{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.1",
    "cveMetadata": {
        "cveId": "CVE-2024-26737",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2024-02-19T14:20:24.166Z",
        "datePublished": "2024-04-03T17:00:23.414Z",
        "dateUpdated": "2024-08-02T00:14:13.230Z"
    },
    "containers": {
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                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2024-05-29T05:21:48.667Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix racing between bpf_timer_cancel_and_free and bpf_timer_cancel\n\nThe following race is possible between bpf_timer_cancel_and_free\nand bpf_timer_cancel. It will lead a UAF on the timer->timer.\n\nbpf_timer_cancel();\n\tspin_lock();\n\tt = timer->time;\n\tspin_unlock();\n\n\t\t\t\t\tbpf_timer_cancel_and_free();\n\t\t\t\t\t\tspin_lock();\n\t\t\t\t\t\tt = timer->timer;\n\t\t\t\t\t\ttimer->timer = NULL;\n\t\t\t\t\t\tspin_unlock();\n\t\t\t\t\t\thrtimer_cancel(&t->timer);\n\t\t\t\t\t\tkfree(t);\n\n\t/* UAF on t */\n\thrtimer_cancel(&t->timer);\n\nIn bpf_timer_cancel_and_free, this patch frees the timer->timer\nafter a rcu grace period. This requires a rcu_head addition\nto the \"struct bpf_hrtimer\". Another kfree(t) happens in bpf_timer_init,\nthis does not need a kfree_rcu because it is still under the\nspin_lock and timer->timer has not been visible by others yet.\n\nIn bpf_timer_cancel, rcu_read_lock() is added because this helper\ncan be used in a non rcu critical section context (e.g. from\na sleepable bpf prog). Other timer->timer usages in helpers.c\nhave been audited, bpf_timer_cancel() is the only place where\ntimer->timer is used outside of the spin_lock.\n\nAnother solution considered is to mark a t->flag in bpf_timer_cancel\nand clear it after hrtimer_cancel() is done.  In bpf_timer_cancel_and_free,\nit busy waits for the flag to be cleared before kfree(t). This patch\ngoes with a straight forward solution and frees timer->timer after\na rcu grace period."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/bpf/helpers.c"
                    ],
                    "versions": [
                        {
                            "version": "b00628b1c7d5",
                            "lessThan": "5268bb02107b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b00628b1c7d5",
                            "lessThan": "addf5e297e6c",
                            "status": "affected",
                            "versionType": "git"
                        },
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                            "version": "b00628b1c7d5",
                            "lessThan": "8327ed12e8eb",
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                        },
                        {
                            "version": "b00628b1c7d5",
                            "lessThan": "7d80a9e745fa",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b00628b1c7d5",
                            "lessThan": "0281b919e175",
                            "status": "affected",
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                        }
                    ]
                },
                {
                    "product": "Linux",
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/bpf/helpers.c"
                    ],
                    "versions": [
                        {
                            "version": "5.15",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.15",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.15.150",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "6.1.80",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "6.6.19",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
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                        },
                        {
                            "version": "6.7.7",
                            "lessThanOrEqual": "6.7.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "6.8",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/5268bb02107b9eedfdcd51db75b407d10043368c"
                },
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                },
                {
                    "url": "https://git.kernel.org/stable/c/0281b919e175bb9c3128bd3872ac2903e9436e3f"
                }
            ],
            "title": "bpf: Fix racing between bpf_timer_cancel_and_free and bpf_timer_cancel",
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                                "options": [
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                                        "Exploitation": "none"
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                                        "Technical Impact": "partial"
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                                "version": "2.0.3",
                                "timestamp": "2024-04-03T19:13:11.173900Z"
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                    "shortName": "CVE",
                    "dateUpdated": "2024-08-02T00:14:13.230Z"
                },
                "title": "CVE Program Container",
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