In the Linux kernel, the following vulnerability has been resolved: powerpc/64s: Fix crashes when toggling entry flush barrier The entry flush mitigation can be enabled/disabled at runtime via a debugfs file (entry_flush), which causes the kernel to patch itself to enable/disable the relevant mitigations. However depending on which mitigation we're using, it may not be safe to do that patching while other CPUs are active. For example the following crash: sleeper[15639]: segfault (11) at c000000000004c20 nip c000000000004c20 lr c000000000004c20 Shows that we returned to userspace with a corrupted LR that points into the kernel, due to executing the partially patched call to the fallback entry flush (ie. we missed the LR restore). Fix it by doing the patching under stop machine. The CPUs that aren't doing the patching will be spinning in the core of the stop machine logic. That is currently sufficient for our purposes, because none of the patching we do is to that code or anywhere in the vicinity.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6739-1 advisory.

  - In the Linux kernel, the following vulnerability has been resolved: i2c: Fix a potential use after free     Free the adap structure only after we are done using it. This patch just moves the put_device() down a bit     to avoid the use after free. [wsa: added comment to the code, added Fixes tag] (CVE-2019-25162)

  - In the Linux kernel, the following vulnerability has been resolved: net: fix use-after-free in     tw_timer_handler A real world panic issue was found as follow in Linux 5.4. BUG: unable to handle page     fault for address: ffffde49a863de28 PGD 7e6fe62067 P4D 7e6fe62067 PUD 7e6fe63067 PMD f51e064067 PTE 0 RIP:
    0010:tw_timer_handler+0x20/0x40 Call Trace: <IRQ> call_timer_fn+0x2b/0x120 run_timer_softirq+0x1ef/0x450
    __do_softirq+0x10d/0x2b8 irq_exit+0xc7/0xd0 smp_apic_timer_interrupt+0x68/0x120     apic_timer_interrupt+0xf/0x20 This issue was also reported since 2017 in the thread [1], unfortunately,     the issue was still can be reproduced after fixing DCCP. The ipv4_mib_exit_net is called before     tcp_sk_exit_batch when a net namespace is destroyed since tcp_sk_ops is registered befrore ipv4_mib_ops,     which means tcp_sk_ops is in the front of ipv4_mib_ops in the list of pernet_list. There will be a use-     after-free on net->mib.net_statistics in tw_timer_handler after ipv4_mib_exit_net if there are some     inflight time-wait timers. This bug is not introduced by commit f2bf415cfed7 (mib: add net to     NET_ADD_STATS_BH) since the net_statistics is a global variable instead of dynamic allocation and     freeing. Actually, commit 61a7e26028b9 (mib: put net statistics on struct net) introduces the bug since     it put net statistics on struct net and free it when net namespace is destroyed. Moving init_ipv4_mibs()     to the front of tcp_init() to fix this bug and replace pr_crit() with panic() since continuing is     meaningless when init_ipv4_mibs() fails. [1] https://groups.google.com/g/syzkaller/c/p1tn-
    _Kc6l4/m/smuL_FMAAgAJ?pli=1 (CVE-2021-46936)

