cve-2021-47515
Vulnerability from cvelistv5
Published
2024-05-24 15:09
Modified
2025-05-04 12:41
Severity ?
Summary
seg6: fix the iif in the IPv6 socket control block
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6431e71093f3da586a00c6d931481ffb0dc2db0ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/666521b3852d2b2f52d570f9122b1e4b50d96831Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/98adb2bbfa407c9290bda299d4c6f7a1c4ebd5e1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ae68d93354e5bf5191ee673982251864ea24dd5cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b16d412e5f79734033df04e97d7ea2f50a8e9fe3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef8804e47c0a44ae106ead1740408af5ea6c6ee9Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6431e71093f3da586a00c6d931481ffb0dc2db0ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/666521b3852d2b2f52d570f9122b1e4b50d96831Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/98adb2bbfa407c9290bda299d4c6f7a1c4ebd5e1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ae68d93354e5bf5191ee673982251864ea24dd5cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b16d412e5f79734033df04e97d7ea2f50a8e9fe3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ef8804e47c0a44ae106ead1740408af5ea6c6ee9Patch
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nseg6: fix the iif in the IPv6 socket control block\n\nWhen an IPv4 packet is received, the ip_rcv_core(...) sets the receiving\ninterface index into the IPv4 socket control block (v5.16-rc4,\nnet/ipv4/ip_input.c line 510):\n\n    IPCB(skb)-\u003eiif = skb-\u003eskb_iif;\n\nIf that IPv4 packet is meant to be encapsulated in an outer IPv6+SRH\nheader, the seg6_do_srh_encap(...) performs the required encapsulation.\nIn this case, the seg6_do_srh_encap function clears the IPv6 socket control\nblock (v5.16-rc4 net/ipv6/seg6_iptunnel.c line 163):\n\n    memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));\n\nThe memset(...) was introduced in commit ef489749aae5 (\"ipv6: sr: clear\nIP6CB(skb) on SRH ip4ip6 encapsulation\") a long time ago (2019-01-29).\n\nSince the IPv6 socket control block and the IPv4 socket control block share\nthe same memory area (skb-\u003ecb), the receiving interface index info is lost\n(IP6CB(skb)-\u003eiif is set to zero).\n\nAs a side effect, that condition triggers a NULL pointer dereference if\ncommit 0857d6f8c759 (\"ipv6: When forwarding count rx stats on the orig\nnetdev\") is applied.\n\nTo fix that issue, we set the IP6CB(skb)-\u003eiif with the index of the\nreceiving interface once again."
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47515\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-24T15:15:12.937\",\"lastModified\":\"2025-09-24T19:37:09.340\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nseg6: fix the iif in the IPv6 socket control block\\n\\nWhen an IPv4 packet is received, the ip_rcv_core(...) sets the receiving\\ninterface index into the IPv4 socket control block (v5.16-rc4,\\nnet/ipv4/ip_input.c line 510):\\n\\n    IPCB(skb)-\u003eiif = skb-\u003eskb_iif;\\n\\nIf that IPv4 packet is meant to be encapsulated in an outer IPv6+SRH\\nheader, the seg6_do_srh_encap(...) performs the required encapsulation.\\nIn this case, the seg6_do_srh_encap function clears the IPv6 socket control\\nblock (v5.16-rc4 net/ipv6/seg6_iptunnel.c line 163):\\n\\n    memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));\\n\\nThe memset(...) was introduced in commit ef489749aae5 (\\\"ipv6: sr: clear\\nIP6CB(skb) on SRH ip4ip6 encapsulation\\\") a long time ago (2019-01-29).\\n\\nSince the IPv6 socket control block and the IPv4 socket control block share\\nthe same memory area (skb-\u003ecb), the receiving interface index info is lost\\n(IP6CB(skb)-\u003eiif is set to zero).\\n\\nAs a side effect, that condition triggers a NULL pointer dereference if\\ncommit 0857d6f8c759 (\\\"ipv6: When forwarding count rx stats on the orig\\nnetdev\\\") is applied.\\n\\nTo fix that issue, we set the IP6CB(skb)-\u003eiif with the index of the\\nreceiving interface once again.