{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-46955","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-27T18:42:55.937Z","datePublished":"2024-02-27T18:46:57.428Z","dateUpdated":"2025-05-04T12:40:36.828Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T12:40:36.828Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: fix stack OOB read while fragmenting IPv4 packets\n\nrunning openvswitch on kernels built with KASAN, it's possible to see the\nfollowing splat while testing fragmentation of IPv4 packets:\n\n BUG: KASAN: stack-out-of-bounds in ip_do_fragment+0x1b03/0x1f60\n Read of size 1 at addr ffff888112fc713c by task handler2/1367\n\n CPU: 0 PID: 1367 Comm: handler2 Not tainted 5.12.0-rc6+ #418\n Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\n Call Trace:\n  dump_stack+0x92/0xc1\n  print_address_description.constprop.7+0x1a/0x150\n  kasan_report.cold.13+0x7f/0x111\n  ip_do_fragment+0x1b03/0x1f60\n  ovs_fragment+0x5bf/0x840 [openvswitch]\n  do_execute_actions+0x1bd5/0x2400 [openvswitch]\n  ovs_execute_actions+0xc8/0x3d0 [openvswitch]\n  ovs_packet_cmd_execute+0xa39/0x1150 [openvswitch]\n  genl_family_rcv_msg_doit.isra.15+0x227/0x2d0\n  genl_rcv_msg+0x287/0x490\n  netlink_rcv_skb+0x120/0x380\n  genl_rcv+0x24/0x40\n  netlink_unicast+0x439/0x630\n  netlink_sendmsg+0x719/0xbf0\n  sock_sendmsg+0xe2/0x110\n  ____sys_sendmsg+0x5ba/0x890\n  ___sys_sendmsg+0xe9/0x160\n  __sys_sendmsg+0xd3/0x170\n  do_syscall_64+0x33/0x40\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f957079db07\n Code: c3 66 90 41 54 41 89 d4 55 48 89 f5 53 89 fb 48 83 ec 10 e8 eb ec ff ff 44 89 e2 48 89 ee 89 df 41 89 c0 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 48 89 44 24 08 e8 24 ed ff ff 48\n RSP: 002b:00007f956ce35a50 EFLAGS: 00000293 ORIG_RAX: 000000000000002e\n RAX: ffffffffffffffda RBX: 0000000000000019 RCX: 00007f957079db07\n RDX: 0000000000000000 RSI: 00007f956ce35ae0 RDI: 0000000000000019\n RBP: 00007f956ce35ae0 R08: 0000000000000000 R09: 00007f9558006730\n R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000\n R13: 00007f956ce37308 R14: 00007f956ce35f80 R15: 00007f956ce35ae0\n\n The buggy address belongs to the page:\n page:00000000af2a1d93 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112fc7\n flags: 0x17ffffc0000000()\n raw: 0017ffffc0000000 0000000000000000 dead000000000122 0000000000000000\n raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n page dumped because: kasan: bad access detected\n\n addr ffff888112fc713c is located in stack of task handler2/1367 at offset 180 in frame:\n  ovs_fragment+0x0/0x840 [openvswitch]\n\n this frame has 2 objects:\n  [32, 144) 'ovs_dst'\n  [192, 424) 'ovs_rt'\n\n Memory state around the buggy address:\n  ffff888112fc7000: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ffff888112fc7080: 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00\n >ffff888112fc7100: 00 00 00 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00\n                                         ^\n  ffff888112fc7180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ffff888112fc7200: 00 00 00 00 00 00 f2 f2 f2 00 00 00 00 00 00 00\n\nfor IPv4 packets, ovs_fragment() uses a temporary struct dst_entry. Then,\nin the following call graph:\n\n  ip_do_fragment()\n    ip_skb_dst_mtu()\n      ip_dst_mtu_maybe_forward()\n        ip_mtu_locked()\n\nthe pointer to struct dst_entry is used as pointer to struct rtable: this\nturns the access to struct members like rt_mtu_locked into an OOB read in\nthe stack. Fix this changing the temporary variable used for IPv4 packets\nin ovs_fragment(), similarly to what is done for IPv6 few lines below."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/openvswitch/actions.c"],"versions":[{"version":"119bbaa6795a4f4aed46994cc7d9ab01989c87e3","lessThan":"b1d7280f9ba1bfdbc3af5bdb82e51f014854f26f","status":"affected","versionType":"git"},{"version":"d543907a4730400f5c5b684c57cb5bbbfd6136ab","lessThan":"23e17ec1a5eb53fe39cc34fa5592686d5acd0dac","status":"affected","versionType":"git"},{"version":"8387fbac8e18e26a60559adc63e0b7067303b0a4","lessThan":"5a52fa8ad45b5a593ed416adf326538638454ff1","status":"affected","versionType":"git"},{"version":"d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221","lessThan":"df9e900de24637be41879e2c50afb713ec4e8b2e","status":"affected","versionType":"git"},{"version":"d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221","lessThan":"490ad0a2390442d0a7b8c00972a83dbb09cab142","status":"affected","versionType":"git"},{"version":"d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221","lessThan":"a1478374b0bda89b4277a8afd39208271faad4be","status":"affected","versionType":"git"},{"version":"d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221","lessThan":"d841d3cf5297fde4ce6a41ff35451d0e82917f3e","status":"affected","versionType":"git"},{"version":"d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221","lessThan":"b3502b04e84ac5349be95fc033c17bd701d2787a","status":"affected","versionType":"git"},{"version":"d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221","lessThan":"7c0ea5930c1c211931819d83cfb157bff1539a4c","status":"affected","versionType":"git"},{"version":"df9ece1148e2ec242871623dedb004f7a1387125","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/openvswitch/actions.c"],"versions":[{"version":"4.16","status":"affected"},{"version":"0","lessThan":"4.16","status":"unaffected","versionType":"semver"},{"version":"4.4.269","lessThanOrEqual":"4.4.*","status":"unaffected","versionType":"semver"},{"version":"4.9.269","lessThanOrEqual":"4.9.*","status":"unaffected","versionType":"semver"},{"version":"4.14.233","lessThanOrEqual":"4.14.*","status":"unaffected","versionType":"semver"},{"version":"4.19.191","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.118","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.36","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.11.20","lessThanOrEqual":"5.11.*","status":"unaffected","versionType":"semver"},{"version":"5.12.3","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4.134","versionEndExcluding":"4.4.269"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9.104","versionEndExcluding":"4.9.269"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.45","versionEndExcluding":"4.14.233"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"4.19.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"5.4.118"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"5.10.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"5.11.20"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"5.12.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"5.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16.57"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b1d7280f9ba1bfdbc3af5bdb82e51f014854f26f"},{"url":"https://git.kernel.org/stable/c/23e17ec1a5eb53fe39cc34fa5592686d5acd0dac"},{"url":"https://git.kernel.org/stable/c/5a52fa8ad45b5a593ed416adf326538638454ff1"},{"url":"https://git.kernel.org/stable/c/df9e900de24637be41879e2c50afb713ec4e8b2e"},{"url":"https://git.kernel.org/stable/c/490ad0a2390442d0a7b8c00972a83dbb09cab142"},{"url":"https://git.kernel.org/stable/c/a1478374b0bda89b4277a8afd39208271faad4be"},{"url":"https://git.kernel.org/stable/c/d841d3cf5297fde4ce6a41ff35451d0e82917f3e"},{"url":"https://git.kernel.org/stable/c/b3502b04e84ac5349be95fc033c17bd701d2787a"},{"url":"https://git.kernel.org/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