  - In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix stack OOB read while     fragmenting IPv4 packets running openvswitch on kernels built with KASAN, it's possible to see the     following splat while testing fragmentation of IPv4 packets: BUG: KASAN: stack-out-of-bounds in     ip_do_fragment+0x1b03/0x1f60 Read of size 1 at addr ffff888112fc713c by task handler2/1367 CPU: 0 PID:
    1367 Comm: handler2 Not tainted 5.12.0-rc6+ #418 Hardware name: Red Hat KVM, BIOS     1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014 Call Trace: dump_stack+0x92/0xc1     print_address_description.constprop.7+0x1a/0x150 kasan_report.cold.13+0x7f/0x111     ip_do_fragment+0x1b03/0x1f60 ovs_fragment+0x5bf/0x840 [openvswitch] do_execute_actions+0x1bd5/0x2400     [openvswitch] ovs_execute_actions+0xc8/0x3d0 [openvswitch] ovs_packet_cmd_execute+0xa39/0x1150     [openvswitch] genl_family_rcv_msg_doit.isra.15+0x227/0x2d0 genl_rcv_msg+0x287/0x490     netlink_rcv_skb+0x120/0x380 genl_rcv+0x24/0x40 netlink_unicast+0x439/0x630 netlink_sendmsg+0x719/0xbf0     sock_sendmsg+0xe2/0x110 ____sys_sendmsg+0x5ba/0x890 ___sys_sendmsg+0xe9/0x160 __sys_sendmsg+0xd3/0x170     do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f957079db07 Code: c3 66 90     41 54 41 89 d4 55 48 89 f5 53 89 fb 48 83 ec 10 e8 eb ec ff ff 44 89 e2 48 89 ee 89 df 41 89 c0 b8 2e 00     00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 48 89 44 24 08 e8 24 ed ff ff 48 RSP: 002b:00007f956ce35a50     EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000019 RCX:
    00007f957079db07 RDX: 0000000000000000 RSI: 00007f956ce35ae0 RDI: 0000000000000019 RBP: 00007f956ce35ae0     R08: 0000000000000000 R09: 00007f9558006730 R10: 0000000000000000 R11: 0000000000000293 R12:
    0000000000000000 R13: 00007f956ce37308 R14: 00007f956ce35f80 R15: 00007f956ce35ae0 The buggy address     belongs to the page: page:00000000af2a1d93 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0     pfn:0x112fc7 flags: 0x17ffffc0000000() raw: 0017ffffc0000000 0000000000000000 dead000000000122     0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped     because: kasan: bad access detected addr ffff888112fc713c is located in stack of task handler2/1367 at     offset 180 in frame: ovs_fragment+0x0/0x840 [openvswitch] this frame has 2 objects: [32, 144) 'ovs_dst'     [192, 424) 'ovs_rt' Memory state around the buggy address: ffff888112fc7000: f3 00 00 00 00 00 00 00 00 00     00 00 00 00 00 00 ffff888112fc7080: 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00 >ffff888112fc7100: 00     00 00 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 ^ ffff888112fc7180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00     00 00 ffff888112fc7200: 00 00 00 00 00 00 f2 f2 f2 00 00 00 00 00 00 00 for IPv4 packets, ovs_fragment()     uses a temporary struct dst_entry. Then, in the following call graph: ip_do_fragment() ip_skb_dst_mtu()     ip_dst_mtu_maybe_forward() ip_mtu_locked() the pointer to struct dst_entry is used as pointer to struct     rtable: this turns the access to struct members like rt_mtu_locked into an OOB read in the stack. Fix this     changing the temporary variable used for IPv4 packets in ovs_fragment(), similarly to what is done for     IPv6 few lines below. (CVE-2021-46955)

  - In the Linux kernel, the following vulnerability has been resolved: ACPI: custom_method: fix potential     use-after-free issue In cm_write(), buf is always freed when reaching the end of the function. If the     requested count is less than table.length, the allocated buffer will be freed but subsequent calls to     cm_write() will still try to access it. Remove the unconditional kfree(buf) at the end of the function and     set the buf to NULL in the -EINVAL error path to match the rest of function. (CVE-2021-46966)

  - In the Linux kernel, the following vulnerability has been resolved: powerpc/64s: Fix crashes when toggling     entry flush barrier The entry flush mitigation can be enabled/disabled at runtime via a debugfs file     (entry_flush), which causes the kernel to patch itself to enable/disable the relevant mitigations. However     depending on which mitigation we're using, it may not be safe to do that patching while other CPUs are     active. For example the following crash: sleeper[15639]: segfault (11) at c000000000004c20 nip     c000000000004c20 lr c000000000004c20 Shows that we returned to userspace with a corrupted LR that points     into the kernel, due to executing the partially patched call to the fallback entry flush (ie. we missed     the LR restore). Fix it by doing the patching under stop machine. The CPUs that aren't doing the patching     will be spinning in the core of the stop machine logic. That is currently sufficient for our purposes,     because none of the patching we do is to that code or anywhere in the vicinity. (CVE-2021-46990)

  - In emulation_proc_handler of armv8_deprecated.c, there is a possible way to corrupt memory due to a race     condition. This could lead to local escalation of privilege with no additional execution privileges     needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid     ID: A-237540956References: Upstream kernel (CVE-2022-20422)

  - A data race flaw was found in the Linux kernel, between where con is allocated and con->sock is set. This     issue leads to a NULL pointer dereference when accessing con->sock->sk in net/tipc/topsrv.c in the tipc     protocol in the Linux kernel. (CVE-2023-1382)

