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CVE-2021-47603— audit: improve robustness of the audit queue handling

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于audit 中存在安全问题。

AI Predicted 3.3 Difficulty: Trivial EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1562.001

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 5b52330bbfe63b3305765354d6046c9f7f89c011< 75fdb751f84727d614deea0571a1490c3225d83a affected
5b52330bbfe63b3305765354d6046c9f7f89c011< 8389f50ceb854cb437fefb9330d5024ed3c7c1f5 affected
5b52330bbfe63b3305765354d6046c9f7f89c011< 0d3277eabd542fb662be23696e5ec9f390d688e1 affected
5b52330bbfe63b3305765354d6046c9f7f89c011< 4cc6badff97f74d0fce65f9784b5df3b64e4250b affected
5b52330bbfe63b3305765354d6046c9f7f89c011< a5f4d17daf2e6cd7c1d9676b476147f6b4ac53f2 affected
5b52330bbfe63b3305765354d6046c9f7f89c011< f4b3ee3c85551d2d343a3ba159304066523f730f affected
a0c48115cd2343231585f2f5e609b2ac9aa4e0af affected
4.10.7< 4.11 affected
… +8 more rows
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I. Basic Information for CVE-2021-47603

Vulnerability Information
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Vulnerability Title
audit: improve robustness of the audit queue handling
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: audit: improve robustness of the audit queue handling If the audit daemon were ever to get stuck in a stopped state the kernel's kauditd_thread() could get blocked attempting to send audit records to the userspace audit daemon. With the kernel thread blocked it is possible that the audit queue could grow unbounded as certain audit record generating events must be exempt from the queue limits else the system enter a deadlock state. This patch resolves this problem by lowering the kernel thread's socket sending timeout from MAX_SCHEDULE_TIMEOUT to HZ/10 and tweaks the kauditd_send_queue() function to better manage the various audit queues when connection problems occur between the kernel and the audit daemon. With this patch, the backlog may temporarily grow beyond the defined limits when the audit daemon is stopped and the system is under heavy audit pressure, but kauditd_thread() will continue to make progress and drain the queues as it would for other connection problems. For example, with the audit daemon put into a stopped state and the system configured to audit every syscall it was still possible to shutdown the system without a kernel panic, deadlock, etc.; granted, the system was slow to shutdown but that is to be expected given the extreme pressure of recording every syscall. The timeout value of HZ/10 was chosen primarily through experimentation and this developer's "gut feeling". There is likely no one perfect value, but as this scenario is limited in scope (root privileges would be needed to send SIGSTOP to the audit daemon), it is likely not worth exposing this as a tunable at present. This can always be done at a later date if it proves necessary.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于audit 中存在安全问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 5b52330bbfe63b3305765354d6046c9f7f89c011 ~ 75fdb751f84727d614deea0571a1490c3225d83a -
Linux Linux 4.11 -

II. Public POCs for CVE-2021-47603

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III. Intelligence Information for CVE-2021-47603

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Other References for CVE-2021-47603 (4)

Same Patch Batch · Linux · 2024-06-19 · 122 CVEs total

CVE-2024-38558 10.0 CRITICAL net: openvswitch: fix overwriting ct original tuple for ICMPv6
CVE-2024-38570 9.8 CRITICAL gfs2: Fix potential glock use-after-free on unmount
CVE-2021-47587 9.8 CRITICAL net: systemport: Add global locking for descriptor lifecycle
CVE-2024-38544 9.8 CRITICAL RDMA/rxe: Fix seg fault in rxe_comp_queue_pkt
CVE-2021-47611 8.1 HIGH mac80211: validate extended element ID is present
CVE-2024-38587 7.8 HIGH speakup: Fix sizeof() vs ARRAY_SIZE() bug
CVE-2024-38556 7.8 HIGH net/mlx5: Add a timeout to acquire the command queue semaphore
CVE-2024-38610 7.8 HIGH drivers/virt/acrn: fix PFNMAP PTE checks in acrn_vm_ram_map()
CVE-2024-38605 7.8 HIGH ALSA: core: Fix NULL module pointer assignment at card init
CVE-2024-38599 7.8 HIGH jffs2: prevent xattr node from overflowing the eraseblock
CVE-2024-38592 7.8 HIGH drm/mediatek: Init `ddp_comp` with devm_kcalloc()
CVE-2024-38564 7.8 HIGH bpf: Add BPF_PROG_TYPE_CGROUP_SKB attach type enforcement in BPF_LINK_CREATE
CVE-2024-38568 7.8 HIGH drivers/perf: hisi: hns3: Fix out-of-bound access when valid event group
CVE-2024-38572 7.8 HIGH wifi: ath12k: fix out-of-bound access of qmi_invoke_handler()
CVE-2024-38578 7.8 HIGH ecryptfs: Fix buffer size for tag 66 packet
CVE-2024-38580 7.8 HIGH epoll: be better about file lifetimes
CVE-2024-38569 7.8 HIGH drivers/perf: hisi_pcie: Fix out-of-bound access when valid event group
CVE-2024-38583 7.8 HIGH nilfs2: fix use-after-free of timer for log writer thread
CVE-2024-38614 7.8 HIGH openrisc: traps: Don't send signals to kernel mode threads
CVE-2024-38588 7.8 HIGH ftrace: Fix possible use-after-free issue in ftrace_location()

Showing top 20 of 122 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47603

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