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CVE-2024-50039 (GCVE-0-2024-50039)

Vulnerability from cvelistv5 – Published: 2024-10-21 19:39 – Updated: 2026-08-05 11:41
VLAI
Title
net/sched: accept TCA_STAB only for root qdisc
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: accept TCA_STAB only for root qdisc Most qdiscs maintain their backlog using qdisc_pkt_len(skb) on the assumption it is invariant between the enqueue() and dequeue() handlers. Unfortunately syzbot can crash a host rather easily using a TBF + SFQ combination, with an STAB on SFQ [1] We can't support TCA_STAB on arbitrary level, this would require to maintain per-qdisc storage. [1] [ 88.796496] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 88.798611] #PF: supervisor read access in kernel mode [ 88.799014] #PF: error_code(0x0000) - not-present page [ 88.799506] PGD 0 P4D 0 [ 88.799829] Oops: Oops: 0000 [#1] SMP NOPTI [ 88.800569] CPU: 14 UID: 0 PID: 2053 Comm: b371744477 Not tainted 6.12.0-rc1-virtme #1117 [ 88.801107] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 88.801779] RIP: 0010:sfq_dequeue (net/sched/sch_sfq.c:272 net/sched/sch_sfq.c:499) sch_sfq [ 88.802544] Code: 0f b7 50 12 48 8d 04 d5 00 00 00 00 48 89 d6 48 29 d0 48 8b 91 c0 01 00 00 48 c1 e0 03 48 01 c2 66 83 7a 1a 00 7e c0 48 8b 3a <4c> 8b 07 4c 89 02 49 89 50 08 48 c7 47 08 00 00 00 00 48 c7 07 00 All code ======== 0: 0f b7 50 12 movzwl 0x12(%rax),%edx 4: 48 8d 04 d5 00 00 00 lea 0x0(,%rdx,8),%rax b: 00 c: 48 89 d6 mov %rdx,%rsi f: 48 29 d0 sub %rdx,%rax 12: 48 8b 91 c0 01 00 00 mov 0x1c0(%rcx),%rdx 19: 48 c1 e0 03 shl $0x3,%rax 1d: 48 01 c2 add %rax,%rdx 20: 66 83 7a 1a 00 cmpw $0x0,0x1a(%rdx) 25: 7e c0 jle 0xffffffffffffffe7 27: 48 8b 3a mov (%rdx),%rdi 2a:* 4c 8b 07 mov (%rdi),%r8 <-- trapping instruction 2d: 4c 89 02 mov %r8,(%rdx) 30: 49 89 50 08 mov %rdx,0x8(%r8) 34: 48 c7 47 08 00 00 00 movq $0x0,0x8(%rdi) 3b: 00 3c: 48 rex.W 3d: c7 .byte 0xc7 3e: 07 (bad) ... Code starting with the faulting instruction =========================================== 0: 4c 8b 07 mov (%rdi),%r8 3: 4c 89 02 mov %r8,(%rdx) 6: 49 89 50 08 mov %rdx,0x8(%r8) a: 48 c7 47 08 00 00 00 movq $0x0,0x8(%rdi) 11: 00 12: 48 rex.W 13: c7 .byte 0xc7 14: 07 (bad) ... [ 88.803721] RSP: 0018:ffff9a1f892b7d58 EFLAGS: 00000206 [ 88.804032] RAX: 0000000000000000 RBX: ffff9a1f8420c800 RCX: ffff9a1f8420c800 [ 88.804560] RDX: ffff9a1f81bc1440 RSI: 0000000000000000 RDI: 0000000000000000 [ 88.805056] RBP: ffffffffc04bb0e0 R08: 0000000000000001 R09: 00000000ff7f9a1f [ 88.805473] R10: 000000000001001b R11: 0000000000009a1f R12: 0000000000000140 [ 88.806194] R13: 0000000000000001 R14: ffff9a1f886df400 R15: ffff9a1f886df4ac [ 88.806734] FS: 00007f445601a740(0000) GS:ffff9a2e7fd80000(0000) knlGS:0000000000000000 [ 88.807225] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 88.807672] CR2: 0000000000000000 CR3: 000000050cc46000 CR4: 00000000000006f0 [ 88.808165] Call Trace: [ 88.808459] <TASK> [ 88.808710] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) [ 88.809261] ? page_fault_oops (arch/x86/mm/fault.c:715) [ 88.809561] ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:87 ./arch/x86/include/asm/irqflags.h:147 arch/x86/mm/fault.c:1489 arch/x86/mm/fault.c:1539) [ 88.809806] ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623) [ 88.810074] ? sfq_dequeue (net/sched/sch_sfq.c:272 net/sched/sch_sfq.c:499) sch_sfq [ 88.810411] sfq_reset (net/sched/sch_sfq.c:525) sch_sfq [ 88.810671] qdisc_reset (./include/linux/skbuff.h:2135 ./include/linux/skbuff.h:2441 ./include/linux/skbuff.h:3304 ./include/linux/skbuff.h:3310 net/sched/sch_g ---truncated---
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:25 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 175f9c1bba9b825d22b142d183c9e175488b260c , < 2acbb9539bc2284e30d2aeb789c3d96287014264 (git)
Affected: 175f9c1bba9b825d22b142d183c9e175488b260c , < adbc3eef43fc94c7c8436da832691ae02333a972 (git)
Affected: 175f9c1bba9b825d22b142d183c9e175488b260c , < 8fb6503592d39065316f45d267c5527b4e7cd995 (git)
Affected: 175f9c1bba9b825d22b142d183c9e175488b260c , < 76feedc74b90270390fbfdf74a2e944e96872363 (git)
