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CVE-2026-97958

Estado: RecibidaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

net/sched: cls_api: Don't replay RTM_GETCHAIN in tc_ctl_chain().

If a netlink socket sends RTM_GETCHAIN requests repeatedly without recv()ing the responses, tc_ctl_chain() hogs CPU and triggers Hung Task splat. [0]

As caught in the stack trace, netlink_attachskb() could confuse tc_ctl_chain() by returning -EAGAIN when the userspace netlink socket's receive buffer is full.

The replay: label exists since commit 32a4f5ecd738 ("net: sched: introduce chain object to uapi") but was not used initially.

Since commit 9f407f1768d3 ("net: sched: introduce chain templates"), the label is needed for RTM_NEWCHAIN because tcf_proto_lookup_ops() may release RTNL to call request_module().

Leer descripción completaMostrar menos

However, the replay logic is unnecessary for RTM_GETCHAIN.

Let's apply the replay logic only for RTM_NEWCHAIN.

Detalles técnicos trazas, registros y código del informe original
[0]:
INFO: task repro:1018 is blocked on a mutex likely owned by task repro:1022.
task:repro           state:R  running task     stack:14096 pid:1022  tgid:1014  ppid:961    task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 ? clockevents_program_event (kernel/time/clockevents.c:372)
 ? pskb_expand_head (net/core/skbuff.c:615)
 ? skb_release_data (net/core/skbuff.c:1122)
 ? netlink_attachskb (./include/linux/skbuff.h:1323 ./include/linux/skbuff.h:1332 net/netlink/af_netlink.c:1232)
 ? __netlink_lookup (./include/linux/rcupdate.h:882 ./include/linux/rhashtable.h:711 net/netlink/af_netlink.c:499)
 ? tc_chain_notify (net/sched/cls_api.c:3045)
 ? tc_chain_notify (./include/linux/skbuff.h:1384 net/sched/cls_api.c:3041)
 ? netlink_unicast (net/netlink/af_netlink.c:1335)
 ? rtnl_unicast (./include/net/netlink.h:1198 net/core/rtnetlink.c:985)
 ? tc_ctl_chain (net/sched/cls_api.c:3242)
 ? rtnetlink_rcv_msg (net/core/rtnetlink.c:7146)
 ? netlink_unicast (net/netlink/af_netlink.c:1354)
 ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:7177)
 ? netlink_rcv_skb (net/netlink/af_netlink.c:2556)
 ? netlink_unicast (net/netlink/af_netlink.c:1319)
 ? netlink_sendmsg (net/netlink/af_netlink.c:1900)
 ? __sock_sendmsg (net/socket.c:800)
 ? __sys_sendto (net/socket.c:2281)
 ? __x64_sys_sendto (net/socket.c:2288 net/socket.c:2284 net/socket.c:2284)
 ? do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)
 ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
 </TASK>

