CVE-2022-50396
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net: sched: fix memory leak in tcindex_set_parms
Kernel uses tcindex_change() to change an existing filter properties.
Yet the problem is that, during the process of changing, if `old_r` is retrieved from `p->perfect`, then kernel uses tcindex_alloc_perfect_hash() to newly allocate filter results, uses tcindex_filter_result_init() to clear the old filter result, without destroying its tcf_exts structure, which triggers the above memory leak.
To be more specific, there are only two source for the `old_r`, according to the tcindex_lookup(). `old_r` is retrieved from `p->perfect`, or `old_r` is retrieved from `p->h`.
Leer descripción completaMostrar menos
* If `old_r` is retrieved from `p->perfect`, kernel uses tcindex_alloc_perfect_hash() to newly allocate the filter results. Then `r` is assigned with `cp->perfect + handle`, which is newly allocated. So condition `old_r && old_r != r` is true in this situation, and kernel uses tcindex_filter_result_init() to clear the old filter result, without destroying its tcf_exts structure
* If `old_r` is retrieved from `p->h`, then `p->perfect` is NULL according to the tcindex_lookup(). Considering that `cp->h` is directly copied from `p->h` and `p->perfect` is NULL, `r` is assigned with `tcindex_lookup(cp, handle)`, whose value should be the same as `old_r`, so condition `old_r && old_r != r` is false in this situation, kernel ignores using tcindex_filter_result_init() to clear the old filter result.
So only when `old_r` is retrieved from `p->perfect` does kernel use tcindex_filter_result_init() to clear the old filter result, which triggers the above memory leak.
Considering that there already exists a tc_filter_wq workqueue to destroy the old tcindex_d ---truncated---
Detalles técnicos trazas, registros y código del informe original
Syzkaller reports a memory leak as follows:
====================================
BUG: memory leak
unreferenced object 0xffff88810c287f00 (size 256):
comm "syz-executor105", pid 3600, jiffies 4294943292 (age 12.990s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff814cf9f0>] kmalloc_trace+0x20/0x90 mm/slab_common.c:1046
[<ffffffff839c9e07>] kmalloc include/linux/slab.h:576 [inline]
[<ffffffff839c9e07>] kmalloc_array include/linux/slab.h:627 [inline]
[<ffffffff839c9e07>] kcalloc include/linux/slab.h:659 [inline]
[<ffffffff839c9e07>] tcf_exts_init include/net/pkt_cls.h:250 [inline]
[<ffffffff839c9e07>] tcindex_set_parms+0xa7/0xbe0 net/sched/cls_tcindex.c:342
[<ffffffff839caa1f>] tcindex_change+0xdf/0x120 net/sched/cls_tcindex.c:553
[<ffffffff8394db62>] tc_new_tfilter+0x4f2/0x1100 net/sched/cls_api.c:2147
[<ffffffff8389e91c>] rtnetlink_rcv_msg+0x4dc/0x5d0 net/core/rtnetlink.c:6082
[<ffffffff839eba67>] netlink_rcv_skb+0x87/0x1d0 net/netlink/af_netlink.c:2540
[<ffffffff839eab87>] netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
[<ffffffff839eab87>] netlink_unicast+0x397/0x4c0 net/netlink/af_netlink.c:1345
[<ffffffff839eb046>] netlink_sendmsg+0x396/0x710 net/netlink/af_netlink.c:1921
[<ffffffff8383e796>] sock_sendmsg_nosec net/socket.c:714 [inline]
[<ffffffff8383e796>] sock_sendmsg+0x56/0x80 net/socket.c:734
[<ffffffff8383eb08>] ____sys_sendmsg+0x178/0x410 net/socket.c:2482
[<ffffffff83843678>] ___sys_sendmsg+0xa8/0x110 net/socket.c:2536
[<ffffffff838439c5>] __sys_sendmmsg+0x105/0x330 net/socket.c:2622
[<ffffffff83843c14>] __do_sys_sendmmsg net/socket.c:2651 [inline]
[<ffffffff83843c14>] __se_sys_sendmmsg net/socket.c:2648 [inline]
[<ffffffff83843c14>] __x64_sys_sendmmsg+0x24/0x30 net/socket.c:2648
[<ffffffff84605fd5>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
[<ffffffff84605fd5>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
[<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
====================================CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.17%
- Percentil entre todas las CVEs puntuadas: 6
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-401
- CWE-401
Referencias
- https://git.kernel.org/stable/c/01d0d2b8b4e3cf2110baba9371c0c3d04ad5c77b
- https://git.kernel.org/stable/c/18c3fa7a7fdbb4d21dafc8a7710ae2c1680930f6
- https://git.kernel.org/stable/c/372ae77cf11d11fb118cbe2d37def9dd5f826abd
- https://git.kernel.org/stable/c/399ab7fe0fa0d846881685fd4e57e9a8ef7559f7
- https://git.kernel.org/stable/c/3abebc503a5148072052c229c6b04b329a420ecd
- https://git.kernel.org/stable/c/53af9c793f644d5841d84d8e0ad83bd7ab47f3e0
