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CVE-2024-50212— lib: alloc_tag_module_unload must wait for pending kfree_rcu calls

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，该漏洞源于存在alloc_tag_module_unload时kfree_rcu调用等待问题。

AI Predicted 5.3 Difficulty: Hard EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux a473573964e51dcb6efc182f773cd3924be4a184< 24211fb49c9ac1b576470b7e393a5a0b50af2707 affected
a473573964e51dcb6efc182f773cd3924be4a184< dc783ba4b9df3fb3e76e968b2cbeb9960069263c affected
6.10 affected
< 6.10 unaffected
6.11.7≤ 6.11.* unaffected
6.12≤ * unaffected
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I. Basic Information for CVE-2024-50212

Vulnerability Information
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Vulnerability Title
lib: alloc_tag_module_unload must wait for pending kfree_rcu calls
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: lib: alloc_tag_module_unload must wait for pending kfree_rcu calls Ben Greear reports following splat: ------------[ cut here ]------------ net/netfilter/nf_nat_core.c:1114 module nf_nat func:nf_nat_register_fn has 256 allocated at module unload WARNING: CPU: 1 PID: 10421 at lib/alloc_tag.c:168 alloc_tag_module_unload+0x22b/0x3f0 Modules linked in: nf_nat(-) btrfs ufs qnx4 hfsplus hfs minix vfat msdos fat ... Hardware name: Default string Default string/SKYBAY, BIOS 5.12 08/04/2020 RIP: 0010:alloc_tag_module_unload+0x22b/0x3f0 codetag_unload_module+0x19b/0x2a0 ? codetag_load_module+0x80/0x80 nf_nat module exit calls kfree_rcu on those addresses, but the free operation is likely still pending by the time alloc_tag checks for leaks. Wait for outstanding kfree_rcu operations to complete before checking resolves this warning. Reproducer: unshare -n iptables-nft -t nat -A PREROUTING -p tcp grep nf_nat /proc/allocinfo # will list 4 allocations rmmod nft_chain_nat rmmod nf_nat # will WARN. [akpm@linux-foundation.org: add comment]
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，该漏洞源于存在alloc_tag_module_unload时kfree_rcu调用等待问题。
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 a473573964e51dcb6efc182f773cd3924be4a184 ~ 24211fb49c9ac1b576470b7e393a5a0b50af2707 -
Linux Linux 6.10 -

II. Public POCs for CVE-2024-50212

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III. Intelligence Information for CVE-2024-50212

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Patches & Fixes for CVE-2024-50212 (2)

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-2024-50225 7.8 HIGH btrfs: fix error propagation of split bios
CVE-2024-50261 7.8 HIGH macsec: Fix use-after-free while sending the offloading packet
CVE-2024-50221 7.8 HIGH drm/amd/pm: Vangogh: Fix kernel memory out of bounds write
CVE-2024-50262 7.8 HIGH bpf: Fix out-of-bounds write in trie_get_next_key()
CVE-2024-50217 7.8 HIGH btrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()
CVE-2024-50246 7.8 HIGH fs/ntfs3: Add rough attr alloc_size check
CVE-2024-50230 7.8 HIGH nilfs2: fix kernel bug due to missing clearing of checked flag
CVE-2024-50253 7.8 HIGH bpf: Check the validity of nr_words in bpf_iter_bits_new()
CVE-2024-50237 7.8 HIGH wifi: mac80211: do not pass a stopped vif to the driver in .get_txpower
CVE-2024-50250 7.8 HIGH fsdax: dax_unshare_iter needs to copy entire blocks
CVE-2024-50235 7.8 HIGH wifi: cfg80211: clear wdev->cqm_config pointer on free
CVE-2024-50256 7.5 HIGH netfilter: nf_reject_ipv6: fix potential crash in nf_send_reset6()
CVE-2024-50241 7.5 HIGH NFSD: Initialize struct nfsd4_copy earlier
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-2024-50245 fs/ntfs3: Fix possible deadlock in mi_read
CVE-2024-50239 phy: qcom: qmp-usb-legacy: 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-2024-50212

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