CVE-2026-23428

CRITICALNVD 9.87.8▼
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-04-03. NVD baseline CVSS 9.8; sources differ by 2.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: 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:

ksmbd: fix use-after-free of share_conf in compound request

smb2_get_ksmbd_tcon() reuses work->tcon in compound requests without validating tcon->t_state. ksmbd_tree_conn_lookup() checks t_state == TREE_CONNECTED on the initial lookup path, but the compound reuse path bypasses this check entirely.

If a prior command in the compound (SMB2_TREE_DISCONNECT) sets t_state to TREE_DISCONNECTED and frees share_conf via ksmbd_share_config_put(), subsequent commands dereference the freed share_conf through work->tcon->share_conf.

KASAN report:

[ 4.144653] ================================================================== [ 4.145059] BUG: KASAN: slab-use-after-free in smb2_write+0xc74/0xe70 [ 4.145415] Read of size 4 at addr ffff88810430c194 by task kworker/1:1/44 [ 4.145772] [ 4.145867] CPU: 1 UID: 0 PID: 44 Comm: kworker/1:1 Not tainted 7.0.0-rc3+ #60 PREEMPTLAZY [ 4.145871] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 4.145875] Workqueue: ksmbd-io handle_ksmbd_work [ 4.145888] Call Trace: [ 4.145892] [ 4.145894] dump_stack_lvl+0x64/0x80 [ 4.145910] print_report+0xce/0x660 [ 4.145919] ? __pfx__raw_spin_lock_irqsave+0x10/0x10 [ 4.145928] ? smb2_write+0xc74/0xe70 [ 4.145931] kasan_report+0xce/0x100 [ 4.145934] ? smb2_write+0xc74/0xe70 [ 4.145937] smb2_write+0xc74/0xe70 [ 4.145939] ? __pfx_smb2_write+0x10/0x10 [ 4.145942] ? _raw_spin_unlock+0xe/0x30 [ 4.145945] ? ksmbd_smb2_check_message+0xeb2/0x24c0 [ 4.145948] ? smb2_tree_disconnect+0x31c/0x480 [ 4.145951] handle_ksmbd_work+0x40f/0x1080 [ 4.145953] process_one_work+0x5fa/0xef0 [ 4.145962] ? assign_work+0x122/0x3e0 [ 4.145964] worker_thread+0x54b/0xf70 [ 4.145967] ? __pfx_worker_thread+0x10/0x10 [ 4.145970] kthread+0x346/0x470 [ 4.145976] ? recalc_sigpending+0x19b/0x230 [ 4.145980] ? __pfx_kthread+0x10/0x10 [ 4.145984] ret_from_fork+0x4fb/0x6c0 [ 4.145992] ? __pfx_ret_from_fork+0x10/0x10 [ 4.145995] ? __switch_to+0x36c/0xbe0 [ 4.145999] ? __pfx_kthread+0x10/0x10 [ 4.146003] ret_from_fork_asm+0x1a/0x30 [ 4.146013] [ 4.146014] [ 4.149858] Allocated by task 44: [ 4.149953] kasan_save_stack+0x33/0x60 [ 4.150061] kasan_save_track+0x14/0x30 [ 4.150169] __kasan_kmalloc+0x8f/0xa0 [ 4.150274] ksmbd_share_config_get+0x1dd/0xdd0 [ 4.150401] ksmbd_tree_conn_connect+0x7e/0x600 [ 4.150529] smb2_tree_connect+0x2e6/0x1000 [ 4.150645] handle_ksmbd_work+0x40f/0x1080 [ 4.150761] process_one_work+0x5fa/0xef0 [ 4.150873] worker_thread+0x54b/0xf70 [ 4.150978] kthread+0x346/0x470 [ 4.151071] ret_from_fork+0x4fb/0x6c0 [ 4.151176] ret_from_fork_asm+0x1a/0x30 [ 4.151286] [ 4.151332] Freed by task 44: [ 4.151418] kasan_save_stack+0x33/0x60 [ 4.151526] kasan_save_track+0x14/0x30 [ 4.151634] kasan_save_free_info+0x3b/0x60 [ 4.151751] __kasan_slab_free+0x43/0x70 [ 4.151861] kfree+0x1ca/0x430 [ 4.151952] __ksmbd_tree_conn_disconnect+0xc8/0x190 [ 4.152088] smb2_tree_disconnect+0x1cd/0x480 [ 4.152211] handle_ksmbd_work+0x40f/0x1080 [ 4.152326] process_one_work+0x5fa/0xef0 [ 4.152438] worker_thread+0x54b/0xf70 [ 4.152545] kthread+0x346/0x470 [ 4.152638] ret_from_fork+0x4fb/0x6c0 [ 4.152743] ret_from_fork_asm+0x1a/0x30 [ 4.152853] [ 4.152900] The buggy address belongs to the object at ffff88810430c180 [ 4.152900] which belongs to the cache kmalloc-96 of size 96 [ 4.153226] The buggy address is located 20 bytes inside of [ 4.153226] freed 96-byte region [ffff88810430c180, ffff88810430c1e0) [ 4.153549] [ 4.153596] The buggy address belongs to the physical page: [ 4.153750] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88810430ce80 pfn:0x10430c [ 4.154000] flags: 0x ---truncated---

