CVE-2024-26625
Status: ModifiedHigh (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
llc: call sock_orphan() at release time
syzbot reported an interesting trace [1] caused by a stale sk->sk_wq pointer in a closed llc socket.
In commit ff7b11aa481f ("net: socket: set sock->sk to NULL after calling proto_ops::release()") Eric Biggers hinted that some protocols are missing a sock_orphan(), we need to perform a full audit.
In net-next, I plan to clear sock->sk from sock_orphan() and amend Eric patch to add a warning.
Technical details traces, logs and code from the original report
[1] BUG: KASAN: slab-use-after-free in list_empty include/linux/list.h:373 [inline] BUG: KASAN: slab-use-after-free in waitqueue_active include/linux/wait.h:127 [inline] BUG: KASAN: slab-use-after-free in sock_def_write_space_wfree net/core/sock.c:3384 [inline] BUG: KASAN: slab-use-after-free in sock_wfree+0x9a8/0x9d0 net/core/sock.c:2468 Read of size 8 at addr ffff88802f4fc880 by task ksoftirqd/1/27 CPU: 1 PID: 27 Comm: ksoftirqd/1 Not tainted 6.8.0-rc1-syzkaller-00049-g6098d87eaf31 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 list_empty include/linux/list.h:373 [inline] waitqueue_active include/linux/wait.h:127 [inline] sock_def_write_space_wfree net/core/sock.c:3384 [inline] sock_wfree+0x9a8/0x9d0 net/core/sock.c:2468 skb_release_head_state+0xa3/0x2b0 net/core/skbuff.c:1080 skb_release_all net/core/skbuff.c:1092 [inline] napi_consume_skb+0x119/0x2b0 net/core/skbuff.c:1404 e1000_unmap_and_free_tx_resource+0x144/0x200 drivers/net/ethernet/intel/e1000/e1000_main.c:1970 e1000_clean_tx_irq drivers/net/ethernet/intel/e1000/e1000_main.c:3860 [inline] e1000_clean+0x4a1/0x26e0 drivers/net/ethernet/intel/e1000/e1000_main.c:3801 __napi_poll.constprop.0+0xb4/0x540 net/core/dev.c:6576 napi_poll net/core/dev.c:6645 [inline] net_rx_action+0x956/0xe90 net/core/dev.c:6778 __do_softirq+0x21a/0x8de kernel/softirq.c:553 run_ksoftirqd kernel/softirq.c:921 [inline] run_ksoftirqd+0x31/0x60 kernel/softirq.c:913 smpboot_thread_fn+0x660/0xa10 kernel/smpboot.c:164 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 </TASK> Allocated by task 5167: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:314 [inline] __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:340 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc_lru+0x142/0x6f0 mm/slub.c:3879 alloc_inode_sb include/linux/fs.h:3019 [inline] sock_alloc_inode+0x25/0x1c0 net/socket.c:308 alloc_inode+0x5d/0x220 fs/inode.c:260 new_inode_pseudo+0x16/0x80 fs/inode.c:1005 sock_alloc+0x40/0x270 net/socket.c:634 __sock_create+0xbc/0x800 net/socket.c:1535 sock_create net/socket.c:1622 [inline] __sys_socket_create net/socket.c:1659 [inline] __sys_socket+0x14c/0x260 net/socket.c:1706 __do_sys_socket net/socket.c:1720 [inline] __se_sys_socket net/socket.c:1718 [inline] __x64_sys_socket+0x72/0xb0 net/socket.c:1718 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Freed by task 0: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:640 poison_slab_object mm/kasan/common.c:241 [inline] __kasan_slab_free+0x121/0x1b0 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inlin ---truncated---
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Base score: 7.8
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.25%
- Percentile among all scored CVEs: 15
- Score date: 10/8/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (2)
CWEs
- CWE-416
References
- https://git.kernel.org/stable/c/3151051b787f7cd7e3329ea0016eb9113c248812
- https://git.kernel.org/stable/c/64babb17e8150771c58575d8f93a35c5296b499f
- https://git.kernel.org/stable/c/6b950c712a9a05cdda4aea7fcb2848766576c11b
- https://git.kernel.org/stable/c/8e51f084b5716653f19e291ed5f026791d4b3ed4
- https://git.kernel.org/stable/c/9c333d9891f34cea8af1b229dc754552304c8eee
- https://git.kernel.org/stable/c/aa2b2eb3934859904c287bf5434647ba72e14c1c
- https://git.kernel.org/stable/c/d0b5b1f12429df3cd9751ab8b2f53729b77733b7
- https://git.kernel.org/stable/c/dbc1b89981f9c5360277071d33d7f04a43ffda4a
- https://git.kernel.org/stable/c/3151051b787f7cd7e3329ea0016eb9113c248812