- https://git.kernel.org/stable/c/55ac68b53f1cea1926ee2313afc5d66b91daad71
- https://git.kernel.org/stable/c/6c55953e232ea668731091d111066521f3b7719b
- https://git.kernel.org/stable/c/7a6fb69bbcb21e9ce13bdf18c008c268874f0480
- https://git.kernel.org/stable/c/7c183dc0af472dec33d2c0786a5e356baa8cad19
- https://git.kernel.org/stable/c/b314f6c3512108d7a656c5caf07c82d1bbbdc0f1
- https://git.kernel.org/stable/c/c4de6057e7c6654983acb63d939d26ac0d7bbf39
- https://git.kernel.org/stable/c/facc4405e8b7407e03216207b1d1d640127de0c8
JSON original (NVD)
Mostrar
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: fix memory leak in tcindex_set_parms\n\nSyzkaller reports a memory leak as follows:\n====================================\nBUG: memory leak\nunreferenced object 0xffff88810c287f00 (size 256):\n comm \"syz-executor105\", pid 3600, jiffies 4294943292 (age 12.990s)\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace:\n [<ffffffff814cf9f0>] kmalloc_trace+0x20/0x90 mm/slab_common.c:1046\n [<ffffffff839c9e07>] kmalloc include/linux/slab.h:576 [inline]\n [<ffffffff839c9e07>] kmalloc_array include/linux/slab.h:627 [inline]\n [<ffffffff839c9e07>] kcalloc include/linux/slab.h:659 [inline]\n [<ffffffff839c9e07>] tcf_exts_init include/net/pkt_cls.h:250 [inline]\n [<ffffffff839c9e07>] tcindex_set_parms+0xa7/0xbe0 net/sched/cls_tcindex.c:342\n [<ffffffff839caa1f>] tcindex_change+0xdf/0x120 net/sched/cls_tcindex.c:553\n [<ffffffff8394db62>] tc_new_tfilter+0x4f2/0x1100 net/sched/cls_api.c:2147\n [<ffffffff8389e91c>] rtnetlink_rcv_msg+0x4dc/0x5d0 net/core/rtnetlink.c:6082\n [<ffffffff839eba67>] netlink_rcv_skb+0x87/0x1d0 net/netlink/af_netlink.c:2540\n [<ffffffff839eab87>] netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]\n [<ffffffff839eab87>] netlink_unicast+0x397/0x4c0 net/netlink/af_netlink.c:1345\n [<ffffffff839eb046>] netlink_sendmsg+0x396/0x710 net/netlink/af_netlink.c:1921\n [<ffffffff8383e796>] sock_sendmsg_nosec net/socket.c:714 [inline]\n [<ffffffff8383e796>] sock_sendmsg+0x56/0x80 net/socket.c:734\n [<ffffffff8383eb08>] ____sys_sendmsg+0x178/0x410 net/socket.c:2482\n [<ffffffff83843678>] ___sys_sendmsg+0xa8/0x110 net/socket.c:2536\n [<ffffffff838439c5>] __sys_sendmmsg+0x105/0x330 net/socket.c:2622\n [<ffffffff83843c14>] __do_sys_sendmmsg net/socket.c:2651 [inline]\n [<ffffffff83843c14>] __se_sys_sendmmsg net/socket.c:2648 [inline]\n [<ffffffff83843c14>] __x64_sys_sendmmsg+0x24/0x30 net/socket.c:2648\n [<ffffffff84605fd5>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n [<ffffffff84605fd5>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n====================================\n\nKernel uses tcindex_change() to change an existing\nfilter properties.\n\nYet the problem is that, during the process of changing,\nif `old_r` is retrieved from `p->perfect`, then\nkernel uses tcindex_alloc_perfect_hash() to newly\nallocate filter results, uses tcindex_filter_result_init()\nto clear the old filter result, without destroying\nits tcf_exts structure, which triggers the above memory leak.\n\nTo be more specific, there are only two source for the `old_r`,\naccording to the tcindex_lookup(). `old_r` is retrieved from\n`p->perfect`, or `old_r` is retrieved from `p->h`.\n\n * If `old_r` is retrieved from `p->perfect`, kernel uses\ntcindex_alloc_perfect_hash() to newly allocate the\nfilter results. Then `r` is assigned with `cp->perfect + handle`,\nwhich is newly allocated. So condition `old_r && old_r != r` is\ntrue in this situation, and kernel uses tcindex_filter_result_init()\nto clear the old filter result, without destroying\nits tcf_exts structure\n\n * If `old_r` is retrieved from `p->h`, then `p->perfect` is NULL\naccording to the tcindex_lookup(). Considering that `cp->h`\nis directly copied from `p->h` and `p->perfect` is NULL,\n`r` is assigned with `tcindex_lookup(cp, handle)`, whose value\nshould be the same as `old_r`, so condition `old_r && old_r != r`\nis false in this situation, kernel ignores using\ntcindex_filter_result_init() to clear the old filter result.\n\nSo only when `old_r` is retrieved from `p->perfect` does kernel use\ntcindex_filter_result_init() to clear the old filter result, which\ntriggers the above memory leak.\n\nConsidering that there already exists a tc_filter_wq workqueue\nto destroy the old tcindex_d\n---truncated---"
}
],
"lastModified": "2026-06-17T05:23:26.860",
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