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                "status": "unaffected",
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            "defaultStatus": "unaffected",
            "packageName": "kpatch-patch",
            "product": "Red Hat Enterprise Linux 10",
            "vendor": "Red Hat"
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            "cpes": [
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            "defaultStatus": "unaffected",
            "packageName": "kernel",
            "product": "Red Hat Enterprise Linux 6",
            "vendor": "Red Hat"
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            "packageName": "kernel",
            "product": "Red Hat Enterprise Linux 7",
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            "cpes": [
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            "packageName": "kernel-rt",
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            "packageName": "kernel",
            "product": "Red Hat Enterprise Linux 9",
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            "product": "Red Hat Enterprise Linux 9",
            "vendor": "Red Hat"
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        "datePublic": "2026-04-24T00:00:00.000Z",
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            "value": "A flaw was found in the Linux kernel\u0027s rxrpc subsystem. An unprivileged local user could exploit an integer overflow vulnerability in the `rxrpc_preparse_xdr_yfs_rxgk()` function. This flaw occurs when processing specially crafted key and ticket lengths, causing an incorrect memory allocation size. Consequently, a heap buffer overflow can occur, potentially leading to arbitrary code execution or a denial of service."
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              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.3,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "LOW",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
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                "description": "Integer Overflow or Wraparound",
                "lang": "en",
                "type": "CWE"
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            "url": "https://access.redhat.com/security/cve/CVE-2026-31641"
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            "tags": [
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              "x_refsource_REDHAT"
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            "url": "https://access.redhat.com/errata/RHSA-2026:55618"
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        "solutions": [
          {
            "lang": "en",
            "value": "RHSA-2026:27288: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10)"
          },
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            "value": "RHSA-2026:55618: Red Hat Enterprise Linux BaseOS (v. 10)"
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            "time": "2026-04-24T00:00:00.000Z",
            "value": "Reported to Red Hat."
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            "lang": "en",
            "time": "2026-04-24T00:00:00.000Z",
            "value": "Made public."
          }
        ],
        "title": "kernel: rxrpc: Fix RxGK token loading to check bounds",
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            "value": "The rxrpc kernel module can be prevented from loading to mitigate this issue. This action may impact applications that rely on the rxrpc protocol.\nTo blacklist the rxrpc module:\n1. Create a file `/etc/modprobe.d/blacklist-rxrpc.conf` with the following content:\n   ```\n   blacklist rxrpc\n   install rxrpc /bin/true\n   ```\n2. Regenerate the initramfs:\n   ```bash\n   dracut -f -v\n   ```\n3. Reboot the system for the changes to take effect."
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          "product": "Linux",
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              "version": "6.16"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.18.23",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.19.13",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix RxGK token loading to check bounds\n\nrxrpc_preparse_xdr_yfs_rxgk() reads the raw key length and ticket length\nfrom the XDR token as u32 values and passes each through round_up(x, 4)\nbefore using the rounded value for validation and allocation.  When the raw\nlength is \u003e= 0xfffffffd, round_up() wraps to 0, so the bounds check and\nkzalloc both use 0 while the subsequent memcpy still copies the original\n~4 GiB value, producing a heap buffer overflow reachable from an\nunprivileged add_key() call.\n\nFix this by:\n\n (1) Rejecting raw key lengths above AFSTOKEN_GK_KEY_MAX and raw ticket\n     lengths above AFSTOKEN_GK_TOKEN_MAX before rounding, consistent with\n     the caps that the RxKAD path already enforces via AFSTOKEN_RK_TIX_MAX.\n\n (2) Sizing the flexible-array allocation from the validated raw key\n     length via struct_size_t() instead of the rounded value.\n\n (3) Caching the raw lengths so that the later field assignments and\n     memcpy calls do not re-read from the token, eliminating a class of\n     TOCTOU re-parse.\n\nThe control path (valid token with lengths within bounds) is unaffected."
        }
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            "baseSeverity": "HIGH",
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              "value": "AV:L - The vulnerable RxGK token parser is reachable through the local `add_key(\"rxrpc\", ...)` syscall with an attacker-supplied XDR payload. The network RxGK response path builds bounded lengths from packet data and does not allow the near-4GiB raw length values needed for this overflow.\nAC:L - An attacker can deterministically craft a small XDR token whose raw key or ticket length is \u003e= 0xfffffffd so `round_up()` wraps before validation/allocation. No race or victim-controlled timing is required.\nPR:L - The fix commit explicitly describes the bug as reachable from an unprivileged `add_key()` call. The only practical gate is write access to a user-writable keyring, which a normal local user can have without real root capabilities.\nUI:N - Exploitation only requires the attacker to invoke the syscall with a crafted payload. No separate victim action is needed.\nS:U - The vulnerable code runs in the kernel and impacts kernel memory within the same security authority. This is a standard local kernel compromise/DoS scenario rather than a defined cross-scope boundary escape.\nC:H - The bug is a heap memory corruption caused by copying a near-4GiB attacker-selected length from a small token into an undersized `rxgk_key` allocation. Such kernel memory corruption is defensibly scored as enabling high confidentiality impact.\nI:H - The vulnerable `memcpy()` writes far beyond the allocated heap object, giving a heap buffer overflow primitive. Under the required higher-severity rule, this is scored as potentially enabling arbitrary kernel memory modification or code execution.\nA:H - The malformed token can reliably trigger massive out-of-bounds kernel memory access/corruption. At minimum this can cause a kernel oops or panic, producing high availability impact."
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        "dateUpdated": "2026-08-05T12:24:05.369Z",
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    "cveId": "CVE-2026-31641",
    "datePublished": "2026-04-24T14:44:56.204Z",
    "dateReserved": "2026-03-09T15:48:24.126Z",
    "dateUpdated": "2026-08-20T12:31:55.191Z",
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