- https://git.kernel.org/stable/c/64babb17e8150771c58575d8f93a35c5296b499f
- https://git.kernel.org/stable/c/6b950c712a9a05cdda4aea7fcb2848766576c11b
- https://git.kernel.org/stable/c/8e51f084b5716653f19e291ed5f026791d4b3ed4
- https://git.kernel.org/stable/c/9c333d9891f34cea8af1b229dc754552304c8eee
- https://git.kernel.org/stable/c/aa2b2eb3934859904c287bf5434647ba72e14c1c
- https://git.kernel.org/stable/c/d0b5b1f12429df3cd9751ab8b2f53729b77733b7
- https://git.kernel.org/stable/c/dbc1b89981f9c5360277071d33d7f04a43ffda4a
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Raw JSON (NVD)
Show
{
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nllc: call sock_orphan() at release time\n\nsyzbot reported an interesting trace [1] caused by a stale sk->sk_wq\npointer in a closed llc socket.\n\nIn commit ff7b11aa481f (\"net: socket: set sock->sk to NULL after\ncalling proto_ops::release()\") Eric Biggers hinted that some protocols\nare missing a sock_orphan(), we need to perform a full audit.\n\nIn net-next, I plan to clear sock->sk from sock_orphan() and\namend Eric patch to add a warning.\n\n[1]\n BUG: KASAN: slab-use-after-free in list_empty include/linux/list.h:373 [inline]\n BUG: KASAN: slab-use-after-free in waitqueue_active include/linux/wait.h:127 [inline]\n BUG: KASAN: slab-use-after-free in sock_def_write_space_wfree net/core/sock.c:3384 [inline]\n BUG: KASAN: slab-use-after-free in sock_wfree+0x9a8/0x9d0 net/core/sock.c:2468\nRead of size 8 at addr ffff88802f4fc880 by task ksoftirqd/1/27\n\nCPU: 1 PID: 27 Comm: ksoftirqd/1 Not tainted 6.8.0-rc1-syzkaller-00049-g6098d87eaf31 #0\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0xc4/0x620 mm/kasan/report.c:488\n kasan_report+0xda/0x110 mm/kasan/report.c:601\n list_empty include/linux/list.h:373 [inline]\n waitqueue_active include/linux/wait.h:127 [inline]\n sock_def_write_space_wfree net/core/sock.c:3384 [inline]\n sock_wfree+0x9a8/0x9d0 net/core/sock.c:2468\n skb_release_head_state+0xa3/0x2b0 net/core/skbuff.c:1080\n skb_release_all net/core/skbuff.c:1092 [inline]\n napi_consume_skb+0x119/0x2b0 net/core/skbuff.c:1404\n e1000_unmap_and_free_tx_resource+0x144/0x200 drivers/net/ethernet/intel/e1000/e1000_main.c:1970\n e1000_clean_tx_irq drivers/net/ethernet/intel/e1000/e1000_main.c:3860 [inline]\n e1000_clean+0x4a1/0x26e0 drivers/net/ethernet/intel/e1000/e1000_main.c:3801\n __napi_poll.constprop.0+0xb4/0x540 net/core/dev.c:6576\n napi_poll net/core/dev.c:6645 [inline]\n net_rx_action+0x956/0xe90 net/core/dev.c:6778\n __do_softirq+0x21a/0x8de kernel/softirq.c:553\n run_ksoftirqd kernel/softirq.c:921 [inline]\n run_ksoftirqd+0x31/0x60 kernel/softirq.c:913\n smpboot_thread_fn+0x660/0xa10 kernel/smpboot.c:164\n kthread+0x2c6/0x3a0 kernel/kthread.c:388\n ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242\n </TASK>\n\nAllocated by task 5167:\n kasan_save_stack+0x33/0x50 mm/kasan/common.c:47\n kasan_save_track+0x14/0x30 mm/kasan/common.c:68\n unpoison_slab_object mm/kasan/common.c:314 [inline]\n __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:340\n kasan_slab_alloc include/linux/kasan.h:201 [inline]\n slab_post_alloc_hook mm/slub.c:3813 [inline]\n slab_alloc_node mm/slub.c:3860 [inline]\n kmem_cache_alloc_lru+0x142/0x6f0 mm/slub.c:3879\n alloc_inode_sb include/linux/fs.h:3019 [inline]\n sock_alloc_inode+0x25/0x1c0 net/socket.c:308\n alloc_inode+0x5d/0x220 fs/inode.c:260\n new_inode_pseudo+0x16/0x80 fs/inode.c:1005\n sock_alloc+0x40/0x270 net/socket.c:634\n __sock_create+0xbc/0x800 net/socket.c:1535\n sock_create net/socket.c:1622 [inline]\n __sys_socket_create net/socket.c:1659 [inline]\n __sys_socket+0x14c/0x260 net/socket.c:1706\n __do_sys_socket net/socket.c:1720 [inline]\n __se_sys_socket net/socket.c:1718 [inline]\n __x64_sys_socket+0x72/0xb0 net/socket.c:1718\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nFreed by task 0:\n kasan_save_stack+0x33/0x50 mm/kasan/common.c:47\n kasan_save_track+0x14/0x30 mm/kasan/common.c:68\n kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:640\n poison_slab_object mm/kasan/common.c:241 [inline]\n __kasan_slab_free+0x121/0x1b0 mm/kasan/common.c:257\n kasan_slab_free include/linux/kasan.h:184 [inline]\n slab_free_hook mm/slub.c:2121 [inlin\n---truncated---"
