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CVE-2024-50253— bpf: Check the validity of nr_words in bpf_iter_bits_new()

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_iter_bits_new函数中nr_words有效性检查存在问题。

CVSS 7.8 · High EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1408.002

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 4665415975b0827e9646cab91c61d02a6b364d59< c9539e09c67880ecd88b51188c346a2cc078b06c affected
4665415975b0827e9646cab91c61d02a6b364d59< 393397fbdcad7396639d7077c33f86169184ba99 affected
6.11 affected
< 6.11 unaffected
6.11.7≤ 6.11.* unaffected
6.12≤ * unaffected
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I. Basic Information for CVE-2024-50253

Vulnerability Information
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Vulnerability Title
bpf: Check the validity of nr_words in bpf_iter_bits_new()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Check the validity of nr_words in bpf_iter_bits_new() Check the validity of nr_words in bpf_iter_bits_new(). Without this check, when multiplication overflow occurs for nr_bits (e.g., when nr_words = 0x0400-0001, nr_bits becomes 64), stack corruption may occur due to bpf_probe_read_kernel_common(..., nr_bytes = 0x2000-0008). Fix it by limiting the maximum value of nr_words to 511. The value is derived from the current implementation of BPF memory allocator. To ensure compatibility if the BPF memory allocator's size limitation changes in the future, use the helper bpf_mem_alloc_check_size() to check whether nr_bytes is too larger. And return -E2BIG instead of -ENOMEM for oversized nr_bytes.
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_iter_bits_new函数中nr_words有效性检查存在问题。
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 4665415975b0827e9646cab91c61d02a6b364d59 ~ c9539e09c67880ecd88b51188c346a2cc078b06c -
Linux Linux 6.11 -

II. Public POCs for CVE-2024-50253

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III. Intelligence Information for CVE-2024-50253

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Patches & Fixes for CVE-2024-50253 (1)

Same Patch Batch · Linux · 2024-11-09 · 49 CVEs total

CVE-2024-50215 8.1 HIGH nvmet-auth: assign dh_key to NULL after kfree_sensitive
CVE-2024-50262 7.8 HIGH bpf: Fix out-of-bounds write in trie_get_next_key()
CVE-2024-50246 7.8 HIGH fs/ntfs3: Add rough attr alloc_size check
CVE-2024-50237 7.8 HIGH wifi: mac80211: do not pass a stopped vif to the driver in .get_txpower
CVE-2024-50225 7.8 HIGH btrfs: fix error propagation of split bios
CVE-2024-50230 7.8 HIGH nilfs2: fix kernel bug due to missing clearing of checked flag
CVE-2024-50221 7.8 HIGH drm/amd/pm: Vangogh: Fix kernel memory out of bounds write
CVE-2024-50250 7.8 HIGH fsdax: dax_unshare_iter needs to copy entire blocks
CVE-2024-50217 7.8 HIGH btrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()
CVE-2024-50235 7.8 HIGH wifi: cfg80211: clear wdev->cqm_config pointer on free
CVE-2024-50261 7.8 HIGH macsec: Fix use-after-free while sending the offloading packet
CVE-2024-50241 7.5 HIGH NFSD: Initialize struct nfsd4_copy earlier
CVE-2024-50256 7.5 HIGH netfilter: nf_reject_ipv6: fix potential crash in nf_send_reset6()
CVE-2024-50247 7.3 HIGH fs/ntfs3: Check if more than chunk-size bytes are written
CVE-2024-50248 7.1 HIGH ntfs3: Add bounds checking to mi_enum_attr()
CVE-2024-50257 7.0 HIGH netfilter: Fix use-after-free in get_info()
CVE-2024-50222 7.0 HIGH iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP
CVE-2024-50243 fs/ntfs3: Fix general protection fault in run_is_mapped_full
CVE-2024-50244 fs/ntfs3: Additional check in ni_clear()
CVE-2024-50238 phy: qcom: qmp-usbc: fix NULL-deref on runtime suspend

Showing top 20 of 49 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-50253

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