{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50816", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-30T12:06:07.130Z", "datePublished": "2025-12-30T12:08:32.215Z", "dateUpdated": "2026-05-11T19:25:40.382Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:25:40.382Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: ensure sane device mtu in tunnels\n\nAnother syzbot report [1] with no reproducer hints\nat a bug in ip6_gre tunnel (dev:ip6gretap0)\n\nSince ipv6 mcast code makes sure to read dev->mtu once\nand applies a sanity check on it (see commit b9b312a7a451\n\"ipv6: mcast: better catch silly mtu values\"), a remaining\npossibility is that a layer is able to set dev->mtu to\nan underflowed value (high order bit set).\n\nThis could happen indeed in ip6gre_tnl_link_config_route(),\nip6_tnl_link_config() and ipip6_tunnel_bind_dev()\n\nMake sure to sanitize mtu value in a local variable before\nit is written once on dev->mtu, as lockless readers could\ncatch wrong temporary value.\n\n[1]\nskbuff: skb_over_panic: text:ffff80000b7a2f38 len:40 put:40 head:ffff000149dcf200 data:ffff000149dcf2b0 tail:0xd8 end:0xc0 dev:ip6gretap0\n------------[ cut here ]------------\nkernel BUG at net/core/skbuff.c:120\nInternal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP\nModules linked in:\nCPU: 1 PID: 10241 Comm: kworker/1:1 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022\nWorkqueue: mld mld_ifc_work\npstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : skb_panic+0x4c/0x50 net/core/skbuff.c:116\nlr : skb_panic+0x4c/0x50 net/core/skbuff.c:116\nsp : ffff800020dd3b60\nx29: ffff800020dd3b70 x28: 0000000000000000 x27: ffff00010df2a800\nx26: 00000000000000c0 x25: 00000000000000b0 x24: ffff000149dcf200\nx23: 00000000000000c0 x22: 00000000000000d8 x21: ffff80000b7a2f38\nx20: ffff00014c2f7800 x19: 0000000000000028 x18: 00000000000001a9\nx17: 0000000000000000 x16: ffff80000db49158 x15: ffff000113bf1a80\nx14: 0000000000000000 x13: 00000000ffffffff x12: ffff000113bf1a80\nx11: ff808000081c0d5c x10: 0000000000000000 x9 : 73f125dc5c63ba00\nx8 : 73f125dc5c63ba00 x7 : ffff800008161d1c x6 : 0000000000000000\nx5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000\nx2 : ffff0001fefddcd0 x1 : 0000000100000000 x0 : 0000000000000089\nCall trace:\nskb_panic+0x4c/0x50 net/core/skbuff.c:116\nskb_over_panic net/core/skbuff.c:125 [inline]\nskb_put+0xd4/0xdc net/core/skbuff.c:2049\nip6_mc_hdr net/ipv6/mcast.c:1714 [inline]\nmld_newpack+0x14c/0x270 net/ipv6/mcast.c:1765\nadd_grhead net/ipv6/mcast.c:1851 [inline]\nadd_grec+0xa20/0xae0 net/ipv6/mcast.c:1989\nmld_send_cr+0x438/0x5a8 net/ipv6/mcast.c:2115\nmld_ifc_work+0x38/0x290 net/ipv6/mcast.c:2653\nprocess_one_work+0x2d8/0x504 kernel/workqueue.c:2289\nworker_thread+0x340/0x610 kernel/workqueue.c:2436\nkthread+0x12c/0x158 kernel/kthread.c:376\nret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860\nCode: 91011400 aa0803e1 a90027ea 94373093 (d4210000)" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/ip6_gre.c", "net/ipv6/ip6_tunnel.c", "net/ipv6/sit.c" ], "versions": [ { "version": "c12b395a46646bab69089ce7016ac78177f6001f", "lessThan": "2bab6fa449d16af36d9c9518865f783a15f446c7", "status": "affected", "versionType": "git" }, { "version": "c12b395a46646bab69089ce7016ac78177f6001f", "lessThan": "78297d513157a31fd629626fe4cbb85a7dcbb94a", "status": "affected", "versionType": "git" }, { "version": "c12b395a46646bab69089ce7016ac78177f6001f", "lessThan": "af51fc23a03f02b0c6df09ab0d60f23794436052", "status": "affected", "versionType": "git" }, { "version": "c12b395a46646bab69089ce7016ac78177f6001f", "lessThan": "44affe7ede596f078c4f2f41e0d160266ccda818", "status": "affected", "versionType": "git" }, { "version": "c12b395a46646bab69089ce7016ac78177f6001f", "lessThan": "ad3f1d9bf162c487d23df684852597961b745cae", "status": "affected", "versionType": "git" }, { "version": "c12b395a46646bab69089ce7016ac78177f6001f", "lessThan": "ccd94bd4939690e24d13e23814bce7ed853a09f3", "status": "affected", "versionType": "git" }, { "version": "c12b395a46646bab69089ce7016ac78177f6001f", "lessThan": "d89d7ff01235f218dad37de84457717f699dee79", "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/ipv6/ip6_gre.c", "net/ipv6/ip6_tunnel.c", "net/ipv6/sit.c" ], "versions": [ { "version": "3.7", "status": "affected" }, { "version": "0", "lessThan": "3.7", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.305", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.272", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.231", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.153", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.77", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.7", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "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": "3.7", "versionEndExcluding": "4.14.305" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "4.19.272" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "5.4.231" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "5.10.153" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "5.15.77" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.0.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2bab6fa449d16af36d9c9518865f783a15f446c7" }, { "url": "https://git.kernel.org/stable/c/78297d513157a31fd629626fe4cbb85a7dcbb94a" }, { "url": "https://git.kernel.org/stable/c/af51fc23a03f02b0c6df09ab0d60f23794436052" }, { "url": "https://git.kernel.org/stable/c/44affe7ede596f078c4f2f41e0d160266ccda818" }, { "url": "https://git.kernel.org/stable/c/ad3f1d9bf162c487d23df684852597961b745cae" }, { "url": "https://git.kernel.org/stable/c/ccd94bd4939690e24d13e23814bce7ed853a09f3" }, { "url": "https://git.kernel.org/stable/c/d89d7ff01235f218dad37de84457717f699dee79" } ], "title": "ipv6: ensure sane device mtu in tunnels", "x_generator": { "engine": "bippy-1.2.0" } } } }