RHSA-2026:7003

Vulnerability from csaf_redhat - Published: 2026-04-08 08:35 - Updated: 2026-04-08 19:39
Summary
Red Hat Security Advisory: kernel security update
Severity
Moderate
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: Linux kernel: Device Mapper RAID out-of-bounds access (CVE-2022-49674) * kernel: Linux kernel: Use-After-Free vulnerability in ATM subsystem (CVE-2025-38180) * kernel: Linux kernel: integer overflow and information disclosure via undefined shift operation in drm/amdkfd (CVE-2021-4460) * kernel: sctp: avoid NULL dereference when chunk data buffer is missing (CVE-2025-40240) * kernel: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() (CVE-2025-71085) * kernel: macvlan: fix error recovery in macvlan_common_newlink() (CVE-2026-23209) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2021-4460

A flaw was found in the Linux kernel’s AMD Kernel Fusion Driver (amdkfd) within the drm subsystem. When either get_num_sdma_queues() or get_num_xgmi_sdma_queues() returned 0, the driver performed a bit shift where the number of bits shifted equaled the operand width. Such a shift is undefined behavior in C and can lead to incorrect values being used in subsequent logic.A local user with the ability to exercise the affected kernel APIs could trigger unintended behavior in the DRM/AMD GPU driver, which may result in a kernel crash and impact system availability

5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-1335 - Incorrect Bitwise Shift of Integer
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:7003
Workaround To mitigate this issue, the `amdkfd` kernel module can be prevented from loading by blacklisting it. Create a file `/etc/modprobe.d/blacklist-amdkfd.conf` with the content `blacklist amdkfd`. A system reboot is required for this change to take effect. This may impact functionality that relies on the AMDGPU kernel graphics driver.
CVE-2022-49674

A flaw was found in the Linux kernel's device mapper (dm) RAID component. This vulnerability allows an attacker to cause an out-of-bounds memory access via loading a crafted dm-raid table. This may lead to a crash.

6.1 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
CWE-805 - Buffer Access with Incorrect Length Value
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:7003
CVE-2025-38180

A flaw was found in the Linux kernel's Asynchronous Transfer Mode (ATM) subsystem. An authenticated local attacker could exploit a Use-After-Free (UAF) vulnerability in the /proc/net/atm/lec handling. This flaw occurs due to improper dev_put() calls without prior dev_hold() calls, leading to an imbalance in reference counting. Successful exploitation could allow the attacker to achieve privilege escalation or cause a denial of service.

7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-911 - Improper Update of Reference Count
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:7003
CVE-2025-40240

In the Linux kernel, the following vulnerability has been resolved: sctp: avoid NULL dereference when chunk data buffer is missing chunk->skb pointer is dereferenced in the if-block where it's supposed to be NULL only. chunk->skb can only be NULL if chunk->head_skb is not. Check for frag_list instead and do it just before replacing chunk->skb. We're sure that otherwise chunk->skb is non-NULL because of outer if() condition.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-476 - NULL Pointer Dereference
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:7003
Workaround To mitigate this issue, prevent module sctp from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
CVE-2025-71085

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);

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-190 - Integer Overflow or Wraparound
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:7003
Workaround Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
CVE-2026-23209

A use-after-free vulnerability was found in the macvlan driver. When creating a macvlan interface in source mode fails after the source MAC has been added to the hash table (e.g., due to an invalid interface name), the hash entry still references the freed net_device structure. Subsequent packets matching that source MAC trigger use-after-free in macvlan_forward_source().