  - The Linux kernel allows userspace processes to enable mitigations by calling prctl with     PR_SET_SPECULATION_CTRL which disables the speculation feature as well as by using seccomp. We had noticed     that on VMs of at least one major cloud provider, the kernel still left the victim process exposed to     attacks in some cases even after enabling the spectre-BTI mitigation with prctl. The same behavior can be     observed on a bare-metal machine when forcing the mitigation to IBRS on boot command line. This happened     because when plain IBRS was enabled (not enhanced IBRS), the kernel had some logic that determined that     STIBP was not needed. The IBRS bit implicitly protects against cross-thread branch target injection.
    However, with legacy IBRS, the IBRS bit was cleared on returning to userspace, due to performance reasons,     which disabled the implicit STIBP and left userspace threads vulnerable to cross-thread branch target     injection against which STIBP protects. (CVE-2023-1998)

  - Bluetooth BR/EDR devices with Secure Simple Pairing and Secure Connections pairing in Bluetooth Core     Specification 4.2 through 5.4 allow certain man-in-the-middle attacks that force a short key length, and     might lead to discovery of the encryption key and live injection, aka BLUFFS. (CVE-2023-24023)

  - In the Linux kernel before 6.4.5, drivers/gpu/drm/drm_atomic.c has a use-after-free during a race     condition between a nonblocking atomic commit and a driver unload. (CVE-2023-51043)

  - bt_sock_recvmsg in net/bluetooth/af_bluetooth.c in the Linux kernel through 6.6.8 has a use-after-free     because of a bt_sock_ioctl race condition. (CVE-2023-51779)

  - dm_table_create in drivers/md/dm-table.c in the Linux kernel through 6.7.4 can attempt to (in     alloc_targets) allocate more than INT_MAX bytes, and crash, because of a missing check for struct     dm_ioctl.target_count. (CVE-2023-52429)

  - In the Linux kernel, the following vulnerability has been resolved: media: pvrusb2: fix use after free on     context disconnection Upon module load, a kthread is created targeting the pvr2_context_thread_func     function, which may call pvr2_context_destroy and thus call kfree() on the context object. However, that     might happen before the usb hub_event handler is able to notify the driver. This patch adds a sanity check     before the invalid read reported by syzbot, within the context disconnection call stack. (CVE-2023-52445)

  - In the Linux kernel, the following vulnerability has been resolved: powerpc/pseries/memhp: Fix access     beyond end of drmem array dlpar_memory_remove_by_index() may access beyond the bounds of the drmem lmb     array when the LMB lookup fails to match an entry with the given DRC index. When the search fails, the     cursor is left pointing to &drmem_info->lmbs[drmem_info->n_lmbs], which is one element past the last valid     entry in the array. The debug message at the end of the function then dereferences this pointer:
    pr_debug(Failed to hot-remove memory at %llx\n, lmb->base_addr); This was found by inspection and     confirmed with KASAN: pseries-hotplug-mem: Attempting to hot-remove LMB, drc index 1234     ================================================================== BUG: KASAN: slab-out-of-bounds in     dlpar_memory+0x298/0x1658 Read of size 8 at addr c000000364e97fd0 by task bash/949     dump_stack_lvl+0xa4/0xfc (unreliable) print_report+0x214/0x63c kasan_report+0x140/0x2e0
    __asan_load8+0xa8/0xe0 dlpar_memory+0x298/0x1658 handle_dlpar_errorlog+0x130/0x1d0 dlpar_store+0x18c/0x3e0     kobj_attr_store+0x68/0xa0 sysfs_kf_write+0xc4/0x110 kernfs_fop_write_iter+0x26c/0x390     vfs_write+0x2d4/0x4e0 ksys_write+0xac/0x1a0 system_call_exception+0x268/0x530     system_call_vectored_common+0x15c/0x2ec Allocated by task 1: kasan_save_stack+0x48/0x80     kasan_set_track+0x34/0x50 kasan_save_alloc_info+0x34/0x50 __kasan_kmalloc+0xd0/0x120 __kmalloc+0x8c/0x320     kmalloc_array.constprop.0+0x48/0x5c drmem_init+0x2a0/0x41c do_one_initcall+0xe0/0x5c0     kernel_init_freeable+0x4ec/0x5a0 kernel_init+0x30/0x1e0 ret_from_kernel_user_thread+0x14/0x1c The buggy     address belongs to the object at c000000364e80000 which belongs to the cache kmalloc-128k of size 131072     The buggy address is located 0 bytes to the right of allocated 98256-byte region [c000000364e80000,     c000000364e97fd0) ================================================================== pseries-hotplug-mem:
    Failed to hot-remove memory at 0 Log failed lookups with a separate message and dereference the cursor     only when it points to a valid entry. (CVE-2023-52451)

