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Linux Kernel CVE-2026-43413

| EUVDEUVD-2026-28719 MEDIUM
NULL Pointer Dereference (CWE-476)
2026-05-08 Linux GHSA-3crh-xxfm-7qqg
Linux Null Pointer Dereference Denial Of Service Red Hat Suse
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative
Red Hat
5.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Analysis Generated
May 21, 2026 - 18:22 vuln.today
CVSS changed
May 21, 2026 - 18:22 NVD
5.5 (MEDIUM)
Patch available
May 08, 2026 - 16:18 EUVD
CVE Published
May 08, 2026 - 14:21 nvd
UNKNOWN (no severity yet)

DescriptionCVE.org

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

scsi: hisi_sas: Fix NULL pointer exception during user_scan()

user_scan() invokes updated sas_user_scan() for channel 0, and if successful, iteratively scans remaining channels (1 to shost->max_channel) via scsi_scan_host_selected() in commit 37c4e72b0651 ("scsi: Fix sas_user_scan() to handle wildcard and multi-channel scans"). However, hisi_sas supports only one channel, and the current value of max_channel is

  1. sas_user_scan() for channel 1 will trigger the following NULL pointer

exception:

[ 441.554662] Unable to handle kernel NULL pointer dereference at virtual address 00000000000008b0 [ 441.554699] Mem abort info: [ 441.554710] ESR = 0x0000000096000004 [ 441.554718] EC = 0x25: DABT (current EL), IL = 32 bits [ 441.554723] SET = 0, FnV = 0 [ 441.554726] EA = 0, S1PTW = 0 [ 441.554730] FSC = 0x04: level 0 translation fault [ 441.554735] Data abort info: [ 441.554737] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 [ 441.554742] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 441.554747] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 441.554752] user pgtable: 4k pages, 48-bit VAs, pgdp=00000828377a6000 [ 441.554757] [00000000000008b0] pgd=0000000000000000, p4d=0000000000000000 [ 441.554769] Internal error: Oops: 0000000096000004 [#1] SMP [ 441.629589] Modules linked in: arm_spe_pmu arm_smmuv3_pmu tpm_tis_spi hisi_uncore_sllc_pmu hisi_uncore_pa_pmu hisi_uncore_l3c_pmu hisi_uncore_hha_pmu hisi_uncore_ddrc_pmu hisi_uncore_cpa_pmu hns3_pmu hisi_ptt hisi_pcie_pmu tpm_tis_core spidev spi_hisi_sfc_v3xx hisi_uncore_pmu spi_dw_mmio fuse hclge hclge_common hisi_sec2 hisi_hpre hisi_zip hisi_qm hns3 hisi_sas_v3_hw sm3_ce sbsa_gwdt hnae3 hisi_sas_main uacce hisi_dma i2c_hisi dm_mirror dm_region_hash dm_log dm_mod [ 441.670819] CPU: 46 UID: 0 PID: 6994 Comm: bash Kdump: loaded Not tainted 7.0.0-rc2+ #84 PREEMPT [ 441.691327] pstate: 81400009 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) [ 441.698277] pc : sas_find_dev_by_rphy+0x44/0x118 [ 441.702896] lr : sas_find_dev_by_rphy+0x3c/0x118 [ 441.707502] sp : ffff80009abbba40 [ 441.710805] x29: ffff80009abbba40 x28: ffff082819a40008 x27: ffff082810c37c08 [ 441.717930] x26: ffff082810c37c28 x25: ffff082819a40290 x24: ffff082810c37c00 [ 441.725054] x23: 0000000000000000 x22: 0000000000000001 x21: ffff082819a40000 [ 441.732179] x20: ffff082819a40290 x19: 0000000000000000 x18: 0000000000000020 [ 441.739304] x17: 0000000000000000 x16: ffffb5dad6bda690 x15: 00000000ffffffff [ 441.746428] x14: ffff082814c3b26c x13: 00000000ffffffff x12: ffff082814c3b26a [ 441.753553] x11: 00000000000000c0 x10: 000000000000003a x9 : ffffb5dad5ea94f4 [ 441.760678] x8 : 000000000000003a x7 : ffff80009abbbab0 x6 : 0000000000000030 [ 441.767802] x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000 [ 441.774926] x2 : ffff08280f35a300 x1 : ffffb5dad7127180 x0 : 0000000000000000 [ 441.782053] Call trace: [ 441.784488] sas_find_dev_by_rphy+0x44/0x118 (P) [ 441.789095] sas_target_alloc+0x24/0xb0 [ 441.792920] scsi_alloc_target+0x290/0x330 [ 441.797010] __scsi_scan_target+0x88/0x258 [ 441.801096] scsi_scan_channel+0x74/0xb8 [ 441.805008] scsi_scan_host_selected+0x170/0x188 [ 441.809615] sas_user_scan+0xfc/0x148 [ 441.813267] store_scan+0x10c/0x180 [ 441.816743] dev_attr_store+0x20/0x40 [ 441.820398] sysfs_kf_write+0x84/0xa8 [ 441.824054] kernfs_fop_write_iter+0x130/0x1c8 [ 441.828487] vfs_write+0x2c0/0x370 [ 441.831880] ksys_write+0x74/0x118 [ 441.835271] __arm64_sys_write+0x24/0x38 [ 441.839182] invoke_syscall+0x50/0x120 [ 441.842919] el0_svc_common.constprop.0+0xc8/0xf0 [ 441.847611] do_el0_svc+0x24/0x38 [ 441.850913] el0_svc+0x38/0x158 [ 441.854043] el0t_64_sync_handler+0xa0/0xe8 [ 441.858214] el0t_64_sync+0x1ac/0x1b0 [ 441.861865] Code: aa1303e0 97ff70a8 34ffff80 d10a4273 (f9445a75) [ 441.867946] ---[ end trace 0000000000000000 ]---