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:7003
Workaround To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
References
https://access.redhat.com/errata/RHSA-2026:7003 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2347967 external
https://bugzilla.redhat.com/show_bug.cgi?id=2376376 external
https://bugzilla.redhat.com/show_bug.cgi?id=2400732 external
https://bugzilla.redhat.com/show_bug.cgi?id=2418832 external
https://bugzilla.redhat.com/show_bug.cgi?id=2429026 external
https://bugzilla.redhat.com/show_bug.cgi?id=2439900 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2021-4460 self
https://bugzilla.redhat.com/show_bug.cgi?id=2400732 external
https://www.cve.org/CVERecord?id=CVE-2021-4460 external
https://nvd.nist.gov/vuln/detail/CVE-2021-4460 external
https://lore.kernel.org/linux-cve-announce/202510… external
https://access.redhat.com/security/cve/CVE-2022-49674 self
https://bugzilla.redhat.com/show_bug.cgi?id=2347967 external
https://www.cve.org/CVERecord?id=CVE-2022-49674 external
https://nvd.nist.gov/vuln/detail/CVE-2022-49674 external
https://lore.kernel.org/linux-cve-announce/202502… external
https://access.redhat.com/security/cve/CVE-2025-38180 self
https://bugzilla.redhat.com/show_bug.cgi?id=2376376 external
https://www.cve.org/CVERecord?id=CVE-2025-38180 external
https://nvd.nist.gov/vuln/detail/CVE-2025-38180 external
https://lore.kernel.org/linux-cve-announce/202507… external
https://access.redhat.com/security/cve/CVE-2025-40240 self
https://bugzilla.redhat.com/show_bug.cgi?id=2418832 external
https://www.cve.org/CVERecord?id=CVE-2025-40240 external
https://nvd.nist.gov/vuln/detail/CVE-2025-40240 external
https://lore.kernel.org/linux-cve-announce/202512… external
https://access.redhat.com/security/cve/CVE-2025-71085 self
https://bugzilla.redhat.com/show_bug.cgi?id=2429026 external
https://www.cve.org/CVERecord?id=CVE-2025-71085 external
https://nvd.nist.gov/vuln/detail/CVE-2025-71085 external
https://lore.kernel.org/linux-cve-announce/202601… external
https://access.redhat.com/security/cve/CVE-2026-23209 self
https://bugzilla.redhat.com/show_bug.cgi?id=2439900 external
https://www.cve.org/CVERecord?id=CVE-2026-23209 external
https://nvd.nist.gov/vuln/detail/CVE-2026-23209 external
https://lore.kernel.org/linux-cve-announce/202602… external
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        "name": "Incorrect Bitwise Shift of Integer"
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          "category": "description",
          "text": "A flaw was found in the Linux kernel\u2019s AMD Kernel Fusion Driver (amdkfd) within the drm subsystem. When either get_num_sdma_queues() or get_num_xgmi_sdma_queues() returned 0, the driver performed a bit shift where the number of bits shifted equaled the operand width. Such a shift is undefined behavior in C and can lead to incorrect values being used in subsequent logic.A local user with the ability to exercise the affected kernel APIs could trigger unintended behavior in the DRM/AMD GPU driver, which may result in a kernel crash and impact system availability",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Linux kernel: integer overflow and information disclosure via undefined shift operation in drm/amdkfd",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-4460"
        },
        {
          "category": "external",
          "summary": "RHBZ#2400732",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2400732"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-4460",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-4460"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-4460",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-4460"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2025100114-CVE-2021-4460-aa71@gregkh/T",
          "url": "https://lore.kernel.org/linux-cve-announce/2025100114-CVE-2021-4460-aa71@gregkh/T"
        }
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      "release_date": "2025-10-01T00:00:00+00:00",
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          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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          "details": "Moderate"
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      "title": "kernel: Linux kernel: integer overflow and information disclosure via undefined shift operation in drm/amdkfd"
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      "cve": "CVE-2022-49674",
      "cwe": {
        "id": "CWE-805",
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          "text": "2347967"
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          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s device mapper (dm) RAID component. This vulnerability allows an attacker to cause an out-of-bounds memory access via loading a crafted dm-raid table. This may lead to a crash.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Linux kernel: Device Mapper RAID out-of-bounds access",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The highest threat of this flaw is to system availability. A local attacker could trigger an out-of-bounds access in the dm-raid module by loading a specially crafted dm-raid table, leading to a system crash.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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      "title": "kernel: Linux kernel: Device Mapper RAID out-of-bounds access"
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    {
      "cve": "CVE-2025-38180",
      "cwe": {
        "id": "CWE-911",
        "name": "Improper Update of Reference Count"
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      "discovery_date": "2025-07-04T00:00:00+00:00",
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          "text": "2376376"
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        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s Asynchronous Transfer Mode (ATM) subsystem. An authenticated local attacker could exploit a Use-After-Free (UAF) vulnerability in the /proc/net/atm/lec handling. This flaw occurs due to improper dev_put() calls without prior dev_hold() calls, leading to an imbalance in reference counting. Successful exploitation could allow the attacker to achieve privilege escalation or cause a denial of service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Linux kernel: Use-After-Free vulnerability in ATM subsystem",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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          "summary": "https://lore.kernel.org/linux-cve-announce/2025070410-CVE-2025-38180-c6d0@gregkh/T",
