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CVE-2026-74396— RDMA/mlx5: Fix UMR XLT cleanup on ODP populate failure

CVSS 7.5 · High EPSS 0.52% · P42

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinux1efe8c0670d6a6883faa09c9abc746c741f5664a< ffa85a2c197935ace6f1634ad9eb0a44bc615670affected
1efe8c0670d6a6883faa09c9abc746c741f5664a< 9619909d4869afe720904c6888a289b9ac3055b8affected
1efe8c0670d6a6883faa09c9abc746c741f5664a< 1eae35b37923cb71b0cb5136d00671440d488b9faffected
6.16affected
< 6.16unaffected
6.18.40≤ 6.18.*unaffected
7.1.5≤ 7.1.*unaffected
7.2≤ *unaffected
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I. Basic Information for CVE-2026-74396

Vulnerability Information
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Vulnerability Title
RDMA/mlx5: Fix UMR XLT cleanup on ODP populate failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix UMR XLT cleanup on ODP populate failure mlx5r_umr_update_xlt() allocates and DMA maps an XLT buffer with mlx5r_umr_create_xlt(). The buffer is released by the common cleanup path through mlx5r_umr_unmap_free_xlt(). After mlx5_odp_populate_xlt() became fallible, its error path returned directly and skipped that cleanup. This leaks the XLT DMA mapping and buffer. If the emergency XLT page was used, it also leaves xlt_emergency_page_mutex locked. Break out of the loop so execution falls through the existing cleanup path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 6.16版本存在安全漏洞，该漏洞源于mlx5_odp_populate_xlt()失败时错误路径直接返回，跳过XLT缓冲区清理，导致DMA映射和缓冲区泄漏，并可能使紧急XLT页互斥锁保持锁定，可能导致拒绝服务攻击。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 1efe8c0670d6a6883faa09c9abc746c741f5664a ~ ffa85a2c197935ace6f1634ad9eb0a44bc615670 -
LinuxLinux 6.16 -

II. Public POCs for CVE-2026-74396

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III. Intelligence Information for CVE-2026-74396

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Patches & Fixes for CVE-2026-74396 (3)

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

CVE-2026-7430910.0 CRITICALvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-7428010.0 CRITICALcrypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-7427910.0 CRITICALcrypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-7240710.0 CRITICALgeneve: validate inner network offset in geneve_gro_complete()
CVE-2026-7240810.0 CRITICALgeneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-7447510.0 CRITICALvxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-7242110.0 CRITICALipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-724939.9 CRITICALnet: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-743769.8 CRITICALmd/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-722349.8 CRITICALbatman-adv: access unicast_ttvn skb->data only after skb realloc
CVE-2026-723399.8 CRITICALqede: fix off-by-one in BD ring consumption on build_skb failure
CVE-2026-742559.8 CRITICALtipc: fix UAF in tipc_l2_send_msg()
CVE-2026-720649.8 CRITICALnet: mana: Sync page pool RX frags for CPU
CVE-2026-720659.8 CRITICALnet: mana: Validate the packet length reported by the NIC
CVE-2026-722179.8 CRITICALSUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-744739.8 CRITICALvxlan: use pskb_network_may_pull() in route_shortcircuit()
CVE-2026-723239.8 CRITICALipv4: igmp: Fix potential UAF in igmp_gq_start_timer()
CVE-2026-744959.8 CRITICALigbvf: Fix leak in TX DMA error cleanup
CVE-2026-724639.8 CRITICALxfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-720699.8 CRITICALlocking/rt: Fix the incorrect RCU protection in rt_spin_unlock()

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-2026-74396

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