Affected: 175f9c1bba9b825d22b142d183c9e175488b260c , < 1edf039ee01788ffc25625fe58a903ae2efa213e (git)
Affected: 175f9c1bba9b825d22b142d183c9e175488b260c , < 3dc6ee96473cc2962c6db4297d4631f261be150f (git)
Affected: 175f9c1bba9b825d22b142d183c9e175488b260c , < 3cb7cf1540ddff5473d6baeb530228d19bc97b8a (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 5.4.285 , ≤ 5.4.* (semver)
Unaffected: 5.10.227 , ≤ 5.10.* (semver)
Unaffected: 5.15.168 , ≤ 5.15.* (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.57 , ≤ 6.6.* (semver)
Unaffected: 6.11.4 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens RUGGEDCOM RST2428P Affected: 0 , < V3.2 (custom)
guessed Create a notification for this product.
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Affected: 0 , < V3.2 (custom)
guessed Create a notification for this product.
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Affected: 0 , < V3.2 (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: accept TCA_STAB only for root qdisc\n\nMost qdiscs maintain their backlog using qdisc_pkt_len(skb)\non the assumption it is invariant between the enqueue()\nand dequeue() handlers.\n\nUnfortunately syzbot can crash a host rather easily using\na TBF + SFQ combination, with an STAB on SFQ [1]\n\nWe can\u0027t support TCA_STAB on arbitrary level, this would\nrequire to maintain per-qdisc storage.\n\n[1]\n[   88.796496] BUG: kernel NULL pointer dereference, address: 0000000000000000\n[   88.798611] #PF: supervisor read access in kernel mode\n[   88.799014] #PF: error_code(0x0000) - not-present page\n[   88.799506] PGD 0 P4D 0\n[   88.799829] Oops: Oops: 0000 [#1] SMP NOPTI\n[   88.800569] CPU: 14 UID: 0 PID: 2053 Comm: b371744477 Not tainted 6.12.0-rc1-virtme #1117\n[   88.801107] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   88.801779] RIP: 0010:sfq_dequeue (net/sched/sch_sfq.c:272 net/sched/sch_sfq.c:499) sch_sfq\n[ 88.802544] Code: 0f b7 50 12 48 8d 04 d5 00 00 00 00 48 89 d6 48 29 d0 48 8b 91 c0 01 00 00 48 c1 e0 03 48 01 c2 66 83 7a 1a 00 7e c0 48 8b 3a \u003c4c\u003e 8b 07 4c 89 02 49 89 50 08 48 c7 47 08 00 00 00 00 48 c7 07 00\nAll code\n========\n   0:\t0f b7 50 12          \tmovzwl 0x12(%rax),%edx\n   4:\t48 8d 04 d5 00 00 00 \tlea    0x0(,%rdx,8),%rax\n   b:\t00\n   c:\t48 89 d6             \tmov    %rdx,%rsi\n   f:\t48 29 d0             \tsub    %rdx,%rax\n  12:\t48 8b 91 c0 01 00 00 \tmov    0x1c0(%rcx),%rdx\n  19:\t48 c1 e0 03          \tshl    $0x3,%rax\n  1d:\t48 01 c2             \tadd    %rax,%rdx\n  20:\t66 83 7a 1a 00       \tcmpw   $0x0,0x1a(%rdx)\n  25:\t7e c0                \tjle    0xffffffffffffffe7\n  27:\t48 8b 3a             \tmov    (%rdx),%rdi\n  2a:*\t4c 8b 07             \tmov    (%rdi),%r8\t\t\u003c-- trapping instruction\n  2d:\t4c 89 02             \tmov    %r8,(%rdx)\n  30:\t49 89 50 08          \tmov    %rdx,0x8(%r8)\n  34:\t48 c7 47 08 00 00 00 \tmovq   $0x0,0x8(%rdi)\n  3b:\t00\n  3c:\t48                   \trex.W\n  3d:\tc7                   \t.byte 0xc7\n  3e:\t07                   \t(bad)\n\t...\n\nCode starting with the faulting instruction\n===========================================\n   0:\t4c 8b 07             \tmov    (%rdi),%r8\n   3:\t4c 89 02             \tmov    %r8,(%rdx)\n   6:\t49 89 50 08          \tmov    %rdx,0x8(%r8)\n   a:\t48 c7 47 08 00 00 00 \tmovq   $0x0,0x8(%rdi)\n  11:\t00\n  12:\t48                   \trex.W\n  13:\tc7                   \t.byte 0xc7\n  14:\t07                   \t(bad)\n\t...