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CVE-2026-72389— bridge: stp: Fix a potential use-after-free when deleting a bridge

CVSS 7.8 · High EPSS 0.16% · P6

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 16

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< c86579b0a2d201792bcb59316629f4ba4758cfc8affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 297a747f59bff6573196d7236178144d66524e68affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4c40eec06eeac37c58e47a6058eb32901218d5d4affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 39283907a25e5caf0f2bd2947f6e56644b01e2b7affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b4b3458ef88df4798632619f018791d4344bcd92affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 40cbfa3a28e0919469d1b086629bb3ce38a83593affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2a00517db8de4be7df3d483b215c5544fb30a191affected
2.6.12affected
… +8 more rows
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I. Basic Information for CVE-2026-72389

Vulnerability Information
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Vulnerability Title
bridge: stp: Fix a potential use-after-free when deleting a bridge
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bridge: stp: Fix a potential use-after-free when deleting a bridge The three STP timers are not supposed to be armed while the bridge is administratively down. They are synchronously deactivated when the bridge is put administratively down and the various call sites check for 'IFF_UP' before arming them. This check is missing from br_topology_change_detection() and it is possible to engineer a situation in which the topology change timer is armed while the bridge is administratively down, resulting in a use-after-free [1] when the bridge is deleted. Fix by adding the missing check and for good measures synchronously shutdown the three timers when the bridge is deleted. [1] ODEBUG: free active (active state 0) object: ffff88811662b9b0 object type: timer_list hint: br_topology_change_timer_expired (net/bridge/br_stp_timer.c:120) WARNING: lib/debugobjects.c:629 at debug_print_object+0x1bc/0x450, CPU#9: ip/359
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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 2.6.12版本存在安全漏洞，该漏洞源于br_topology_change_detection函数缺少IFF_UP检查，可能导致释放后重用。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ c86579b0a2d201792bcb59316629f4ba4758cfc8 -
LinuxLinux 2.6.12 -

II. Public POCs for CVE-2026-72389

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III. Intelligence Information for CVE-2026-72389

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Patches & Fixes for CVE-2026-72389 (6)

Same Patch Batch · Linux · 2026-08-15 · 846 CVEs total

CVE-2026-7428010.0 CRITICALcrypto: marvell/octeontx - 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-2026-7427910.0 CRITICALcrypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-7447510.0 CRITICALvxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-7430910.0 CRITICALvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
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-2026-724639.8 CRITICALxfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-722489.8 CRITICALnetfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-723819.8 CRITICALksmbd: fix use-after-free of fp->owner.name in durable handle owner check
CVE-2026-724779.8 CRITICALfs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-724739.8 CRITICALxprtrdma: Decouple req recycling from RPC completion
CVE-2026-724729.8 CRITICALnfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-744069.8 CRITICALvxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().
CVE-2026-722219.8 CRITICALsunrpc: wait for in-flight TLS handshake callback when cancel loses race
CVE-2026-721379.8 CRITICALxfrm: nat_keepalive: avoid double free on send error
CVE-2026-743769.8 CRITICALmd/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-744019.8 CRITICALdlm: fix add msg handle in send_queue ordered
CVE-2026-722349.8 CRITICALbatman-adv: access unicast_ttvn skb->data only after skb realloc

Showing top 20 of 846 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72389

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