cve-2024-26737
Vulnerability from cvelistv5
Published
2024-04-03 17:00
Modified
2024-11-05 09:14
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
bpf: Fix racing between bpf_timer_cancel_and_free and bpf_timer_cancel
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0281b919e175bb9c3128bd3872ac2903e9436e3f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5268bb02107b9eedfdcd51db75b407d10043368c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d80a9e745fa5b47da3bca001f186c02485c7c33
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8327ed12e8ebc5436bfaa1786c49988894f9c8a6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/addf5e297e6cbf5341f9c07720693ca9ba0057b5
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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          "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-\u003etimer.\n\nbpf_timer_cancel();\n\tspin_lock();\n\tt = timer-\u003etime;\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-\u003etimer;\n\t\t\t\t\t\ttimer-\u003etimer = NULL;\n\t\t\t\t\t\tspin_unlock();\n\t\t\t\t\t\thrtimer_cancel(\u0026t-\u003etimer);\n\t\t\t\t\t\tkfree(t);\n\n\t/* UAF on t */\n\thrtimer_cancel(\u0026t-\u003etimer);\n\nIn bpf_timer_cancel_and_free, this patch frees the timer-\u003etimer\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-\u003etimer 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-\u003etimer usages in helpers.c\nhave been audited, bpf_timer_cancel() is the only place where\ntimer-\u003etimer is used outside of the spin_lock.\n\nAnother solution considered is to mark a t-\u003eflag 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-\u003etimer after\na rcu grace period."
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    "dateReserved": "2024-02-19T14:20:24.166Z",
    "dateUpdated": "2024-11-05T09:14:48.949Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26737\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-03T17:15:51.243\",\"lastModified\":\"2024-11-04T19:35:06.193\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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-\u003etimer.\\n\\nbpf_timer_cancel();\\n\\tspin_lock();\\n\\tt = timer-\u003etime;\\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-\u003etimer;\\n\\t\\t\\t\\t\\t\\ttimer-\u003etimer = NULL;\\n\\t\\t\\t\\t\\t\\tspin_unlock();\\n\\t\\t\\t\\t\\t\\thrtimer_cancel(\u0026t-\u003etimer);\\n\\t\\t\\t\\t\\t\\tkfree(t);\\n\\n\\t/* UAF on t */\\n\\thrtimer_cancel(\u0026t-\u003etimer);\\n\\nIn bpf_timer_cancel_and_free, this patch frees the timer-\u003etimer\\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-\u003etimer 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-\u003etimer usages in helpers.c\\nhave been audited, bpf_timer_cancel() is the only place where\\ntimer-\u003etimer is used outside of the spin_lock.\\n\\nAnother solution considered is to mark a t-\u003eflag 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-\u003etimer after\\na rcu grace period.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Correcci\u00f3n de ejecuci\u00f3ns entre bpf_timer_cancel_and_free y bpf_timer_cancel La siguiente ejecuci\u00f3n es posible entre bpf_timer_cancel_and_free y bpf_timer_cancel. Dirigir\u00e1 una UAF en el temporizador-\u0026gt;temporizador. bpf_timer_cancel(); spin_lock(); t = temporizador-\u0026gt;tiempo; spin_unlock(); bpf_timer_cancel_and_free(); spin_lock(); t = temporizador-\u0026gt;temporizador; temporizador-\u0026gt;temporizador = NULL; spin_unlock(); hrtimer_cancel(\u0026amp;t-\u0026gt;temporizador); klibre(t); /* UAF en t */ hrtimer_cancel(\u0026amp;t-\u0026gt;timer); En bpf_timer_cancel_and_free, este parche libera el temporizador-\u0026gt;temporizador despu\u00e9s de un per\u00edodo de gracia de rcu. 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}


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