Therefore ---truncated---

AnalysisAI

NULL pointer dereference in the Linux kernel's hisi_sas SCSI driver crashes systems when a local user triggers a host scan via sysfs. Authenticated local users with low privileges can write to the sysfs scan interface, causing kernel oops due to a channel iteration bug introduced in commit 37c4e72b0651 - the driver supports only one channel (channel 0) but its max_channel is set to 1, causing sas_user_scan() to attempt scanning channel 1 where no valid SAS device structure exists. The result is a denial-of-service via kernel NULL pointer dereference at sas_find_dev_by_rphy(). No public exploit or CISA KEV listing has been identified; EPSS is 0.02% (5th percentile), consistent with low-likelihood opportunistic exploitation.

Technical ContextAI

The vulnerability resides in the hisi_sas driver (Hisilicon SAS v3 HW), a SCSI-over-SAS subsystem component used in HiSilicon-based ARM64 servers (CPE: cpe:2.3:a:linux:linux). The root cause (CWE-476, NULL Pointer Dereference) is a logic mismatch: user_scan() calls the updated sas_user_scan() for channel 0, then iterates channels 1 through shost->max_channel via scsi_scan_host_selected(). Because hisi_sas is a single-channel controller, there is no SAS port or device structure for channel 1. When sas_user_scan() invokes sas_target_alloc() → sas_find_dev_by_rphy(), it dereferences a NULL pointer at virtual address 0x8b0, triggering an ARM64 DABT (Data Abort) level-0 translation fault. The offending call trace runs through kernfs_fop_write_iter → store_scan → sas_user_scan → scsi_scan_host_selected → sas_find_dev_by_rphy+0x44, confirming the sysfs write path as the trigger.

RemediationAI

Upgrade to a patched kernel release: 6.6.x users should apply 6.6.130 or later; 6.12.x users should apply 6.12.78 or later; 6.18.x users should apply 6.18.19 or later; 6.19.x users should apply 6.19.9 or later; users on the 7.0 development series should apply the fix commit. Upstream patch commits are available at https://git.kernel.org/stable/c/70c78429ef383e35f9c58848994aeeac8083ae35, https://git.kernel.org/stable/c/40119a21d9769bf8fdab5c93c6c878296e628abf, https://git.kernel.org/stable/c/21a13db8d449b9c7eda4471da7f12417602dbbc7, https://git.kernel.org/stable/c/beadac156610a4f3bb15cb7bb4b07b6ac06f6567, and https://git.kernel.org/stable/c/8ddc0c26916574395447ebf4cff684314f6873a9. As a workaround on unpatched systems, restrict write access to the sysfs scan attribute (e.g., via filesystem permissions or SELinux/AppArmor policy denying writes to /sys/class/scsi_host/hostN/scan for unprivileged users) - note this may impact legitimate storage management tooling that relies on sysfs-triggered rescans.

Same weakness CWE-476 – NULL Pointer Dereference

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CVE-2016-0742 HIGH
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CVE-2014-3470 MEDIUM
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CVE-2017-3730 HIGH POC
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CVE-2017-3169 CRITICAL POC
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CVE-2016-4957 HIGH
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CVE-2015-3194 HIGH
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CVE-2026-21525 MEDIUM
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Same technique Null Pointer Dereference

View all
CVE-2016-0742 HIGH
7.5
CVE-2014-3470 MEDIUM
4.3
CVE-2017-3730 HIGH POC
7.5
CVE-2017-3169 CRITICAL POC
9.8
CVE-2016-4957 HIGH
7.5
CVE-2015-3194 HIGH
7.5
CVE-2026-21525 MEDIUM
6.2
CVE-2017-0016 MEDIUM
5.9

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2026-43413 vulnerability details – vuln.today
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