{ "containers": { "cna": { "providerMetadata": { "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: sr: fix out-of-bounds read when setting HMAC data.\n\nThe SRv6 layer allows defining HMAC data that can later be used to sign IPv6\nSegment Routing Headers. This configuration is realised via netlink through\nfour attributes: SEG6_ATTR_HMACKEYID, SEG6_ATTR_SECRET, SEG6_ATTR_SECRETLEN and\nSEG6_ATTR_ALGID. Because the SECRETLEN attribute is decoupled from the actual\nlength of the SECRET attribute, it is possible to provide invalid combinations\n(e.g., secret = \"\", secretlen = 64). This case is not checked in the code and\nwith an appropriately crafted netlink message, an out-of-bounds read of up\nto 64 bytes (max secret length) can occur past the skb end pointer and into\nskb_shared_info:\n\nBreakpoint 1, seg6_genl_sethmac (skb=, info=) at net/ipv6/seg6.c:208\n208\t\tmemcpy(hinfo->secret, secret, slen);\n(gdb) bt\n #0 seg6_genl_sethmac (skb=, info=) at net/ipv6/seg6.c:208\n #1 0xffffffff81e012e9 in genl_family_rcv_msg_doit (skb=skb@entry=0xffff88800b1f9f00, nlh=nlh@entry=0xffff88800b1b7600,\n extack=extack@entry=0xffffc90000ba7af0, ops=ops@entry=0xffffc90000ba7a80, hdrlen=4, net=0xffffffff84237580 , family=,\n family=) at net/netlink/genetlink.c:731\n #2 0xffffffff81e01435 in genl_family_rcv_msg (extack=0xffffc90000ba7af0, nlh=0xffff88800b1b7600, skb=0xffff88800b1f9f00,\n family=0xffffffff82fef6c0 ) at net/netlink/genetlink.c:775\n #3 genl_rcv_msg (skb=0xffff88800b1f9f00, nlh=0xffff88800b1b7600, extack=0xffffc90000ba7af0) at net/netlink/genetlink.c:792\n #4 0xffffffff81dfffc3 in netlink_rcv_skb (skb=skb@entry=0xffff88800b1f9f00, cb=cb@entry=0xffffffff81e01350 )\n at net/netlink/af_netlink.c:2501\n #5 0xffffffff81e00919 in genl_rcv (skb=0xffff88800b1f9f00) at net/netlink/genetlink.c:803\n #6 0xffffffff81dff6ae in netlink_unicast_kernel (ssk=0xffff888010eec800, skb=0xffff88800b1f9f00, sk=0xffff888004aed000)\n at net/netlink/af_netlink.c:1319\n #7 netlink_unicast (ssk=ssk@entry=0xffff888010eec800, skb=skb@entry=0xffff88800b1f9f00, portid=portid@entry=0, nonblock=)\n at net/netlink/af_netlink.c:1345\n #8 0xffffffff81dff9a4 in netlink_sendmsg (sock=, msg=0xffffc90000ba7e48, len=) at net/netlink/af_netlink.c:1921\n...\n(gdb) p/x ((struct sk_buff *)0xffff88800b1f9f00)->head + ((struct sk_buff *)0xffff88800b1f9f00)->end\n$1 = 0xffff88800b1b76c0\n(gdb) p/x secret\n$2 = 0xffff88800b1b76c0\n(gdb) p slen\n$3 = 64 '@'\n\nThe OOB data can then be read back from userspace by dumping HMAC state. This\ncommit fixes this by ensuring SECRETLEN cannot exceed the actual length of\nSECRET." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/seg6.c" ], "versions": [ { "version": "4f4853dc1c9c", "lessThan": "dc9dbd65c803", "status": "affected", "versionType": "git" }, { "version": "4f4853dc1c9c", "lessThan": "f684c16971ed", "status": "affected", "versionType": "git" }, { "version": "4f4853dc1c9c", "lessThan": "3df71e11a477", "status": "affected", "versionType": "git" }, { "version": "4f4853dc1c9c", "lessThan": "076f2479fc5a", "status": "affected", "versionType": "git" }, { "version": "4f4853dc1c9c", "lessThan": "55195563ec29", "status": "affected", "versionType": "git" }, { "version": "4f4853dc1c9c", "lessThan": "56ad3f475482", "status": "affected", "versionType": "git" }, { "version": "4f4853dc1c9c", "lessThan": "84a53580c5d2", "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/seg6.c" ], "versions": [ { "version": "4.10", "status": "affected" }, { "version": "0", "lessThan": "4.10", "status": "unaffected", "versionType": "custom" }, { "version": "4.14.293", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "custom" }, { "version": "4.19.258", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.4.213", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.10.143", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.15.68", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.19.9", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/dc9dbd65c803af1607484fed5da50d41dc8dd864" }, { "url": "https://git.kernel.org/stable/c/f684c16971ed5e77dfa25a9ad25b5297e1f58eab" }, { "url": "https://git.kernel.org/stable/c/3df71e11a4773d775c3633c44319f7acdb89011c" }, { "url": "https://git.kernel.org/stable/c/076f2479fc5a15c4a970ca3b5e57d42ba09a31fa" }, { "url": "https://git.kernel.org/stable/c/55195563ec29f80f984237b743de0e2b6ba4d093" }, { "url": "https://git.kernel.org/stable/c/56ad3f475482bca55b0ae544031333018eb145b3" }, { "url": "https://git.kernel.org/stable/c/84a53580c5d2138c7361c7c3eea5b31827e63b35" } ], "title": "ipv6: sr: fix out-of-bounds read when setting HMAC data.", "x_generator": { "engine": "bippy-a5840b7849dd" } } }, "cveMetadata": { "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", "cveID": "CVE-2022-48687", "requesterUserId": "gregkh@kernel.org", "serial": "1", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.0" }