CVE-2026-43232

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-06. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets

When the FarSync T-series card is being detached, the fst_card_info is deallocated in fst_remove_one(). However, the fst_tx_task or fst_int_task may still be running or pending, leading to use-after-free bugs when the already freed fst_card_info is accessed in fst_process_tx_work_q() or fst_process_int_work_q().

A typical race condition is depicted below:

CPU 0 (cleanup) | CPU 1 (tasklet) | fst_start_xmit() fst_remove_one() | tasklet_schedule() unregister_hdlc_device()| | fst_process_tx_work_q() //handler kfree(card) //free | do_bottom_half_tx() | card-> //use

The following KASAN trace was captured:

================================================================== BUG: KASAN: slab-use-after-free in do_bottom_half_tx+0xb88/0xd00 Read of size 4 at addr ffff88800aad101c by task ksoftirqd/3/32 ... Call Trace: dump_stack_lvl+0x55/0x70 print_report+0xcb/0x5d0 ? do_bottom_half_tx+0xb88/0xd00 kasan_report+0xb8/0xf0 ? do_bottom_half_tx+0xb88/0xd00 do_bottom_half_tx+0xb88/0xd00 ? _raw_spin_lock_irqsave+0x85/0xe0 ? __pfx__raw_spin_lock_irqsave+0x10/0x10 ? __pfx___hrtimer_run_queues+0x10/0x10 fst_process_tx_work_q+0x67/0x90 tasklet_action_common+0x1fa/0x720 ? hrtimer_interrupt+0x31f/0x780 handle_softirqs+0x176/0x530 __irq_exit_rcu+0xab/0xe0 sysvec_apic_timer_interrupt+0x70/0x80 ...

Allocated by task 41 on cpu 3 at 72.330843s: kasan_save_stack+0x24/0x50 kasan_save_track+0x17/0x60 __kasan_kmalloc+0x7f/0x90 fst_add_one+0x1a5/0x1cd0 local_pci_probe+0xdd/0x190 pci_device_probe+0x341/0x480 really_probe+0x1c6/0x6a0 __driver_probe_device+0x248/0x310 driver_probe_device+0x48/0x210 __device_attach_driver+0x160/0x320 bus_for_each_drv+0x101/0x190 __device_attach+0x198/0x3a0 device_initial_probe+0x78/0xa0 pci_bus_add_device+0x81/0xc0 pci_bus_add_devices+0x7e/0x190 enable_slot+0x9b9/0x1130 acpiphp_check_bridge.part.0+0x2e1/0x460 acpiphp_hotplug_notify+0x36c/0x3c0 acpi_device_hotplug+0x203/0xb10 acpi_hotplug_work_fn+0x59/0x80 ...

Freed by task 41 on cpu 1 at 75.138639s: kasan_save_stack+0x24/0x50 kasan_save_track+0x17/0x60 kasan_save_free_info+0x3b/0x60 __kasan_slab_free+0x43/0x70 kfree+0x135/0x410 fst_remove_one+0x2ca/0x540 pci_device_remove+0xa6/0x1d0 device_release_driver_internal+0x364/0x530 pci_stop_bus_device+0x105/0x150 pci_stop_and_remove_bus_device+0xd/0x20 disable_slot+0x116/0x260 acpiphp_disable_and_eject_slot+0x4b/0x190 acpiphp_hotplug_notify+0x230/0x3c0 acpi_device_hotplug+0x203/0xb10 acpi_hotplug_work_fn+0x59/0x80 ...

The buggy address belongs to the object at ffff88800aad1000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 28 bytes inside of freed 1024-byte region The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xaad0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x100000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0100000000000040 ffff888007042dc0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 0100000000000040 ffff888007042dc0 dead000000000122 0000000000000000 head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 0100000000000003 ffffea00002ab401 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected

Memory state around the buggy address: ffff88800aad0f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88800aad0f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88800aad1000: fa fb ---truncated---

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
31.0%
KEV
Not listed

Published

May 6, 2026

Last Modified

May 12, 2026

Advisory Details (8)

Auto-updated May 12, 2026
No patch confirmed yet.
generic

net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cac048ebfbb92d91d719f74b59177cb70a7633b8
generic

net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bae8a5d2e759da2e0cba33ab2080deee96a09373
generic

net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ae894e47e1cd5a6bf8a0423d888c45df8b2b02dc
generic

net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/337d7b4112a47984ee319171b75b73bab47e7924
generic

net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/21d341fe514fd07e345ed264c9eee21cb2061ca2
generic

net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/200bdb8d367ca9b478f9c56ebe56411604d55c81
generic

net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/086131807d119238cd464e5b0845e48d938dfd79
generic

net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/04edfdfdfcdefc02408ab670607261b0a0a9a02e

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 103 total refreshes for this CVE.

  1. 2026-07-19 14:31 UTCEPSS rescore
  2. 2026-07-19 02:29 UTCEPSS rescore
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  1. 2026-06-23 21:33 UTCEPSS rescore
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  13. 2026-06-15 06:24 UTCGHSA enrichment
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  20. 2026-06-12 08:02 UTCGHSA enrichment
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  25. 2026-06-10 21:53 UTCGHSA enrichment
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  28. 2026-06-10 10:32 UTCGHSA enrichment
  29. 2026-06-09 23:02 UTCGHSA enrichment
  30. 2026-06-09 10:47 UTCGHSA enrichment
  31. 2026-06-08 23:25 UTCGHSA enrichment
  32. 2026-06-08 14:17 UTCEPSS rescore
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  38. 2026-06-07 13:19 UTCGHSA enrichment
  39. 2026-06-07 01:56 UTCGHSA enrichment
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  41. 2026-06-06 13:47 UTCEPSS rescore
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  43. 2026-06-06 03:11 UTCGHSA enrichment
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  48. 2026-06-05 04:28 UTCGHSA enrichment
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  50. 2026-06-04 13:12 UTCEPSS rescore
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  52. 2026-06-04 05:45 UTCGHSA enrichment
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  74. 2026-05-20 22:38 UTCEPSS rescore
  75. 2026-05-20 14:13 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-43232?
CVE-2026-43232 is a high vulnerability published on May 6, 2026. In the Linux kernel, the following vulnerability has been resolved: net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets When the FarSync T-series card is being detached, the fstcardinfo is deallocated in fstremoveone(). However, the fsttxtask or fstinttask may still be running…
When was CVE-2026-43232 disclosed?
CVE-2026-43232 was first published in the National Vulnerability Database on May 6, 2026, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43232 actively exploited?
CVE-2026-43232 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43232?
CVE-2026-43232 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-43232?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43232, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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