  - In the Linux kernel, the following vulnerability has been resolved: jfs: fix uaf in jfs_evict_inode When     the execution of diMount(ipimap) fails, the object ipimap that has been released may be accessed in     diFreeSpecial(). Asynchronous ipimap release occurs when rcu_core() calls jfs_free_node(). Therefore, when     diMount(ipimap) fails, sbi->ipimap should not be initialized as ipimap. (CVE-2023-52600)

  - In the Linux kernel, the following vulnerability has been resolved: UBSAN: array-index-out-of-bounds in     dtSplitRoot Syzkaller reported the following issue: oop0: detected capacity change from 0 to 32768 UBSAN:
    array-index-out-of-bounds in fs/jfs/jfs_dtree.c:1971:9 index -2 is out of range for type 'struct dtslot     [128]' CPU: 0 PID: 3613 Comm: syz-executor270 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0 Hardware     name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: <TASK>
    __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 ubsan_epilogue     lib/ubsan.c:151 [inline] __ubsan_handle_out_of_bounds+0xdb/0x130 lib/ubsan.c:283 dtSplitRoot+0x8d8/0x1900     fs/jfs/jfs_dtree.c:1971 dtSplitUp fs/jfs/jfs_dtree.c:985 [inline] dtInsert+0x1189/0x6b80     fs/jfs/jfs_dtree.c:863 jfs_mkdir+0x757/0xb00 fs/jfs/namei.c:270 vfs_mkdir+0x3b3/0x590 fs/namei.c:4013     do_mkdirat+0x279/0x550 fs/namei.c:4038 __do_sys_mkdirat fs/namei.c:4053 [inline] __se_sys_mkdirat     fs/namei.c:4051 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4051 do_syscall_x64     arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80     entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fcdc0113fd9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00     00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0     ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeb8bc67d8 EFLAGS: 00000246     ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcdc0113fd9 RDX:
    0000000000000000 RSI: 0000000020000340 RDI: 0000000000000003 RBP: 00007fcdc00d37a0 R08: 0000000000000000     R09: 00007fcdc00d37a0 R10: 00005555559a72c0 R11: 0000000000000246 R12: 00000000f8008000 R13:
    0000000000000000 R14: 00083878000000f8 R15: 0000000000000000 </TASK> The issue is caused when the value of     fsi becomes less than -1. The check to break the loop when fsi value becomes -1 is present but syzbot was     able to produce value less than -1 which cause the error. This patch simply add the change for the values     less than 0. The patch is tested via syzbot. (CVE-2023-52603)

  - copy_params in drivers/md/dm-ioctl.c in the Linux kernel through 6.7.1 can attempt to allocate more than     INT_MAX bytes, and crash, because of a missing param_kernel->data_size check. This is related to     ctl_ioctl. (CVE-2024-23851)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
198237	SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2024:1870-1)	Nessus	SuSE Local Security Checks	high
197057	SUSE SLES12 Security Update : kernel (SUSE-SU-2024:1646-1)	Nessus	SuSE Local Security Checks	high
197055	SUSE SLES12 Security Update : kernel (SUSE-SU-2024:1643-1)	Nessus	SuSE Local Security Checks	high
197048	SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2024:1648-1)	Nessus	SuSE Local Security Checks	high
194454	SUSE SLES15 Security Update : kernel (SUSE-SU-2024:1454-1)	Nessus	SuSE Local Security Checks	high
193594	Ubuntu 14.04 LTS / 16.04 LTS : Linux kernel vulnerabilities (USN-6739-1)	Nessus	Ubuntu Local Security Checks	high

Detections

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CVE-2021-46990

medium

Tenable Plugins

high

high

high

high

high

high