{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2023-53815",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-12-08T23:58:35.277Z",
        "datePublished": "2025-12-09T00:01:12.832Z",
        "dateUpdated": "2026-05-11T19:52:03.416Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T19:52:03.416Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nposix-timers: Prevent RT livelock in itimer_delete()\n\nitimer_delete() has a retry loop when the timer is concurrently expired. On\nnon-RT kernels this just spin-waits until the timer callback has completed,\nexcept for posix CPU timers which have HAVE_POSIX_CPU_TIMERS_TASK_WORK\nenabled.\n\nIn that case and on RT kernels the existing task could live lock when\npreempting the task which does the timer delivery.\n\nReplace spin_unlock() with an invocation of timer_wait_running() to handle\nit the same way as the other retry loops in the posix timer code."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/time/posix-timers.c"
                    ],
                    "versions": [
                        {
                            "version": "ec8f954a40da8cd3d159713b608e901f0cd909a9",
                            "lessThan": "f1be1ed32daa053484222f7f9beb2b16c624dffd",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ec8f954a40da8cd3d159713b608e901f0cd909a9",
                            "lessThan": "0670c4c567b27bd8f999a943028f4fe60d1a1106",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ec8f954a40da8cd3d159713b608e901f0cd909a9",
                            "lessThan": "e7aff15ba29ba4b3052786b1636fa5c4aa39e179",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ec8f954a40da8cd3d159713b608e901f0cd909a9",
                            "lessThan": "f9bd298e3e4d3fd6e19f017789a42d0f332cd555",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ec8f954a40da8cd3d159713b608e901f0cd909a9",
                            "lessThan": "c1968bb8a28625cc95d2ad3ca872ab98c9c36d59",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ec8f954a40da8cd3d159713b608e901f0cd909a9",
                            "lessThan": "9d9e522010eb5685d8b53e8a24320653d9d4cbbf",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/time/posix-timers.c"
                    ],
                    "versions": [
                        {
                            "version": "5.4",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.4",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.188",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.121",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.39",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.3.13",
                            "lessThanOrEqual": "6.3.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.4.4",
                            "lessThanOrEqual": "6.4.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.5",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.4",
                                    "versionEndExcluding": "5.10.188"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.4",
                                    "versionEndExcluding": "5.15.121"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.4",
                                    "versionEndExcluding": "6.1.39"
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.4",
                                    "versionEndExcluding": "6.3.13"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.4",
                                    "versionEndExcluding": "6.4.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.4",
                                    "versionEndExcluding": "6.5"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/f1be1ed32daa053484222f7f9beb2b16c624dffd"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0670c4c567b27bd8f999a943028f4fe60d1a1106"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e7aff15ba29ba4b3052786b1636fa5c4aa39e179"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f9bd298e3e4d3fd6e19f017789a42d0f332cd555"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c1968bb8a28625cc95d2ad3ca872ab98c9c36d59"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9d9e522010eb5685d8b53e8a24320653d9d4cbbf"
                }
            ],
            "title": "posix-timers: Prevent RT livelock in itimer_delete()",
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}