CVSS v3
9.8
EG Score
7.8(medium)
EPSS
25.2%
KEV
Not listed

Published

April 3, 2026

Last Modified

April 27, 2026

Advisory Details (7)

Auto-updated May 10, 2026
No patch confirmed yet.
generic

ksmbd: fix use-after-free of share_conf in compound request - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/eae0dc86f71e6f3294c0cd7ffc05039258d243af
generic

ksmbd: fix use-after-free of share_conf in compound request - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d08417981155883068b7260d9500ca306a03edac
generic

ksmbd: fix use-after-free of share_conf in compound request - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c742b46a153d3ff95ff0825ab1950c87b9e14470
generic

ksmbd: fix use-after-free of share_conf in compound request - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c33615f995aee80657b9fdfbc4ee7f49c2bd733d
generic

ksmbd: fix use-after-free of share_conf in compound request - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a5929c2020ce54e1dcbd1078c0f30b8aaf73c105
generic

ksmbd: fix use-after-free of share_conf in compound request - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/806f13752652216db0c309392b4db3e64eeed4f2
generic

ksmbd: fix use-after-free of share_conf in compound request - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7f7468fd2a7554cea91b7d430335a3dbf01dcc09

Vendor Advisories for CVE-2026-23428(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 49× 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 115 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
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  31. 2026-06-11 22:04 UTCGHSA enrichment
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  38. 2026-06-10 03:22 UTCGHSA enrichment
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  40. 2026-06-09 14:35 UTCGHSA enrichment
  41. 2026-06-08 14:17 UTCEPSS rescore
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  43. 2026-06-08 13:23 UTCEG score recompute
  44. 2026-06-08 13:23 UTCGHSA enrichment
  45. 2026-06-08 00:37 UTCEG score recompute
  46. 2026-06-08 00:37 UTCGHSA enrichment
  47. 2026-06-07 15:25 UTCEPSS rescore
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  49. 2026-06-07 10:57 UTCEG score recompute
  50. 2026-06-07 10:57 UTCGHSA enrichment
  51. 2026-06-06 13:47 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-23428?
CVE-2026-23428 is a critical vulnerability published on April 3, 2026. In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free of share_conf in compound request smb2getksmbd_tcon() reuses work->tcon in compound requests without validating tcon->tstate. ksmbdtreeconnlookup() checks t_state == TREE_CONNECTED on the initial lookup…
When was CVE-2026-23428 disclosed?
CVE-2026-23428 was first published in the National Vulnerability Database on April 3, 2026, with the most recent update on April 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23428 actively exploited?
CVE-2026-23428 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 25.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23428?
CVE-2026-23428 has a CVSS v3 base score of 9.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.8.
How do I remediate CVE-2026-23428?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23428, 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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