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

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)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-97958",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2ed9db3074fcd8d12709fe40ff0e691d74229818",
              "lessThan": "240251a4ca7cda213103694b6e21c4a5745e5d8b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2ed9db3074fcd8d12709fe40ff0e691d74229818",
              "lessThan": "9a0f07f7dbd1bfe8c2fd03ad055e9e60a703d5df",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2ed9db3074fcd8d12709fe40ff0e691d74229818",
              "lessThan": "6558b0d46c5941ed1aa67da8878e224c54239cc5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2ed9db3074fcd8d12709fe40ff0e691d74229818",
              "lessThan": "96c2fc5daf983af2e0c1256c31e89c1f3f855279",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2ed9db3074fcd8d12709fe40ff0e691d74229818",
              "lessThan": "a1c2840d95af1fa3d83ba71e23fa0c674a4c6796",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2ed9db3074fcd8d12709fe40ff0e691d74229818",
              "lessThan": "503ba58481e3ba69d28127d35a39cec529f9670c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2ed9db3074fcd8d12709fe40ff0e691d74229818",
              "lessThan": "e9ac395bb56122a057d0aa91a6b55d9e3fa37c26",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2ed9db3074fcd8d12709fe40ff0e691d74229818",
              "lessThan": "dff39930ad5e53d202bfdfb14687d1d2fd753b4d",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/sched/cls_api.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/sched/cls_api.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-25T11:17:23.477",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/240251a4ca7cda213103694b6e21c4a5745e5d8b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/503ba58481e3ba69d28127d35a39cec529f9670c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6558b0d46c5941ed1aa67da8878e224c54239cc5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/96c2fc5daf983af2e0c1256c31e89c1f3f855279",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9a0f07f7dbd1bfe8c2fd03ad055e9e60a703d5df",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a1c2840d95af1fa3d83ba71e23fa0c674a4c6796",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dff39930ad5e53d202bfdfb14687d1d2fd753b4d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e9ac395bb56122a057d0aa91a6b55d9e3fa37c26",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: Don't replay RTM_GETCHAIN in tc_ctl_chain().\n\nIf a netlink socket sends RTM_GETCHAIN requests repeatedly\nwithout recv()ing the responses, tc_ctl_chain() hogs CPU and\ntriggers Hung Task splat. [0]\n\nAs caught in the stack trace, netlink_attachskb() could confuse\ntc_ctl_chain() by returning -EAGAIN when the userspace netlink\nsocket's receive buffer is full.\n\nThe replay: label exists since commit 32a4f5ecd738 (\"net: sched:\nintroduce chain object to uapi\") but was not used initially.\n\nSince commit 9f407f1768d3 (\"net: sched: introduce chain templates\"),\nthe label is needed for RTM_NEWCHAIN because tcf_proto_lookup_ops()\nmay release RTNL to call request_module().\n\nHowever, the replay logic is unnecessary for RTM_GETCHAIN.\n\nLet's apply the replay logic only for RTM_NEWCHAIN.\n\n[0]:\nINFO: task repro:1018 is blocked on a mutex likely owned by task repro:1022.\ntask:repro           state:R  running task     stack:14096 pid:1022  tgid:1014  ppid:961    task_flags:0x400040 flags:0x00080000\nCall Trace:\n <TASK>\n ? clockevents_program_event (kernel/time/clockevents.c:372)\n ? pskb_expand_head (net/core/skbuff.c:615)\n ? skb_release_data (net/core/skbuff.c:1122)\n ? netlink_attachskb (./include/linux/skbuff.h:1323 ./include/linux/skbuff.h:1332 net/netlink/af_netlink.c:1232)\n ? __netlink_lookup (./include/linux/rcupdate.h:882 ./include/linux/rhashtable.h:711 net/netlink/af_netlink.c:499)\n ? tc_chain_notify (net/sched/cls_api.c:3045)\n ? tc_chain_notify (./include/linux/skbuff.h:1384 net/sched/cls_api.c:3041)\n ? netlink_unicast (net/netlink/af_netlink.c:1335)\n ? rtnl_unicast (./include/net/netlink.h:1198 net/core/rtnetlink.c:985)\n ? tc_ctl_chain (net/sched/cls_api.c:3242)\n ? rtnetlink_rcv_msg (net/core/rtnetlink.c:7146)\n ? netlink_unicast (net/netlink/af_netlink.c:1354)\n ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:7177)\n ? netlink_rcv_skb (net/netlink/af_netlink.c:2556)\n ? netlink_unicast (net/netlink/af_netlink.c:1319)\n ? netlink_sendmsg (net/netlink/af_netlink.c:1900)\n ? __sock_sendmsg (net/socket.c:800)\n ? __sys_sendto (net/socket.c:2281)\n ? __x64_sys_sendto (net/socket.c:2288 net/socket.c:2284 net/socket.c:2284)\n ? do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)\n ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n </TASK>"
    }
  ],
  "lastModified": "2026-10-03T11:18:20.930",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}