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CVE-2026-74726— bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor

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.

在 Linux 内核中，以下漏洞已得到修复： bonding（网络绑定）：alb 模式 – 在 中于持有 RTNL 锁期间重新检查 状态 函数在读取 时使用的是 RCU（Read-Copy-Update）机制，随后释放 RCU 锁，并通过 获取 RTNL（路由网络锁），以撤销其对活动从属接口（active slave）之前设置的混杂模式（promiscuity）。然而，在该时间窗口内，当前的活动从属接口可能在持有 RTNL 锁的情况下发生变化（路径： → → ）。此变更过程已撤销混杂模式并清除了 标志。但监控函数仍

AI Predicted 5.5 Difficulty: Moderate EPSS 0.22% · P13

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux d0e81b7e2246a41d068ecaf15aac9de570816d63< f7668762bf5fd6db9397de5c0514407489d9d815 affected
d0e81b7e2246a41d068ecaf15aac9de570816d63< 09add8d5cfa9c46828f51eaad162c36e86366b71 affected
d0e81b7e2246a41d068ecaf15aac9de570816d63< b82f51681a7a88c7d3c865e817a3340d42b5fa2a affected
d0e81b7e2246a41d068ecaf15aac9de570816d63< dd148539fb4741d01c06b7d2c8bd84b01920756c affected
d0e81b7e2246a41d068ecaf15aac9de570816d63< dccec0227ed8d9e36936d66e256b957dc2858468 affected
d0e81b7e2246a41d068ecaf15aac9de570816d63< 2faf75a8a06504071b4c0aea7e45a9cc49a4e187 affected
d0e81b7e2246a41d068ecaf15aac9de570816d63< 257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2 affected
d0e81b7e2246a41d068ecaf15aac9de570816d63< 683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d affected
… +10 more rows
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I. Basic Information for CVE-2026-74726

Vulnerability Information
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Vulnerability Title
bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor bond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and takes RTNL via rtnl_trylock() before undoing the promiscuity it set on the active slave. In that window the active slave can change under RTNL (RTM_DELLINK -> __bond_release_one() -> bond_alb_handle_active_change()), which already drops the promiscuity and clears primary_is_promisc. The monitor still acts on the stale decision: if the slave was removed with no failover, curr_active_slave is now NULL and the deref faults; if it failed over, the stale dev_set_promiscuity(-1) underflows the new slave's promiscuity counter and pins it in IFF_PROMISC. Oops: general protection fault, probably for non-canonical address ... KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] Workqueue: b42 bond_alb_monitor RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600) process_one_work (kernel/workqueue.c:3322) worker_thread (kernel/workqueue.c:3486) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) Kernel panic - not syncing: Fatal exception Re-check primary_is_promisc (and curr_active_slave) after taking RTNL so the monitor only undoes an increment it still owns. The other bonding monitors already re-read state under RTNL in their commit phase (bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only one acting on the pre-trylock decision.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux d0e81b7e2246a41d068ecaf15aac9de570816d63 ~ f7668762bf5fd6db9397de5c0514407489d9d815 -
Linux Linux 2.6.24 -

II. Public POCs for CVE-2026-74726

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III. Intelligence Information for CVE-2026-74726

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Patches & Fixes for CVE-2026-74726 (8)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74638 drm/v3d: Serialize the scheduler timeout handlers
CVE-2026-74621 net/sched: act_ct: fix sk_buff leak when the header checks reject a packet
CVE-2026-74622 net: atlantic: free RX pages of consumed but not refilled buffers
CVE-2026-74623 net: atlantic: free stranded TX buffers on ring deinit
CVE-2026-74624 netfilter: nf_conntrack: defer invalid log until after unlock
CVE-2026-74625 netfilter: bridge: release template ct on non-IP path
CVE-2026-74627 net: devmem: prevent net-iov / page mixing
CVE-2026-74626 NTB: ntb_netdev: Preserve RX queue depth on allocation failure
CVE-2026-74628 net/x25: fix use-after-free of the socket by its timers
CVE-2026-74629 net/dibs: Correct freeing of dmb_clientid_arr
CVE-2026-74631 net: smc: fix splice entry lifetime imbalance in smc_rx_splice
CVE-2026-74630 ipv6: prevent in6_dev_get() from resurrecting inet6_dev
CVE-2026-74632 mm/huge_memory: fix huge_zero_pfn race
CVE-2026-74633 tracing: Fix NULL pointer dereference in module event cache removal
CVE-2026-74634 ring-buffer: Prevent subbuf order change when resizing is disabled
CVE-2026-74635 fbdev: bitblit: bound-check glyph index in bit_cursor()
CVE-2026-74636 tracing: Fix race between update_event_fields and, event_define_fields
CVE-2026-74637 perf/core: Fix group leader use-after-free after sibling detach
CVE-2026-74639 ALSA: us144mkii: re-anchor capture URBs on resubmission
CVE-2026-74650 staging: rtl8723bs: fix OOB read in WMM_param_handler()

Showing top 20 of 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74726

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