\n[   88.803721] RSP: 0018:ffff9a1f892b7d58 EFLAGS: 00000206\n[   88.804032] RAX: 0000000000000000 RBX: ffff9a1f8420c800 RCX: ffff9a1f8420c800\n[   88.804560] RDX: ffff9a1f81bc1440 RSI: 0000000000000000 RDI: 0000000000000000\n[   88.805056] RBP: ffffffffc04bb0e0 R08: 0000000000000001 R09: 00000000ff7f9a1f\n[   88.805473] R10: 000000000001001b R11: 0000000000009a1f R12: 0000000000000140\n[   88.806194] R13: 0000000000000001 R14: ffff9a1f886df400 R15: ffff9a1f886df4ac\n[   88.806734] FS:  00007f445601a740(0000) GS:ffff9a2e7fd80000(0000) knlGS:0000000000000000\n[   88.807225] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[   88.807672] CR2: 0000000000000000 CR3: 000000050cc46000 CR4: 00000000000006f0\n[   88.808165] Call Trace:\n[   88.808459]  \u003cTASK\u003e\n[   88.808710] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434)\n[   88.809261] ? page_fault_oops (arch/x86/mm/fault.c:715)\n[   88.809561] ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:87 ./arch/x86/include/asm/irqflags.h:147 arch/x86/mm/fault.c:1489 arch/x86/mm/fault.c:1539)\n[   88.809806] ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623)\n[   88.810074] ? sfq_dequeue (net/sched/sch_sfq.c:272 net/sched/sch_sfq.c:499) sch_sfq\n[   88.810411] sfq_reset (net/sched/sch_sfq.c:525) sch_sfq\n[   88.810671] qdisc_reset (./include/linux/skbuff.h:2135 ./include/linux/skbuff.h:2441 ./include/linux/skbuff.h:3304 ./include/linux/skbuff.h:3310 net/sched/sch_g\n---truncated---"
        }
      ],
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            {
              "lang": "en",
              "value": "AV:L - The vulnerability is configured and triggered through the rtnetlink `RTM_NEWQDISC` interface (tc qdisc) plus locally generated traffic on a local netdevice, requiring local system access. Per kernel scoring guidance, tc/netlink qdisc bugs are Local.\nAC:L - The attacker fully controls both the qdisc hierarchy (TBF root + SFQ child with TCA_STAB) and the traffic that drives the enqueue/peek/dequeue accounting desync, and syzbot produced a reliable reproducer. No condition outside attacker control is needed.\nPR:L - The netlink path requires CAP_NET_ADMIN only in the network namespace\u0027s user_ns (`netlink_net_capable`), which an unprivileged user obtains with `unshare -Urn`; qdiscs, veth/lo and the size table are all configurable inside that namespace.\nUI:N - The attacker performs every step \u2014 creating the netns, grafting the qdiscs with the size table, and sending the packets. No victim action is involved.\nS:U - The corruption occurs in kernel heap memory managed by the same kernel security authority; there is no VM, IOMMU, or hypervisor boundary crossed.\nC:H - `sfq_dec()` underflows the u16 `slot-\u003eqlen` to 65535, making `sfq_link()` read `q-\u003edep[65535]` hundreds of kilobytes out of bounds, and a `struct sfq_slot` is returned as a fake `sk_buff` whose fields are read as `pkt_len`/`head`/`destructor` \u2014 both give attacker-leverageable kernel memory disclosure.\nI:H - The same underflow yields out-of-bounds writes (`q-\u003edep[65535].next = x` and `sfq_dep_head(q, n)-\u003eprev = x` with an OOB-derived index), and the type-confused fake skb is passed to `rtnl_kfree_skbs()`/`kfree_skb()`, freeing a pointer into the middle of a kvmalloc\u0027ed array \u2014 a heap-corruption/control-flow-hijack primitive.\nA:H - The reported syzbot crash is an immediate kernel NULL pointer dereference oops in `sfq_dequeue()` during qdisc reset, reproducible on demand by any local user with a user namespace."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:41:10.785Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2acbb9539bc2284e30d2aeb789c3d96287014264"
        },
        {
          "url": "https://git.kernel.org/stable/c/adbc3eef43fc94c7c8436da832691ae02333a972"
        },
        {
          "url": "https://git.kernel.org/stable/c/8fb6503592d39065316f45d267c5527b4e7cd995"
        },
        {
          "url": "https://git.kernel.org/stable/c/76feedc74b90270390fbfdf74a2e944e96872363"
        },
        {
          "url": "https://git.kernel.org/stable/c/1edf039ee01788ffc25625fe58a903ae2efa213e"
        },
        {
          "url": "https://git.kernel.org/stable/c/3dc6ee96473cc2962c6db4297d4631f261be150f"
        },
        {
          "url": "https://git.kernel.org/stable/c/3cb7cf1540ddff5473d6baeb530228d19bc97b8a"
        }
      ],
      "title": "net/sched: accept TCA_STAB only for root qdisc",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50039",
    "datePublished": "2024-10-21T19:39:39.115Z",
    "dateReserved": "2024-10-21T12:17:06.070Z",
    "dateUpdated": "2026-08-05T11:41:10.785Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-50039",
