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CVE-2026-72307— mlxsw: fix refcount leak in mlxsw_sp_vrs_lpm_tree_replace()

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 4.14版本存在安全漏洞，该漏洞源于mlxsw_sp_vrs_lpm_tree_replace()错误回滚循环未正确更新vr指针，导致引用计数泄漏。

AI Predicted 3.3 Difficulty: Moderate EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux fc922bb0dd9406dd9897fd47df958789891c380e< c2c75c45b54f3b12eafb28a4eb47f8821512c1aa affected
fc922bb0dd9406dd9897fd47df958789891c380e< 7203ac71d3895fa5948b319dd724f0e1cffbc4a1 affected
fc922bb0dd9406dd9897fd47df958789891c380e< f6454a5fbf2224ad30ec70e686a6c592561da1f2 affected
fc922bb0dd9406dd9897fd47df958789891c380e< 220d41bdce41fe5a39a7f419faab1e907b4093c2 affected
fc922bb0dd9406dd9897fd47df958789891c380e< 9e4a6185679922305ea1df68403f00ccc512656b affected
fc922bb0dd9406dd9897fd47df958789891c380e< 3a2b47d1b4b3de54d030a7fdb6a322c970513ee3 affected
fc922bb0dd9406dd9897fd47df958789891c380e< 8adebf07b46df79a0e49a6d4ae384f0db7c91db6 affected
fc922bb0dd9406dd9897fd47df958789891c380e< 21cf8dc478a49e8de039c2739b1646a774cb1944 affected
… +10 more rows
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I. Basic Information for CVE-2026-72307

Vulnerability Information
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Vulnerability Title
mlxsw: fix refcount leak in mlxsw_sp_vrs_lpm_tree_replace()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mlxsw: fix refcount leak in mlxsw_sp_vrs_lpm_tree_replace() When mlxsw_sp_vrs_lpm_tree_replace() fails after replacing some VRs, the error rollback loop does not correctly revert the preceding replacements. The loop decrements the index but fails to update the vr pointer, which still points to the VR that caused the failure. As a result, the condition and the rollback call always operate on the same VR, potentially calling mlxsw_sp_vr_lpm_tree_replace() multiple times on it while never rolling back the earlier VRs. Those VRs continue to hold a reference to new_tree acquired via mlxsw_sp_lpm_tree_hold(), leaking the reference count of new_tree. Fix by reinitializing vr inside the error loop with the updated index: vr = &mlxsw_sp->router->vrs[i]; so that the loop correctly iterates over all VRs that were actually replaced.
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 4.14版本存在安全漏洞，该漏洞源于mlxsw_sp_vrs_lpm_tree_replace()错误回滚循环未正确更新vr指针，导致引用计数泄漏。
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 fc922bb0dd9406dd9897fd47df958789891c380e ~ c2c75c45b54f3b12eafb28a4eb47f8821512c1aa -
Linux Linux 4.14 -

II. Public POCs for CVE-2026-72307

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III. Intelligence Information for CVE-2026-72307

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Patches & Fixes for CVE-2026-72307 (8)

Same Patch Batch · Linux · 2026-08-15 · 844 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-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
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-2026-72407 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-2026-74493 9.8 CRITICAL net/smc: fix socket use-after-free during link group termination
CVE-2026-72466 9.8 CRITICAL xprtrdma: Fix bcall rep leak and unbounded peek
CVE-2026-72463 9.8 CRITICAL xfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-72069 9.8 CRITICAL locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()
CVE-2026-74345 9.8 CRITICAL RDMA/siw: Fix endpoint/socket association handling
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-2026-72234 9.8 CRITICAL batman-adv: access unicast_ttvn skb->data only after skb realloc
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-74255 9.8 CRITICAL tipc: fix UAF in tipc_l2_send_msg()
CVE-2026-72339 9.8 CRITICAL qede: fix off-by-one in BD ring consumption on build_skb failure
CVE-2026-72351 9.8 CRITICAL gue: validate REMCSUM private option length

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72307

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