Unity Linux 20.1070a Security Update: kernel (UTSA-2026-005807)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(300324);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/03");

  script_cve_id("CVE-2025-38203");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2026-005807)");

  script_set_attribute(attribute:"synopsis", value:
"The Unity Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the
UTSA-2026-005807 advisory.

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

    jfs: Fix null-ptr-deref in jfs_ioc_trim

    [ Syzkaller Report ]

    Oops: general protection fault, probably for non-canonical address
    0xdffffc0000000087: 0000 [#1
    KASAN: null-ptr-deref in range [0x0000000000000438-0x000000000000043f]
    CPU: 2 UID: 0 PID: 10614 Comm: syz-executor.0 Not tainted
    6.13.0-rc6-gfbfd64d25c7a-dirty #1
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
    Sched_ext: serialise (enabled+all), task: runnable_at=-30ms
    RIP: 0010:jfs_ioc_trim+0x34b/0x8f0
    Code: e7 e8 59 a4 87 fe 4d 8b 24 24 4d 8d bc 24 38 04 00 00 48 8d 93
    90 82 fe ff 4c 89 ff 31 f6
    RSP: 0018:ffffc900055f7cd0 EFLAGS: 00010206
    RAX: 0000000000000087 RBX: 00005866a9e67ff8 RCX: 000000000000000a
    RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000001
    RBP: dffffc0000000000 R08: ffff88807c180003 R09: 1ffff1100f830000
    R10: dffffc0000000000 R11: ffffed100f830001 R12: 0000000000000000
    R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000438
    FS:  00007fe520225640(0000) GS:ffff8880b7e80000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00005593c91b2c88 CR3: 000000014927c000 CR4: 00000000000006f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
    <TASK>
    ? __die_body+0x61/0xb0
    ? die_addr+0xb1/0xe0
    ? exc_general_protection+0x333/0x510
    ? asm_exc_general_protection+0x26/0x30
    ? jfs_ioc_trim+0x34b/0x8f0
    jfs_ioctl+0x3c8/0x4f0
    ? __pfx_jfs_ioctl+0x10/0x10
    ? __pfx_jfs_ioctl+0x10/0x10
    __se_sys_ioctl+0x269/0x350
    ? __pfx___se_sys_ioctl+0x10/0x10
    ? do_syscall_64+0xfb/0x210
    do_syscall_64+0xee/0x210
    ? syscall_exit_to_user_mode+0x1e0/0x330
    entry_SYSCALL_64_after_hwframe+0x77/0x7f
    RIP: 0033:0x7fe51f4903ad
    Code: c3 e8 a7 2b 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 48 89 f8 48
    89 f7 48 89 d6 48 89 ca 4d
    RSP: 002b:00007fe5202250c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
    RAX: ffffffffffffffda RBX: 00007fe51f5cbf80 RCX: 00007fe51f4903ad
    RDX: 0000000020000680 RSI: 00000000c0185879 RDI: 0000000000000005
    RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe520225640
    R13: 000000000000000e R14: 00007fe51f44fca0 R15: 00007fe52021d000
    </TASK>
    Modules linked in:
    ---[ end trace 0000000000000000 ]---
    RIP: 0010:jfs_ioc_trim+0x34b/0x8f0
    Code: e7 e8 59 a4 87 fe 4d 8b 24 24 4d 8d bc 24 38 04 00 00 48 8d 93
    90 82 fe ff 4c 89 ff 31 f6
    RSP: 0018:ffffc900055f7cd0 EFLAGS: 00010206
    RAX: 0000000000000087 RBX: 00005866a9e67ff8 RCX: 000000000000000a
    RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000001
    RBP: dffffc0000000000 R08: ffff88807c180003 R09: 1ffff1100f830000
    R10: dffffc0000000000 R11: ffffed100f830001 R12: 0000000000000000
    R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000438
    FS:  00007fe520225640(0000) GS:ffff8880b7e80000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00005593c91b2c88 CR3: 000000014927c000 CR4: 00000000000006f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Kernel panic - not syncing: Fatal exception

    [ Analysis ]

    We believe that we have found a concurrency bug in the `fs/jfs` module
    that results in a null pointer dereference. There is a closely related
    issue which has been fixed:

    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d6c1b3599b2feb5c7291f5ac3a36
    e5fa7cedb234

    ... but, unfortunately, the accepted patch appears to still be
    susceptible to a null pointer dereference under some interleavings.

    To trigger the bug, we think that `JFS_SBI(ipbmap->i_sb)->bmap` is set
    to NULL in `dbFreeBits` and then dereferenced in `jfs_ioc_trim`. This
    bug manifests quite rarely under normal circumstances, but is
    triggereable from a syz-program.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://src.uniontech.com/#/security_advisory_detail?utsa_id=UTSA-2026-005807
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c972644d");
  # https://lore.kernel.org/linux-cve-announce/2025070419-CVE-2025-38203-8c33@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0e9a3ba9");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-38203");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-38203");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/07/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Unity Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/UOS-Server/release", "Host/UOS-Server/rpm-list", "Host/cpu");

  exit(0);
}
include('rpm2.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'UOS Server' >!< os_product) audit(AUDIT_OS_NOT, 'UOS Server');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'UOS Server');
if (! preg(pattern:"^20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1070a', 'UOS Server ' + os_version);

if (!get_kb_item('Host/UOS-Server/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('aarch64' >!< cpu && 'amd64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.7', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.7', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.7', 'sp':'1070a', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!exists_check || rpm_exists(rpm:exists_check)) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}


if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'kernel');
}