      "date": "2026-09-13",
      "epss": "0.00254",
      "percentile": "0.17017"
    },
    "microsoft_vex": {
      "current_release_date": "2026-02-18T02:29:15.000Z",
      "cve": "CVE-2024-50039",
      "id": "msrc_CVE-2024-50039",
      "initial_release_date": "2024-10-01T07:00:00.000Z",
      "product_status:fixed": "5",
      "product_status:known_affected": "5",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/sched: accept TCA_STAB only for root qdisc",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-50039.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-50039\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T20:15:16.957\",\"lastModified\":\"2026-08-04T11:21:10.813\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/sched: accept TCA_STAB only for root qdisc\\n\\nMost qdiscs maintain their backlog using qdisc_pkt_len(skb)\\non the assumption it is invariant between the enqueue()\\nand dequeue() handlers.\\n\\nUnfortunately syzbot can crash a host rather easily using\\na TBF + SFQ combination, with an STAB on SFQ [1]\\n\\nWe can\u0027t support TCA_STAB on arbitrary level, this would\\nrequire to maintain per-qdisc storage.\\n\\n[1]\\n[   88.796496] BUG: kernel NULL pointer dereference, address: 0000000000000000\\n[   88.798611] #PF: supervisor read access in kernel mode\\n[   88.799014] #PF: error_code(0x0000) - not-present page\\n[   88.799506] PGD 0 P4D 0\\n[   88.799829] Oops: Oops: 0000 [#1] SMP NOPTI\\n[   88.800569] CPU: 14 UID: 0 PID: 2053 Comm: b371744477 Not tainted 6.12.0-rc1-virtme #1117\\n[   88.801107] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\n[   88.801779] RIP: 0010:sfq_dequeue (net/sched/sch_sfq.c:272 net/sched/sch_sfq.c:499) sch_sfq\\n[ 88.802544] Code: 0f b7 50 12 48 8d 04 d5 00 00 00 00 48 89 d6 48 29 d0 48 8b 91 c0 01 00 00 48 c1 e0 03 48 01 c2 66 83 7a 1a 00 7e c0 48 8b 3a \u003c4c\u003e 8b 07 4c 89 02 49 89 50 08 48 c7 47 08 00 00 00 00 48 c7 07 00\\nAll code\\n========\\n   0:\\t0f b7 50 12          \\tmovzwl 0x12(%rax),%edx\\n   4:\\t48 8d 04 d5 00 00 00 \\tlea    0x0(,%rdx,8),%rax\\n   b:\\t00\\n   c:\\t48 89 d6             \\tmov    %rdx,%rsi\\n   f:\\t48 29 d0             \\tsub    %rdx,%rax\\n  12:\\t48 8b 91 c0 01 00 00 \\tmov    0x1c0(%rcx),%rdx\\n  19:\\t48 c1 e0 03          \\tshl    $0x3,%rax\\n  1d:\\t48 01 c2             \\tadd    %rax,%rdx\\n  20:\\t66 83 7a 1a 00       \\tcmpw   $0x0,0x1a(%rdx)\\n  25:\\t7e c0                \\tjle    0xffffffffffffffe7\\n  27:\\t48 8b 3a             \\tmov    (%rdx),%rdi\\n  2a:*\\t4c 8b 07             \\tmov    (%rdi),%r8\\t\\t\u003c-- trapping instruction\\n  2d:\\t4c 89 02             \\tmov    %r8,(%rdx)\\n  30:\\t49 89 50 08          \\tmov    %rdx,0x8(%r8)\\n  34:\\t48 c7 47 08 00 00 00 \\tmovq   $0x0,0x8(%rdi)\\n  3b:\\t00\\n  3c:\\t48                   \\trex.W\\n  3d:\\tc7                   \\t.byte 0xc7\\n  3e:\\t07                   \\t(bad)\\n\\t...\\n\\nCode starting with the faulting instruction\\n===========================================\\n   0:\\t4c 8b 07             \\tmov    (%rdi),%r8\\n   3:\\t4c 89 02             \\tmov    %r8,(%rdx)\\n   6:\\t49 89 50 08          \\tmov    %rdx,0x8(%r8)\\n   a:\\t48 c7 47 08 00 00 00 \\tmovq   $0x0,0x8(%rdi)\\n  11:\\t00\\n  12:\\t48                   \\trex.W\\n  13:\\tc7                   \\t.byte 0xc7\\n  14:\\t07                   \\t(bad)\\n\\t...\\n[   88.803721] RSP: 0018:ffff9a1f892b7d58 EFLAGS: 00000206\\n[   88.804032] RAX: 0000000000000000 RBX: ffff9a1f8420c800 RCX: ffff9a1f8420c800\\n[   88.804560] RDX: ffff9a1f81bc1440 RSI: 0000000000000000 RDI: 0000000000000000\\n[   88.805056] RBP: ffffffffc04bb0e0 R08: 0000000000000001 R09: 00000000ff7f9a1f\\n[   88.805473] R10: 000000000001001b R11: 0000000000009a1f R12: 0000000000000140\\n[   88.806194] R13: 0000000000000001 R14: ffff9a1f886df400 R15: ffff9a1f886df4ac\\n[   88.806734] FS:  00007f445601a740(0000) GS:ffff9a2e7fd80000(0000) knlGS:0000000000000000\\n[   88.807225] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[   88.807672] CR2: 0000000000000000 CR3: 000000050cc46000 