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: seg6: corrige el iif en el bloque de control del socket IPv6 Cuando se recibe un paquete IPv4, ip_rcv_core(...) establece el \u00edndice de la interfaz de recepci\u00f3n en el bloque de control del socket IPv4 (v5 .16-rc4, net/ipv4/ip_input.c l\u00ednea 510): IPCB(skb)-\u0026gt;iif = skb-\u0026gt;skb_iif; Si ese paquete IPv4 debe encapsularse en un encabezado IPv6+SRH externo, seg6_do_srh_encap(...) realiza la encapsulaci\u00f3n requerida. En este caso, la funci\u00f3n seg6_do_srh_encap borra el bloque de control del socket IPv6 (v5.16-rc4 net/ipv6/seg6_iptunnel.c l\u00ednea 163): memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); El memset(...) se introdujo en El commit ef489749aae5 (\\\"ipv6: sr: clear IP6CB(skb) en la encapsulaci\u00f3n SRH ip4ip6\\\") hace mucho tiempo (29 de enero de 2019). Dado que el bloque de control del socket IPv6 y el bloque de control del socket IPv4 comparten la misma \u00e1rea de memoria (skb-\u0026gt;cb), la informaci\u00f3n del \u00edndice de la interfaz de recepci\u00f3n se pierde (IP6CB(skb)-\u0026gt;iif se establece en cero). Como efecto secundario, esa condici\u00f3n desencadena una desreferencia del puntero NULL si se aplica el commit 0857d6f8c759 (\\\"ipv6: al reenviar estad\u00edsticas de recuento de rx en el netdev original\\\"). Para solucionar ese problema, configuramos IP6CB(skb)-\u0026gt;iif con el \u00edndice de la interfaz de recepci\u00f3n una vez m\u00e1s.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.14.98\",\"versionEndExcluding\":\"4.14.258\",\"matchCriteriaId\":\"72C9A7C8-757B-4EFB-AC4E-B383EFFEF45C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.19.20\",\"versionEndExcluding\":\"4.19.221\",\"matchCriteriaId\":\"9F887262-DA38-45C9-BED5-4D65E50DB9C0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20.7\",\"versionEndExcluding\":\"5.0\",\"matchCriteriaId\":\"232F87BF-8F17-4BEB-80A0-49489CB86DDA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.0.1\",\"versionEndExcluding\":\"5.4.165\",\"matchCriteriaId\":\"A29CBCD8-CCB1-42FD-BFC8-FD77C4D2FD57\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.85\",\"matchCriteriaId\":\"D9668578-08F7-4694-A86F-FCE448387A79\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.8\",\"matchCriteriaId\":\"6664ACE2-F748-4AE5-B98B-58803B0B2C3E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.0:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"1D0FE595-0CFE-4491-808B-CEF691CE7B0A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.0:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"FDF49B77-4688-4908-9239-89B729456D22\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.0:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"77F342FB-3D7B-4EAE-BF8B-57B7B860BAFD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.0:rc8:*:*:*:*:*:*\",\"matchCriteriaId\":\"47D61679-6515-4E18-83C7-A71982CCD83C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"357AA433-37E8-4323-BFB2-3038D6E4B414\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"A73429BA-C2D9-4D0C-A75F-06A1CA8B3983\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F621B5E3-E99D-49E7-90B9-EC3B77C95383\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"F7BFDCAA-1650-49AA-8462-407DD593F94F\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6431e71093f3da586a00c6d931481ffb0dc2db0e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/666521b3852d2b2f52d570f9122b1e4b50d96831\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/98adb2bbfa407c9290bda299d4c6f7a1c4ebd5e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ae68d93354e5bf5191ee673982251864ea24dd5c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b16d412e5f79734033df04e97d7ea2f50a8e9fe3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ef8804e47c0a44ae106ead1740408af5ea6c6ee9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6431e71093f3da586a00c6d931481ffb0dc2db0e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/666521b3852d2b2f52d570f9122b1e4b50d96831\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/98adb2bbfa407c9290bda299d4c6f7a1c4ebd5e1\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ae68d93354e5bf5191ee673982251864ea24dd5c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b16d412e5f79734033df04e97d7ea2f50a8e9fe3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags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  }
}


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