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CVE-2024-45020— bpf: Fix a kernel verifier crash in stacksafe()

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bpf组件存在内核验证器崩溃问题。

CVSS 7.8 · High EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 9

VendorProduct Version RangeStatus
Linux Linux ab470fefce2837e66b771c60858118d50bb5bb10< 7cad3174cc79519bf5f6c4441780264416822c08 affected
2793a8b015f7f1caadb9bce9c63dc659f7522676< 6e3987ac310c74bb4dd6a2fa8e46702fe505fb2b affected
2793a8b015f7f1caadb9bce9c63dc659f7522676< bed2eb964c70b780fb55925892a74f26cb590b25 affected
6.6.15< 6.6.48 affected
6.7 affected
< 6.7 unaffected
6.6.48≤ 6.6.* unaffected
6.10.7≤ 6.10.* unaffected
… +1 more rows
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I. Basic Information for CVE-2024-45020

Vulnerability Information
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Vulnerability Title
bpf: Fix a kernel verifier crash in stacksafe()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a kernel verifier crash in stacksafe() Daniel Hodges reported a kernel verifier crash when playing with sched-ext. Further investigation shows that the crash is due to invalid memory access in stacksafe(). More specifically, it is the following code: if (exact != NOT_EXACT && old->stack[spi].slot_type[i % BPF_REG_SIZE] != cur->stack[spi].slot_type[i % BPF_REG_SIZE]) return false; The 'i' iterates old->allocated_stack. If cur->allocated_stack < old->allocated_stack the out-of-bound access will happen. To fix the issue add 'i >= cur->allocated_stack' check such that if the condition is true, stacksafe() should fail. Otherwise, cur->stack[spi].slot_type[i % BPF_REG_SIZE] memory access is legal.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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bpf组件存在内核验证器崩溃问题。
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 ab470fefce2837e66b771c60858118d50bb5bb10 ~ 7cad3174cc79519bf5f6c4441780264416822c08 -
Linux Linux 6.7 -

II. Public POCs for CVE-2024-45020

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III. Intelligence Information for CVE-2024-45020

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Patches & Fixes for CVE-2024-45020 (1)

Same Patch Batch · Linux · 2024-09-11 · 23 CVEs total

CVE-2024-45030 9.8 CRITICAL igb: cope with large MAX_SKB_FRAGS
CVE-2024-45013 9.8 CRITICAL nvme: move stopping keep-alive into nvme_uninit_ctrl()
CVE-2024-45009 8.2 HIGH mptcp: pm: only decrement add_addr_accepted for MPJ req
CVE-2024-45019 7.8 HIGH net/mlx5e: Take state lock during tx timeout reporter
CVE-2024-45016 7.8 HIGH netem: fix return value if duplicate enqueue fails
CVE-2024-45017 7.8 HIGH net/mlx5: Fix IPsec RoCE MPV trace call
CVE-2024-45023 7.8 HIGH md/raid1: Fix data corruption for degraded array with slow disk
CVE-2024-45022 7.8 HIGH mm/vmalloc: fix page mapping if vm_area_alloc_pages() with high order fallback to order 0
CVE-2024-45024 7.8 HIGH mm/hugetlb: fix hugetlb vs. core-mm PT locking
CVE-2024-45021 7.1 HIGH memcg_write_event_control(): fix a user-triggerable oops
CVE-2024-45026 7.0 HIGH s390/dasd: fix error recovery leading to data corruption on ESE devices
CVE-2024-46672 wifi: brcmfmac: cfg80211: Handle SSID based pmksa deletion
CVE-2024-45025 fix bitmap corruption on close_range() with CLOSE_RANGE_UNSHARE
CVE-2024-45018 netfilter: flowtable: initialise extack before use
CVE-2024-45027 usb: xhci: Check for xhci->interrupters being allocated in xhci_mem_clearup()
CVE-2024-45014 s390/boot: Avoid possible physmem_info segment corruption
CVE-2024-45015 drm/msm/dpu: move dpu_encoder's connector assignment to atomic_enable()
CVE-2024-45012 nouveau/firmware: use dma non-coherent allocator
CVE-2024-45029 i2c: tegra: Do not mark ACPI devices as irq safe
CVE-2024-45011 char: xillybus: Check USB endpoints when probing device

Showing top 20 of 23 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-45020

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