CR4: 00000000000006f0\\n[   88.808165] Call Trace:\\n[   88.808459]  \u003cTASK\u003e\\n[   88.808710] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434)\\n[   88.809261] ? page_fault_oops (arch/x86/mm/fault.c:715)\\n[   88.809561] ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:87 ./arch/x86/include/asm/irqflags.h:147 arch/x86/mm/fault.c:1489 arch/x86/mm/fault.c:1539)\\n[   88.809806] ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623)\\n[   88.810074] ? sfq_dequeue (net/sched/sch_sfq.c:272 net/sched/sch_sfq.c:499) sch_sfq\\n[   88.810411] sfq_reset (net/sched/sch_sfq.c:525) sch_sfq\\n[   88.810671] qdisc_reset (./include/linux/skbuff.h:2135 ./include/linux/skbuff.h:2441 ./include/linux/skbuff.h:3304 ./include/linux/skbuff.h:3310 net/sched/sch_g\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: acepta TCA_STAB solo para qdisc ra\u00edz La mayor\u00eda de las qdisc mantienen su lista de espera utilizando qdisc_pkt_len(skb) asumiendo que es invariable entre los controladores enqueue() y dequeue(). Desafortunadamente, syzbot puede hacer que un host se bloquee con bastante facilidad utilizando una combinaci\u00f3n TBF + SFQ, con un STAB en SFQ [1] No podemos admitir TCA_STAB en un nivel arbitrario, esto requerir\u00eda mantener el almacenamiento por qdisc. [1] [ 88.796496] ERROR: desreferencia de puntero NULL del n\u00facleo, direcci\u00f3n: 0000000000000000 [ 88.798611] #PF: acceso de lectura del supervisor en modo n\u00facleo [ 88.799014] #PF: error_code(0x0000) - p\u00e1gina no presente [ 88.799506] PGD 0 P4D 0 [ 88.799829] Oops: Oops: 0000 [#1] SMP NOPTI [ 88.800569] CPU: 14 UID: 0 PID: 2053 Comm: b371744477 No contaminado 6.12.0-rc1-virtme #1117 [ 88.801107] Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 01/04/2014 [ 88.801779] RIP: 0010:sfq_dequeue (net/sched/sch_sfq.c:272 net/sched/sch_sfq.c:499) sch_sfq [ 88.802544] C\u00f3digo: 0f b7 50 12 48 8d 04 d5 00 00 00 00 48 89 d6 48 29 d0 48 8b 91 c0 01 00 00 48 c1 e0 03 48 01 c2 66 83 7a 1a 00 7e c0 48 8b 3a \u0026lt;4c\u0026gt; 8b 07 4c 89 02 49 89 50 08 48 c7 47 08 00 00 00 00 48 c7 07 00 Todo el c\u00f3digo ======== 0: 0f b7 50 12 movzwl 0x12(%rax),%edx 4: 48 8d 04 d5 00 00 00 lea 0x0(,%rdx,8),%rax b: 00 c: 48 89 d6 mov %rdx,%rsi f: 48 29 d0 sub %rdx,%rax 12: 48 8b 91 c0 01 00 00 mov 0x1c0(%rcx),%rdx 19: 48 c1 e0 03 shl $0x3,%rax 1d: 48 01 c2 suma %rax,%rdx 20: 66 83 7a 1a 00 cmpw $0x0,0x1a(%rdx) 25: 7e c0 jle 0xffffffffffffffe7 27: 48 8b 3a mov (%rdx),%rdi 2a:* 4c 8b 07 mov (%rdi),%r8 \u0026lt;-- instrucci\u00f3n de captura 2d: 4c 89 02 mov %r8,(%rdx) 30: 49 89 50 08 mov %rdx,0x8(%r8) 34: 48 c7 47 08 00 00 00 movq $0x0,0x8(%rdi) 3b: 00 3c: 48 rex.W 3d: c7 .byte 0xc7 3e: 07 (malo) ... C\u00f3digo que comienza con la instrucci\u00f3n que fallo ============================================= 0: 4c 8b 07 mov (%rdi),%r8 3: 4c 89 02 mov %r8,(%rdx) 6: 49 89 50 08 mov %rdx,0x8(%r8) a: 48 c7 47 08 00 00 00 movq $0x0,0x8(%rdi) 11: 00 12: 48 rex.W 13: c7 .byte 0xc7 14: 07 (malo) ... [ 88.803721] RSP: 0018:ffff9a1f892b7d58 EFLAGS: 00000206 [ 88.804032] RAX: 0000000000000000 RBX: ffff9a1f8420c800 RCX: ffff9a1f8420c800 [ 88.8 04560] RDX: ffff9a1f81bc1440 RSI: 00000000000000000 RDI: 0000000000000000 [ 88.805056] RBP: ffffffffc04bb0e0 R08: 0000000000000001 R09: 00000000ff7f9a1f [ 88.805473] R10: 000000000001001b R11: 0000000000009a1f R12: 0000000000000140 [ 88.806194] R13: 0000000000000001 R14: ffff9a1f886df400 R15: ffff9a1f886df4ac [ 88.806734] FS: 00007f445601a740(0000) GS:ffff9a2e7fd80000(0000) knlGS:0000000000000000 [ 88.807225] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 88.807672] CR2: 0000000000000000 CR3: 000000050cc46000 CR4: 00000000000006f0 [ 88.808165] Seguimiento de llamadas: [ 88.808459]  [ 88.808710] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) [ 88.809261] ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623) [ 88.810074] ? sfq_dequeue (net/sched/sch_sfq.c:272 net/sched/sch_sfq.c:499) sch_sfq [ 88.810411] sfq_reset (net/sched/sch_sfq.c:525) sch_sfq [ 88.810671] qdisc_reset (./include/linux/skbuff.h:2135 ./include/linux/skbuff.h:2441 ./include/linux/skbuff.h:3304 ./include/linux/skbuff.h:3310 net/sched/sch_g ---truncado---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/net/sch_generic.h\",\"net/sched/sch_api.