CentOS Linux 6 [TuxCare] 安全更新：kernel / kernel-abi-whitelists / kernel-debug / kernel-debug-devel / 等多个漏洞 （CENTOS6：CLSA-2026：1787292891）
critical Nessus 插件 ID 360321
语言：
简介
CentOS Linux 主机缺少一个或多个安全更新。描述
CentOS Linux 6 主机上存在安装的程序包，该程序包受到 TuxCare CENTOS6：CLSA-2026：2026：1787292891公告中提及的多个漏洞的影响。- 已修复 Linux 内核中的下列漏洞：NFSv4: include MAY_WRITE in open permission mask for O_TRUNC POSIX requires write permission to truncate a file, so an open() that specifies O_TRUNC must be authorized for write access regardless of the O_ACCMODE access mode.
nfs_open_permission_mask() builds the access mask passed to nfs_may_open(), which is the local authorization gate for OPENs the client serves itself from a cached write delegation via the can_open_delegated() path in nfs4_try_open_cached(). The mask is derived from O_ACCMODE alone, so an open(O_RDONLY | O_TRUNC) against a file the caller cannot write requests only MAY_READ and passes the local check. The OPEN is then satisfied locally and the truncation is issued to the server as a SETATTR(size=0) over the delegation stateid, which the server accepts under standard write-delegation semantics. POSIX requires that this open fail with EACCES. Include MAY_WRITE in the mask whenever O_TRUNC is set so the local check matches the access the server would have enforced. (CVE-2026-64298)
- 已修复 Linux 内核中的下列漏洞：sctp: don't free the ASCONF's own transport in DEL-IP processing sctp_process_asconf() caches the transport the ASCONF chunk is processed against in asconf->transport (== chunk->transport, set once in sctp_rcv()). For an ASCONF located through its Address Parameter by __sctp_rcv_asconf_lookup(), that cached transport corresponds to the Address Parameter, which need not be the packet's source address. sctp_process_asconf_param() rejects a DEL-IP for the packet source address (ADDIP D8, SCTP_ERROR_DEL_SRC_IP), but nothing protects asconf->transport. A single ASCONF can therefore carry, in order: [Address Parameter L] [DEL-IP L] [DEL-IP 0.0.0.0] where L differs from the source. The DEL-IP for L passes the D8 check and calls sctp_assoc_rm_peer() on the transport that asconf->transport still points at, freeing it (RCU-deferred). The following wildcard DEL-IP then reuses the now-dangling asconf->transport in sctp_assoc_set_primary() and sctp_assoc_del_nonprimary_peers(): set_primary() dereferences the freed transport (->ipaddr, ->state) and plants the dangling pointer into asoc->peer.primary_path / active_path, and del_nonprimary_peers(), keeping only the pointer that is no longer on the list, removes every real transport, leaving the association with a transport_count of 0 and primary_path/active_path pointing at freed memory. Reject a DEL-IP that targets the transport the ASCONF is being processed against, mirroring the existing source-address guard, so the wildcard branch can never reuse a freed transport. (CVE-2026-64564)
请注意，Nessus 尚未测试这些问题，而是只依据应用程序自我报告的版本号进行判断。
解决方案
根据 TuxCare 公告 CENTOS6：CLSA-2026：1787292891 中的指南更新受影响的程序包。另见
插件详情
严重性: Critical
ID: 360321
文件名: tuxcare_centos_6_CLSA-2026-1787292891.nasl
版本: 1.1
类型: Local
代理: unix
发布时间: 2026/10/1
最近更新时间: 2026/10/1
支持的传感器: Continuous Assessment, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
风险信息
VPR
风险因素: High
分数: 7.9
百分位: 99.36
Vendor
Vendor Severity: Important
CVSS v2
风险因素: Critical
基本分数: 10
时间分数: 7.8
矢量: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS 分数来源: CVE-2026-64564
CVSS v3
风险因素: Critical
基本分数: 9.8
时间分数: 8.8
矢量: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
时间矢量: CVSS:3.0/E:P/RL:O/RC:C
漏洞信息
必需的 KB 项: Host/OS/extended-third-party, Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list
可利用: true
易利用性: Exploits are available
补丁发布日期: 2026/8/21
漏洞发布日期: 2026/7/23
参考资料信息
CVE: CVE-2026-64298, CVE-2026-64564
CLSA: 2026:1787292891