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CVE-2025-21766— ipv4: use RCU protection in __ip_rt_update_pmtu()

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__ip_rt_update_pmtu函数未使用RCU保护，可能导致释放后重用。

CVSS 8.1 · High EPSS 0.57% · P46

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux 2fbc6e89b2f1403189e624cabaf73e189c5e50c6< ce3c6165fce0f06305c806696882a3ad4b90e33f affected
2fbc6e89b2f1403189e624cabaf73e189c5e50c6< ea07480b23225942208f1b754fea1e7ec486d37e affected
2fbc6e89b2f1403189e624cabaf73e189c5e50c6< 9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4 affected
2fbc6e89b2f1403189e624cabaf73e189c5e50c6< 4583748b65dee4d61bd50a2214715b4237bc152a affected
2fbc6e89b2f1403189e624cabaf73e189c5e50c6< a39f61d212d822b3062d7f70fa0588e50e55664e affected
2fbc6e89b2f1403189e624cabaf73e189c5e50c6< 139512191bd06f1b496117c76372b2ce372c9a41 affected
f415c264176e6095e9dee823e09c5bdd0ee0d337 affected
98776a365da509ad923083ae54b38ee521c52742 affected
… +14 more rows
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I. Basic Information for CVE-2025-21766

Vulnerability Information
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Vulnerability Title
ipv4: use RCU protection in __ip_rt_update_pmtu()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: use RCU protection in __ip_rt_update_pmtu() __ip_rt_update_pmtu() must use RCU protection to make sure the net structure it reads does not disappear.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/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__ip_rt_update_pmtu函数未使用RCU保护，可能导致释放后重用。
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 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 ~ ce3c6165fce0f06305c806696882a3ad4b90e33f -
Linux Linux 5.9 -

II. Public POCs for CVE-2025-21766

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III. Intelligence Information for CVE-2025-21766

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Patches & Fixes for CVE-2025-21766 (5)

Other References for CVE-2025-21766 (1)

Same Patch Batch · Linux · 2025-02-27 · 177 CVEs total

CVE-2025-21805 9.8 CRITICAL RDMA/rtrs: Add missing deinit() call
CVE-2025-21707 9.8 CRITICAL mptcp: consolidate suboption status
CVE-2025-21748 9.8 CRITICAL ksmbd: fix integer overflows on 32 bit systems
CVE-2025-21796 9.8 CRITICAL nfsd: clear acl_access/acl_default after releasing them
CVE-2024-58006 9.6 CRITICAL PCI: dwc: ep: Prevent changing BAR size/flags in pci_epc_set_bar()
CVE-2025-21735 8.8 HIGH NFC: nci: Add bounds checking in nci_hci_create_pipe()
CVE-2024-57997 8.8 HIGH wifi: wcn36xx: fix channel survey memory allocation size
CVE-2024-57995 8.8 HIGH wifi: ath12k: fix read pointer after free in ath12k_mac_assign_vif_to_vdev()
CVE-2024-57999 8.8 HIGH powerpc/pseries/iommu: IOMMU incorrectly marks MMIO range in DDW
CVE-2025-21710 8.2 HIGH tcp: correct handling of extreme memory squeeze
CVE-2025-21762 8.1 HIGH arp: use RCU protection in arp_xmit()
CVE-2024-57973 8.1 HIGH rdma/cxgb4: Prevent potential integer overflow on 32bit
CVE-2025-21760 8.1 HIGH ndisc: extend RCU protection in ndisc_send_skb()
CVE-2025-21765 8.1 HIGH ipv6: use RCU protection in ip6_default_advmss()
CVE-2025-21730 7.8 HIGH wifi: rtw89: avoid to init mgnt_entry list twice when WoWLAN failed
CVE-2024-52560 7.8 HIGH fs/ntfs3: Mark inode as bad as soon as error detected in mi_enum_attr()
CVE-2025-21729 7.8 HIGH wifi: rtw89: fix race between cancel_hw_scan and hw_scan completion
CVE-2025-21718 7.8 HIGH net: rose: fix timer races against user threads
CVE-2025-21738 7.8 HIGH ata: libata-sff: Ensure that we cannot write outside the allocated buffer
CVE-2024-54458 7.8 HIGH scsi: ufs: bsg: Set bsg_queue to NULL after removal

Showing top 20 of 177 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21766

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