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"175f9c1bba9b825d22b142d183c9e175488b260c\",\"lessThan\":\"2acbb9539bc2284e30d2aeb789c3d96287014264\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"175f9c1bba9b825d22b142d183c9e175488b260c\",\"lessThan\":\"adbc3eef43fc94c7c8436da832691ae02333a972\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"175f9c1bba9b825d22b142d183c9e175488b260c\",\"lessThan\":\"8fb6503592d39065316f45d267c5527b4e7cd995\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"175f9c1bba9b825d22b142d183c9e175488b260c\",\"lessThan\":\"76feedc74b90270390fbfdf74a2e944e96872363\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"175f9c1bba9b825d22b142d183c9e175488b260c\",\"lessThan\":\"1edf039ee01788ffc25625fe58a903ae2efa213e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"175f9c1bba9b825d22b142d183c9e175488b260c\",\"lessThan\":\"3dc6ee96473cc2962c6db4297d4631f261be150f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"175f9c1bba9b825d22b142d183c9e175488b260c\",\"lessThan\":\"3cb7cf1540ddff5473d6baeb530228d19bc97b8a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/net/sch_generic.h\",\"net/sched/sch_api.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.27\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.27\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.285\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.227\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.168\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.113\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.57\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.11.4\",\"lessThanOrEqual\":\"6.11.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"RUGGEDCOM RST2428P\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"V3.2\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"V3.2\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SCALANCE XCM-/XRM-/XCH-/XRH-300 family\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"V3.2\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"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\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-10-22T13:25:02.696853Z\",\"id\":\"CVE-2024-50039\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.27\",\"versionEndExcluding\":\"5.10.227\",\"matchCriteriaId\":\"F57D1442-15E5-4DEF-B815-CC318D489E35\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.168\",\"matchCriteriaId\":\"4D51C05D-455B-4D8D-89E7-A58E140B864C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.113\",\"matchCriteriaId\":\"D01BD22E-ACD1-4618-9D01-6116570BE1EE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.57\",\"matchCriteriaId\":\"05D83DB8-7465-4F88-AFB2-980011992AC1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.11.4\",\"matchCriteriaId\":\"AA84D336-CE9A-4535-B901-1AD77EC17C34\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F361E1D-580F-4A2D-A509-7615F73167A1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"925478D0-3E3D-4E6F-ACD5-09F28D5DF82C\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1edf039ee01788ffc25625fe58a903ae2efa213e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2acbb9539bc2284e30d2aeb789c3d96287014264\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3cb7cf1540ddff5473d6baeb530228d19bc97b8a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3dc6ee96473cc2962c6db4297d4631f261be150f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/76feedc74b90270390fbfdf74a2e944e96872363\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8fb6503592d39065316f45d267c5527b4e7cd995\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/adbc3eef43fc94c7c8436da832691ae02333a972\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-355557.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-13T15:52:32+00:00",
      "cve": "CVE-2024-50039",
      "id": "CVE-2024-50039",
      "initial_release_date": "2024-10-21T00:00:00+00:00",
