc40ef0cfee6ae89b7524967e73f0ba37906d7 affected
68b025c813c2eb41ff25628e3d4952d5185eb1a4< 1dd9cb98fe228e017fff9efb33862ff38c741b65 affected
68b025c813c2eb41ff25628e3d4952d5185eb1a4< 6df926130aee6cab9b5d2e5b7862e49ccac348dc affected
68b025c813c2eb41ff25628e3d4952d5185eb1a4< 311011f8cc206c5af2877b03e3f627ee1b8fe024 affected
68b025c813c2eb41ff25628e3d4952d5185eb1a4< 18a693733f7ad004e1ab0466693121ca70cd95dd affected
68b025c813c2eb41ff25628e3d4952d5185eb1a4< 16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454 affected
68b025c813c2eb41ff25628e3d4952d5185eb1a4< 6883269a323609f68f6faa903f8f8ff3d191cec8 affected
68b025c813c2eb41ff25628e3d4952d5185eb1a4< 45ca1afe2fd14c04e37227e79d3f8455831d8408 affected
… +10 more rows
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I. Basic Information for CVE-2026-72138

Vulnerability Information
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Vulnerability Title
xen/gntdev: fix error handling in ioctl
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xen/gntdev: fix error handling in ioctl When gntdev_ioctl_map_grant_ref() fails to copy the operation result back to userspace after successfully adding the mapping to the list, the error path returns -EFAULT without releasing the reference acquired by gntdev_alloc_map(). The mapping remains in priv->maps with a refcount of 1, causing a memory leak and a dangling list entry. Additionally, gntdev_add_map() may modify map->index to avoid overlap with existing mappings. Therefore, the index returned to userspace must be obtained after gntdev_add_map() completes. Fix this by holding the mutex across gntdev_add_map(), retrieving the correct index, and copy_to_user(). If copy_to_user() fails, remove the mapping from the list and release the reference while still holding the lock. Fix these issues by properly handling all error cases.
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
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gntdev_ioctl_map_grant_ref函数错误处理不当，可能导致内存泄漏和悬空列表项。
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 68b025c813c2eb41ff25628e3d4952d5185eb1a4 ~ 52dc40ef0cfee6ae89b7524967e73f0ba37906d7 -
Linux Linux 2.6.39 -

II. Public POCs for CVE-2026-72138

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III. Intelligence Information for CVE-2026-72138

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Patches & Fixes for CVE-2026-72138 (8)

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

CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
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-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72201 9.8 CRITICAL ntfs: validate index entries on reading
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-74480 9.8 CRITICAL net: bridge: stop fast-leave after deleting a port group
CVE-2026-72191 9.8 CRITICAL ntfs3: validate split-point offset in indx_insert_into_buffer
CVE-2026-72192 9.8 CRITICAL ntfs3: bound to_move in indx_insert_into_root before hdr_insert_head
CVE-2026-74478 9.8 CRITICAL um: vector: fix use-after-free in vector_mmsg_rx()
CVE-2026-72194 9.8 CRITICAL fs/ntfs3: add depth limit to indx_find_buffer to prevent stack overflow
CVE-2026-74269 9.8 CRITICAL bnxt: fix head underflow on XDP head-grow
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72210 9.8 CRITICAL ntfs: fix off-by-one in mapping pairs decoding bounds checks

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-2026-72138

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