RHSA-2026:99722

Vulnerability from csaf_redhat - Published: 2026-11-12 17:46 - Updated: 2026-11-12 23:19
Summary
Red Hat Security Advisory: kpatch-patch-6_12_0-211_16_1 and kpatch-patch-6_12_0-211_49_1 security update
Severity
Important
Notes
Topic: An update for multiple packages is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. 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: This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-6.12.0-211.16.1.el10_2. Security Fix(es): * kernel: smb: client: validate the whole DACL before rewriting it in cifsacl (CVE-2026-31709) * kernel: af_unix: Set gc_in_progress to true in unix_gc() (CVE-2026-53361) * kernel: udp: fix potential use-after-free in tunnel segmentation (CVE-2026-74705) * kernel: net: tun: bound receive headroom (CVE-2026-81000) 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's Server Message Block (SMB) client, specifically within the cifsacl functionality. A malicious SMB server could provide a malformed Discretionary Access Control List (DACL) that claims to contain more Access Control Entries (ACEs) than are actually present. This insufficient validation allows the kernel to read or copy data beyond the intended memory boundaries, leading to memory corruption. This could potentially result in information disclosure or a denial of service.

CWE-1288 - Improper Validation of Consistency within Input
Affected products
Product Identifier Version Remediation
Unresolved product id: BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_16_1-0:2-12.el10_2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_16_1-0:2-12.el10_2.src —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_16_1-0:2-12.el10_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_16_1-debuginfo-0:2-12.el10_2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_16_1-debuginfo-0:2-12.el10_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_16_1-debugsource-0:2-12.el10_2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_49_1-0:2-4.el10_2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_49_1-0:2-4.el10_2.src —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_49_1-0:2-4.el10_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_49_1-debuginfo-0:2-4.el10_2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_49_1-debuginfo-0:2-4.el10_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_49_1-debugsource-0:2-4.el10_2.ppc64le —
Vendor Fix fix
Workaround
Threats
Impact Important

A flaw was found in the Linux kernel's `af_unix` component. A race condition exists within the `unix_gc()` garbage collection function where the `gc_in_progress` flag may not be correctly set. This could lead to `unix_peek_fpl()` misinterpreting garbage collection status when handling `MSG_PEEK` operations, potentially causing unexpected behavior or information disclosure to a local attacker.

CWE-366 - Race Condition within a Thread
Affected products
Fixed 12 products, the same list as for CVE-2026-31709
Threats
Impact Important

A flaw was found in the Linux kernel's UDP (User Datagram Protocol) tunnel segmentation. This vulnerability arises when the system attempts to process network packets, specifically in the __skb_udp_tunnel_segment() function. An attacker could potentially exploit a use-after-free condition, where the system attempts to use memory that has already been released, leading to system instability or potentially arbitrary code execution.

CWE-416 - Use After Free
Affected products
Fixed 12 products, the same list as for CVE-2026-31709
Threats
Impact Important

A flaw was found in the Linux kernel's TUN/TAP driver. An integer underflow vulnerability exists in the tun_get_user() function when processing oversized headroom requests. This can occur if Open vSwitch (OVS) propagates an excessively large headroom request to the TUN or TAP device. Successful exploitation could lead to memory corruption, where network packet data is written outside its intended buffer, potentially causing a denial of service or other system instability.

CWE-787 - Out-of-bounds Write
Affected products
Fixed 12 products, the same list as for CVE-2026-31709
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:99722 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2464476 external
https://bugzilla.redhat.com/show_bug.cgi?id=2497035 external
https://bugzilla.redhat.com/show_bug.cgi?id=2521498 external
https://bugzilla.redhat.com/show_bug.cgi?id=2532176 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-31709 self
https://bugzilla.redhat.com/show_bug.cgi?id=2464476 external
https://www.cve.org/CVERecord?id=CVE-2026-31709 external
https://nvd.nist.gov/vuln/detail/CVE-2026-31709 external
https://lore.kernel.org/linux-cve-announce/202605… external
https://access.redhat.com/security/cve/CVE-2026-53361 self
https://bugzilla.redhat.com/show_bug.cgi?id=2497035 external
https://www.cve.org/CVERecord?id=CVE-2026-53361 external
https://nvd.nist.gov/vuln/detail/CVE-2026-53361 external
https://lore.kernel.org/linux-cve-announce/202607… external
https://access.redhat.com/security/cve/CVE-2026-74705 self
https://bugzilla.redhat.com/show_bug.cgi?id=2521498 external
https://www.cve.org/CVERecord?id=CVE-2026-74705 external
https://nvd.nist.gov/vuln/detail/CVE-2026-74705 external
https://git.kernel.org/pub/scm/linux/security/vul… external
https://access.redhat.com/security/cve/CVE-2026-81000 self
https://bugzilla.redhat.com/show_bug.cgi?id=2532176 external
https://access.redhat.com/security/vulnerabilitie… external
https://www.cve.org/CVERecord?id=CVE-2026-81000 external
https://nvd.nist.gov/vuln/detail/CVE-2026-81000 external
https://git.kernel.org/pub/scm/linux/security/vul… external

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          "text": "A flaw was found in the Linux kernel\u0027s Server Message Block (SMB) client, specifically within the cifsacl functionality. A malicious SMB server could provide a malformed Discretionary Access Control List (DACL) that claims to contain more Access Control Entries (ACEs) than are actually present. This insufficient validation allows the kernel to read or copy data beyond the intended memory boundaries, leading to memory corruption. This could potentially result in information disclosure or a denial of service.",
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            "BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_16_1-0:2-12.el10_2.src",
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            "BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_49_1-0:2-4.el10_2.ppc64le",
            "BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_49_1-0:2-4.el10_2.src",
            "BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_49_1-0:2-4.el10_2.x86_64",
            "BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_49_1-debuginfo-0:2-4.el10_2.ppc64le",
            "BaseOS-10.2.Z.E2S:kpatch-patch-6_12_0-211_49_1-debuginfo-0:2-4.el10_2.x86_64",
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: net: tun: bound receive headroom"
    }
  ]
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Events included in the timeline

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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.