      "product_status:fixed": "305",
      "product_status:known_affected": "112",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: accept TCA_STAB only for root qdisc",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-50039.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T22:24:45.361Z\"}}, {\"affected\": [{\"vendor\": \"Siemens\", \"product\": \"RUGGEDCOM RST2428P\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"V3.2\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"V3.2\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SCALANCE XCM-/XRM-/XCH-/XRH-300 family\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"V3.2\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-355557.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-05-12T11:59:51.952Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-50039\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:25:02.696853Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:25:05.945Z\"}}], \"cna\": {\"title\": \"net/sched: accept TCA_STAB only for root qdisc\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"175f9c1bba9b825d22b142d183c9e175488b260c\", \"lessThan\": \"2acbb9539bc2284e30d2aeb789c3d96287014264\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"175f9c1bba9b825d22b142d183c9e175488b260c\", \"lessThan\": \"adbc3eef43fc94c7c8436da832691ae02333a972\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"175f9c1bba9b825d22b142d183c9e175488b260c\", \"lessThan\": \"8fb6503592d39065316f45d267c5527b4e7cd995\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"175f9c1bba9b825d22b142d183c9e175488b260c\", \"lessThan\": \"76feedc74b90270390fbfdf74a2e944e96872363\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"175f9c1bba9b825d22b142d183c9e175488b260c\", \"lessThan\": \"1edf039ee01788ffc25625fe58a903ae2efa213e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"175f9c1bba9b825d22b142d183c9e175488b260c\", \"lessThan\": \"3dc6ee96473cc2962c6db4297d4631f261be150f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"175f9c1bba9b825d22b142d183c9e175488b260c\", \"lessThan\": \"3cb7cf1540ddff5473d6baeb530228d19bc97b8a\", \"versionType\": \"git\"}], \"programFiles\": [\"include/net/sch_generic.h\", \"net/sched/sch_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\": \"2.6.27\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.27\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.285\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.227\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.113\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.57\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/net/sch_generic.h\", \"net/sched/sch_api.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/2acbb9539bc2284e30d2aeb789c3d96287014264\"}, {\"url\": \"https://git.kernel.org/stable/c/adbc3eef43fc94c7c8436da832691ae02333a972\"}, {\"url\": \"https://git.kernel.org/stable/c/8fb6503592d39065316f45d267c5527b4e7cd995\"}, {\"url\": \"https://git.kernel.org/stable/c/76feedc74b90270390fbfdf74a2e944e96872363\"}, {\"url\": \"https://git.kernel.org/stable/c/1edf039ee01788ffc25625fe58a903ae2efa213e\"}, {\"url\": \"https://git.kernel.org/stable/c/3dc6ee96473cc2962c6db4297d4631f261be150f\"}, {\"url\": \"https://git.kernel.org/stable/c/3cb7cf1540ddff5473d6baeb530228d19bc97b8a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/sched: accept TCA_STAB only for root qdisc\\n\\nMost qdiscs maintain their backlog using qdisc_pkt_len(skb)\\non the assumption it is invariant between the enqueue()\\nand dequeue() handlers.\\n\\nUnfortunately syzbot can crash a host rather easily using\\na TBF + SFQ combination, with an STAB on SFQ [1]\\n\\nWe can\u0027t support TCA_STAB on arbitrary level, this would\\nrequire to maintain per-qdisc storage.