Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且供應商未提供可用的修補程式。

  - 已解決 Linux 核心中的下列弱點：perf: Fix refcount warning on event->mmap_count increment When calling refcount_inc(&event->mmap_count) inside perf_mmap_rb(), the following warning is triggered: refcount_t: addition on 0; use-after-free. WARNING: lib/refcount.c:25 PoC:
    struct perf_event_attr attr = {0}; int fd = syscall(__NR_perf_event_open, &attr, 0, -1, -1, 0); mmap(NULL, 0x3000, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); int victim = syscall(__NR_perf_event_open, &attr, 0,
    -1, fd, PERF_FLAG_FD_OUTPUT); mmap(NULL, 0x3000, PROT_READ | PROT_WRITE, MAP_SHARED, victim, 0); This occurs when creating a group member event with the flag PERF_FLAG_FD_OUTPUT. The group leader should be mmap-ed and then mmap-ing the event triggers the warning. Since the event has copied the output_event in perf_event_set_output(), event->rb is set. As a result, perf_mmap_rb() calls refcount_inc(&event->mmap_count) when event->mmap_count = 0. Disallow the case when event->mmap_count = 0.
    This also prevents two events from updating the same user_page. (CVE-2026-23127)

請注意，Nessus 依賴供應商報告的套件存在。

偵測

Linux Distros 未修補的弱點：CVE-2026-23127

medium Nessus Plugin ID 299181

版本 1.5

版本 1.4

版本 1.3

版本 1.2

版本 1.1

版本 1.5 Mar 23, 2026, 11:56 AM CVSS metrics ("CVSSv2 score" set to 4.6) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C") CVSS metrics ("CVSSv3 score" set to 5.5) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H") CVSSv3 severity (based on None, severity decreased from "High" to "Medium") Plugin Feed: 202603231156
版本 1.4 Feb 24, 2026, 6:12 AM Detection (updated detection logic) Plugin metadata Plugin Feed: 202602240612
版本 1.3 Feb 20, 2026, 4:59 PM CVSS metrics ("CVSSv2 score" set to 4.4) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P") Detection (updated detection logic) Plugin metadata Plugin Feed: 202602201659
版本 1.2 Feb 18, 2026, 9:24 AM CVSS metrics ("CVSSv2 score" set to 6.9) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C") CVSS metrics ("CVSSv3 score" set to 7.1) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H") CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:U/RL:U/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:U/RL:U/RC:C") CVSSv2 score source (set to "CVE-2026-23127") CVSSv2 severity (based on CVE-2026-23127, severity decreased from "High" to "Medium") Detection (updated detection logic) Plugin metadata Plugin Feed: 202602180924
版本 1.1 Feb 17, 2026, 12:54 AM New Plugin Feed: 202602170054