cve-2023-52527
Vulnerability from cvelistv5
Published
2024-03-02 21:52
Modified
2024-08-02 23:03
Severity
Summary
ipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data()
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data()\n\nIncluding the transhdrlen in length is a problem when the packet is\npartially filled (e.g. something like send(MSG_MORE) happened previously)\nwhen appending to an IPv4 or IPv6 packet as we don\u0027t want to repeat the\ntransport header or account for it twice.  This can happen under some\ncircumstances, such as splicing into an L2TP socket.\n\nThe symptom observed is a warning in __ip6_append_data():\n\n    WARNING: CPU: 1 PID: 5042 at net/ipv6/ip6_output.c:1800 __ip6_append_data.isra.0+0x1be8/0x47f0 net/ipv6/ip6_output.c:1800\n\nthat occurs when MSG_SPLICE_PAGES is used to append more data to an already\npartially occupied skbuff.  The warning occurs when \u0027copy\u0027 is larger than\nthe amount of data in the message iterator.  This is because the requested\nlength includes the transport header length when it shouldn\u0027t.  This can be\ntriggered by, for example:\n\n        sfd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_L2TP);\n        bind(sfd, ...); // ::1\n        connect(sfd, ...); // ::1 port 7\n        send(sfd, buffer, 4100, MSG_MORE);\n        sendfile(sfd, dfd, NULL, 1024);\n\nFix this by only adding transhdrlen into the length if the write queue is\nempty in l2tp_ip6_sendmsg(), analogously to how UDP does things.\n\nl2tp_ip_sendmsg() looks like it won\u0027t suffer from this problem as it builds\nthe UDP packet itself."
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}


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