\\n\\n[1]\\n[   88.796496] BUG: kernel NULL pointer dereference, address: 0000000000000000\\n[   88.798611] #PF: supervisor read access in kernel mode\\n[   88.799014] #PF: error_code(0x0000) - not-present page\\n[   88.799506] PGD 0 P4D 0\\n[   88.799829] Oops: Oops: 0000 [#1] SMP NOPTI\\n[   88.800569] CPU: 14 UID: 0 PID: 2053 Comm: b371744477 Not tainted 6.12.0-rc1-virtme #1117\\n[   88.801107] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\n[   88.801779] RIP: 0010:sfq_dequeue (net/sched/sch_sfq.c:272 net/sched/sch_sfq.c:499) sch_sfq\\n[ 88.802544] Code: 0f b7 50 12 48 8d 04 d5 00 00 00 00 48 89 d6 48 29 d0 48 8b 91 c0 01 00 00 48 c1 e0 03 48 01 c2 66 83 7a 1a 00 7e c0 48 8b 3a \u003c4c\u003e 8b 07 4c 89 02 49 89 50 08 48 c7 47 08 00 00 00 00 48 c7 07 00\\nAll code\\n========\\n   0:\\t0f b7 50 12          \\tmovzwl 0x12(%rax),%edx\\n   4:\\t48 8d 04 d5 00 00 00 \\tlea    0x0(,%rdx,8),%rax\\n   b:\\t00\\n   c:\\t48 89 d6             \\tmov    %rdx,%rsi\\n   f:\\t48 29 d0             \\tsub    %rdx,%rax\\n  12:\\t48 8b 91 c0 01 00 00 \\tmov    0x1c0(%rcx),%rdx\\n  19:\\t48 c1 e0 03          \\tshl    $0x3,%rax\\n  1d:\\t48 01 c2             \\tadd    %rax,%rdx\\n  20:\\t66 83 7a 1a 00       \\tcmpw   $0x0,0x1a(%rdx)\\n  25:\\t7e c0                \\tjle    0xffffffffffffffe7\\n  27:\\t48 8b 3a             \\tmov    (%rdx),%rdi\\n  2a:*\\t4c 8b 07             \\tmov    (%rdi),%r8\\t\\t\u003c-- trapping instruction\\n  2d:\\t4c 89 02             \\tmov    %r8,(%rdx)\\n  30:\\t49 89 50 08          \\tmov    %rdx,0x8(%r8)\\n  34:\\t48 c7 47 08 00 00 00 \\tmovq   $0x0,0x8(%rdi)\\n  3b:\\t00\\n  3c:\\t48                   \\trex.W\\n  3d:\\tc7                   \\t.byte 0xc7\\n  3e:\\t07                   \\t(bad)\\n\\t...\\n\\nCode starting with the faulting instruction\\n===========================================\\n   0:\\t4c 8b 07             \\tmov    (%rdi),%r8\\n   3:\\t4c 89 02             \\tmov    %r8,(%rdx)\\n   6:\\t49 89 50 08          \\tmov    %rdx,0x8(%r8)\\n   a:\\t48 c7 47 08 00 00 00 \\tmovq   $0x0,0x8(%rdi)\\n  11:\\t00\\n  12:\\t48                   \\trex.W\\n  13:\\tc7                   \\t.byte 0xc7\\n  14:\\t07                   \\t(bad)\\n\\t...\\n[   88.803721] RSP: 0018:ffff9a1f892b7d58 EFLAGS: 00000206\\n[   88.804032] RAX: 0000000000000000 RBX: ffff9a1f8420c800 RCX: ffff9a1f8420c800\\n[   88.804560] RDX: ffff9a1f81bc1440 RSI: 0000000000000000 RDI: 0000000000000000\\n[   88.805056] RBP: ffffffffc04bb0e0 R08: 0000000000000001 R09: 00000000ff7f9a1f\\n[   88.805473] R10: 000000000001001b R11: 0000000000009a1f R12: 0000000000000140\\n[   88.806194] R13: 0000000000000001 R14: ffff9a1f886df400 R15: ffff9a1f886df4ac\\n[   88.806734] FS:  00007f445601a740(0000) GS:ffff9a2e7fd80000(0000) knlGS:0000000000000000\\n[   88.807225] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[   88.807672] CR2: 0000000000000000 CR3: 000000050cc46000 CR4: 00000000000006f0\\n[   88.808165] Call Trace:\\n[   88.808459]  \u003cTASK\u003e\\n[   88.808710] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434)\\n[   88.809261] ? page_fault_oops (arch/x86/mm/fault.c:715)\\n[   88.809561] ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:87 ./arch/x86/include/asm/irqflags.h:147 arch/x86/mm/fault.c:1489 arch/x86/mm/fault.c:1539)\\n[   88.809806] ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623)\\n[   88.810074] ? sfq_dequeue (net/sched/sch_sfq.c:272 net/sched/sch_sfq.c:499) sch_sfq\\n[   88.810411] sfq_reset (net/sched/sch_sfq.c:525) sch_sfq\\n[   88.810671] qdisc_reset (./include/linux/skbuff.h:2135 ./include/linux/skbuff.h:2441 ./include/linux/skbuff.h:3304 ./include/linux/skbuff.h:3310 net/sched/sch_g\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.285\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.227\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.168\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.113\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.57\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.4\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"2.6.27\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T20:44:18.634Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-50039\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-12T11:59:51.952Z\", \"dateReserved\": \"2024-10-21T12:17:06.070Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T19:39:39.115Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.