The version of kernel installed on the remote host is prior to 4.14.238-125.421. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2021-1516 advisory.

  - An issue was discovered in the Linux kernel before 5.11.11. The netfilter subsystem allows attackers to     cause a denial of service (panic) because net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h     lack a full memory barrier upon the assignment of a new table value, aka CID-175e476b8cdf.
    (CVE-2021-29650)

  - kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect limits for pointer arithmetic     operations, aka CID-bb01a1bba579. This can be abused to perform out-of-bounds reads and writes in kernel     memory, leading to local privilege escalation to root. In particular, there is a corner case where the off     reg causes a masking direction change, which then results in an incorrect final aux->alu_limit.
    (CVE-2021-33200)

  - In the Linux kernel, the following vulnerability has been resolved: dm rq: fix double free of     blk_mq_tag_set in dev remove after table load fails When loading a device-mapper table for a request-based     mapped device, and the allocation/initialization of the blk_mq_tag_set for the device fails, a following     device remove will cause a double free. E.g. (dmesg): device-mapper: core: Cannot initialize queue for     request-based dm-mq mapped device device-mapper: ioctl: unable to set up device queue for new table.
    Unable to handle kernel pointer dereference in virtual kernel address space Failing address:
    0305e098835de000 TEID: 0305e098835de803 Fault in home space mode while using kernel ASCE.
    AS:000000025efe0007 R3:0000000000000024 Oops: 0038 ilc:3 [#1] SMP Modules linked in: ... lots of modules     ... Supported: Yes, External CPU: 0 PID: 7348 Comm: multipathd Kdump: loaded Tainted: G W X     5.3.18-53-default #1 SLE15-SP3 Hardware name: IBM 8561 T01 7I2 (LPAR) Krnl PSW : 0704e00180000000     000000025e368eca (kfree+0x42/0x330) R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3 Krnl     GPRS: 000000000000004a 000000025efe5230 c1773200d779968d 0000000000000000 000000025e520270     000000025e8d1b40 0000000000000003 00000007aae10000 000000025e5202a2 0000000000000001 c1773200d779968d     0305e098835de640 00000007a8170000 000003ff80138650 000000025e5202a2 000003e00396faa8 Krnl Code:
    000000025e368eb8: c4180041e100 lgrl %r1,25eba50b8 000000025e368ebe: ecba06b93a55 risbg %r11,%r10,6,185,58     #000000025e368ec4: e3b010000008 ag %r11,0(%r1) >000000025e368eca: e310b0080004 lg %r1,8(%r11)     000000025e368ed0: a7110001 tmll %r1,1 000000025e368ed4: a7740129 brc 7,25e369126 000000025e368ed8:
    e320b0080004 lg %r2,8(%r11) 000000025e368ede: b904001b lgr %r1,%r11 Call Trace: [<000000025e368eca>]     kfree+0x42/0x330 [<000000025e5202a2>] blk_mq_free_tag_set+0x72/0xb8 [<000003ff801316a8>]     dm_mq_cleanup_mapped_device+0x38/0x50 [dm_mod] [<000003ff80120082>] free_dev+0x52/0xd0 [dm_mod]     [<000003ff801233f0>] __dm_destroy+0x150/0x1d0 [dm_mod] [<000003ff8012bb9a>] dev_remove+0x162/0x1c0     [dm_mod] [<000003ff8012a988>] ctl_ioctl+0x198/0x478 [dm_mod] [<000003ff8012ac8a>] dm_ctl_ioctl+0x22/0x38     [dm_mod] [<000000025e3b11ee>] ksys_ioctl+0xbe/0xe0 [<000000025e3b127a>] __s390x_sys_ioctl+0x2a/0x40     [<000000025e8c15ac>] system_call+0xd8/0x2c8 Last Breaking-Event-Address: [<000000025e52029c>]     blk_mq_free_tag_set+0x6c/0xb8 Kernel panic - not syncing: Fatal exception: panic_on_oops When     allocation/initialization of the blk_mq_tag_set fails in dm_mq_init_request_queue(), it is     uninitialized/freed, but the pointer is not reset to NULL; so when dev_remove() later gets into     dm_mq_cleanup_mapped_device() it sees the pointer and tries to uninitialize and free it again. Fix this by     setting the pointer to NULL in dm_mq_init_request_queue() error-handling. Also set it to NULL in     dm_mq_cleanup_mapped_device(). (CVE-2021-46938)

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

Detections

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Amazon Linux AMI : kernel (ALAS-2021-1516)

high Nessus Plugin ID 151521

Version 1.3