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
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      ],
      "title": "kernel: Linux kernel: Use-After-Free vulnerability in ATM subsystem"
    },
    {
      "cve": "CVE-2025-40240",
      "cwe": {
        "id": "CWE-476",
        "name": "NULL Pointer Dereference"
      },
      "discovery_date": "2025-12-04T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2418832"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: avoid NULL dereference when chunk data buffer is missing\n\nchunk-\u003eskb pointer is dereferenced in the if-block where it\u0027s supposed\nto be NULL only.\n\nchunk-\u003eskb can only be NULL if chunk-\u003ehead_skb is not. Check for frag_list\ninstead and do it just before replacing chunk-\u003eskb. We\u0027re sure that\notherwise chunk-\u003eskb is non-NULL because of outer if() condition.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: sctp: avoid NULL dereference when chunk data buffer is missing",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A missing data buffer (frag_list) in SCTP chunk processing could trigger a NULL pointer dereference when handling GSO packets.\nA remote attacker sending a malformed SCTP packet could cause a kernel crash (DoS).\nThe system is vulnerable only if CONFIG_IP_SCTP enabled in Kernel configuration (and for the Red Hat Enterprise Linux it is always disabled in older versions and enabled as module in latest versions only). However even if module exists in Red Hat Enterprise Linux, still admin need to specially enable it usage (make some SCTP listening port available) before exploitation would be possible.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-40240"
        },
        {
          "category": "external",
          "summary": "RHBZ#2418832",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2418832"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-40240",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-40240"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40240",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40240"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2025120403-CVE-2025-40240-745a@gregkh/T",
          "url": "https://lore.kernel.org/linux-cve-announce/2025120403-CVE-2025-40240-745a@gregkh/T"
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          "date": "2026-04-08T08:35:32+00:00",
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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          "details": "Moderate"
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      "title": "kernel: sctp: avoid NULL dereference when chunk data buffer is missing"
    },
    {
      "cve": "CVE-2025-71085",
      "cwe": {
        "id": "CWE-190",
        "name": "Integer Overflow or Wraparound"
      },
      "discovery_date": "2026-01-13T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2429026"
        }
      ],
      "notes": [
        {
          "category": "description",
          "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": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability allows an unprivileged user to trigger a kernel BUG by causing an integer overflow in the headroom calculation used by skb_cow(), which results in a negative size passed to pskb_expand_head(). The kernel subsequently hits a reachable BUG_ON() and crashes, leading to a reliable denial-of-service condition. In worst-case scenarios, this path may be reachable via crafted IPv6 traffic with CALIPSO options.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-71085"
        },
        {
          "category": "external",
          "summary": "RHBZ#2429026",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429026"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-71085",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-71085"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-71085",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-71085"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2026011340-CVE-2025-71085-e6c1@gregkh/T",
          "url": "https://lore.kernel.org/linux-cve-announce/2026011340-CVE-2025-71085-e6c1@gregkh/T"
        }
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      "release_date": "2026-01-13T00:00:00+00:00",
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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          "details": "Moderate"
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      "title": "kernel: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()"
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    {
      "cve": "CVE-2026-23209",
      "cwe": {
        "id": "CWE-825",
        "name": "Expired Pointer Dereference"
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      "discovery_date": "2026-02-14T00:00:00+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2439900"
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        {
          "category": "description",
          "text": "A use-after-free vulnerability was found in the macvlan driver. When creating a macvlan interface in source mode fails after the source MAC has been added to the hash table (e.g., due to an invalid interface name), the hash entry still references the freed net_device structure. Subsequent packets matching that source MAC trigger use-after-free in macvlan_forward_source().",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: macvlan: fix error recovery in macvlan_common_newlink()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability can be exploited by a local user with CAP_NET_ADMIN to trigger use-after-free by creating a macvlan with an invalid name. The detailed reproducer and analysis were provided by a security researcher. This could potentially be used for privilege escalation via controlled memory corruption.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel: macvlan: fix error recovery in macvlan_common_newlink()"
    }
  ]
}


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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.