},
{
"lang": "es",
"value": "En el kernel de Linux, se resolvió la siguiente vulnerabilidad: llc: llame a sock_orphan() en el momento del lanzamiento syzbot informó un rastro interesante [1] causado por un puntero sk->sk_wq obsoleto en un socket llc cerrado. En El commit ff7b11aa481f (\"net: socket: set sock->sk to NULL after call proto_ops::release()\") Eric Biggers insinuó que a algunos protocolos les falta un sock_orphan(), necesitamos realizar una auditoría completa. En net-next, planeo borrar sock->sk de sock_orphan() y modificar el parche de Eric para agregar una advertencia. [1] ERROR: KASAN: slab-use-after-free en list_empty include/linux/list.h:373 [en línea] ERROR: KASAN: slab-use-after-free en waitqueue_active include/linux/wait.h:127 [en línea] ERROR: KASAN: slab-use-after-free en sock_def_write_space_wfree net/core/sock.c:3384 [en línea] ERROR: KASAN: slab-use-after-free en sock_wfree+0x9a8/0x9d0 net/core/sock .c:2468 Lectura del tamaño 8 en la dirección ffff88802f4fc880 por tarea ksoftirqd/1/27 CPU: 1 PID: 27 Comm: ksoftirqd/1 Not tainted 6.8.0-rc1-syzkaller-00049-g6098d87eaf31 #0 Nombre de hardware: PC estándar QEMU (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 01/04/2014 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:88 [en línea] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack .c:106 print_address_description mm/kasan/report.c:377 [en línea] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 list_empty include/linux/ list.h:373 [en línea] waitqueue_active include/linux/wait.h:127 [en línea] sock_def_write_space_wfree net/core/sock.c:3384 [en línea] sock_wfree+0x9a8/0x9d0 net/core/sock.c:2468 skb_release_head_state+ 0xa3/0x2b0 net/core/skbuff.c:1080 skb_release_all net/core/skbuff.c:1092 [en línea] napi_consume_skb+0x119/0x2b0 net/core/skbuff.c:1404 e1000_unmap_and_free_tx_resource+0x144/0x200 drivers/net/ethernet/ intel/e1000/e1000_main.c:1970 e1000_clean_tx_irq controladores/net/ethernet/intel/e1000/e1000_main.c:3860 [en línea] e1000_clean+0x4a1/0x26e0 controladores/net/ethernet/intel/e1000/e1000_main.c:3801 __ napi_poll. constprop.0+0xb4/0x540 net/core/dev.c:6576 napi_poll net/core/dev.c:6645 [en línea] net_rx_action+0x956/0xe90 net/core/dev.c:6778 __do_softirq+0x21a/0x8de kernel/ softirq.c:553 run_ksoftirqd kernel/softirq.c:921 [en línea] run_ksoftirqd+0x31/0x60 kernel/softirq.c:913 smpboot_thread_fn+0x660/0xa10 kernel/smpboot.c:164 kthread+0x2c6/0x3a0 kernel/kthread.c :388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Asignado por tarea 5167: kasan_save_stack+0x33/0x50 mm/ kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:314 [en línea] __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:340 kasan_slab_alloc incluir /linux/kasan.h:201 [en línea] slab_post_alloc_hook mm/slub.c:3813 [en línea] slab_alloc_node mm/slub.c:3860 [en línea] kmem_cache_alloc_lru+0x142/0x6f0 mm/slub.c:3879 alloc_inode_sb include/linux/ fs.h:3019 [en línea] sock_alloc_inode+0x25/0x1c0 net/socket.c:308 alloc_inode+0x5d/0x220 fs/inode.c:260 new_inode_pseudo+0x16/0x80 fs/inode.c:1005 sock_alloc+0x40/0x270 net /socket.c:634 __sock_create+0xbc/0x800 net/socket.c:1535 sock_create net/socket.c:1622 [en línea] __sys_socket_create net/socket.c:1659 [en línea] __sys_socket+0x14c/0x260 net/socket.c :1706 __do_sys_socket net/socket.c:1720 [en línea] __se_sys_socket net/socket.c:1718 [en línea] __x64_sys_socket+0x72/0xb0 net/socket.c:1718 do_syscall_x64 arch/x86/entry/common.c:52 [en línea ] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 Entry_SYSCALL_64_after_hwframe+0x63/0x6b Liberado por la tarea 0: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/ common.c:68 kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:640 veneno_slab_object mm/kasan/common.c:241 [en línea] __kasan_slab_free+0x121/0x1b0 mm/kasan/common.c:257 kasan_slab_free include/linux /kasan.h:184 [en línea] slab_free_hook mm/slub.c:2121 [en línea ---truncado---"
}
],
"lastModified": "2026-08-04T11:16:49.980",
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