#%NASL_MIN_LEVEL 80900 ## # (C) Tenable, Inc. ## include('compat.inc'); if (description) { script_id(273047); script_version("1.1"); script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05"); script_cve_id("CVE-2021-47250"); script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989293)"); 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-2025-989293 advisory. In the Linux kernel, the following vulnerability has been resolved: net: ipv4: fix memory leak in netlbl_cipsov4_add_std Reported by syzkaller: BUG: memory leak unreferenced object 0xffff888105df7000 (size 64): comm syz-executor842, pid 360, jiffies 4294824824 (age 22.546s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000e67ed558>] kmalloc include/linux/slab.h:590 [inline] [<00000000e67ed558>] kzalloc include/linux/slab.h:720 [inline] [<00000000e67ed558>] netlbl_cipsov4_add_std net/netlabel/netlabel_cipso_v4.c:145 [inline] [<00000000e67ed558>] netlbl_cipsov4_add+0x390/0x2340 net/netlabel/netlabel_cipso_v4.c:416 [<0000000006040154>] genl_family_rcv_msg_doit.isra.0+0x20e/0x320 net/netlink/genetlink.c:739 [<00000000204d7a1c>] genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] [<00000000204d7a1c>] genl_rcv_msg+0x2bf/0x4f0 net/netlink/genetlink.c:800 [<00000000c0d6a995>] netlink_rcv_skb+0x134/0x3d0 net/netlink/af_netlink.c:2504 [<00000000d78b9d2c>] genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 [<000000009733081b>] netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] [<000000009733081b>] netlink_unicast+0x4a0/0x6a0 net/netlink/af_netlink.c:1340 [<00000000d5fd43b8>] netlink_sendmsg+0x789/0xc70 net/netlink/af_netlink.c:1929 [<000000000a2d1e40>] sock_sendmsg_nosec net/socket.c:654 [inline] [<000000000a2d1e40>] sock_sendmsg+0x139/0x170 net/socket.c:674 [<00000000321d1969>] ____sys_sendmsg+0x658/0x7d0 net/socket.c:2350 [<00000000964e16bc>] ___sys_sendmsg+0xf8/0x170 net/socket.c:2404 [<000000001615e288>] __sys_sendmsg+0xd3/0x190 net/socket.c:2433 [<000000004ee8b6a5>] do_syscall_64+0x37/0x90 arch/x86/entry/common.c:47 [<00000000171c7cee>] entry_SYSCALL_64_after_hwframe+0x44/0xae The memory of doi_def->map.std pointing is allocated in netlbl_cipsov4_add_std, but no place has freed it. It should be freed in cipso_v4_doi_free which frees the cipso DOI resource. 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-2025-989293 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5cd27dd8"); # https://lore.kernel.org/linux-cve-announce/2024052144-CVE-2021-47250-7fad@gregkh script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c7fe27ab"); script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2021-47250"); 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-2021-47250"); 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:"2022/01/28"); script_set_attribute(attribute:"patch_publication_date", value:"2025/11/05"); script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/05"); 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) 2025 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 && 'loongarch64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu); var constraints = [ { 'release': '20', 'sp': '1070a', 'pkgs': [ {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE}, {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE}, {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE}, {'reference':'kernel-5.10.0-79.4.2', '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'); }

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