CVE-2024-50039

{"id": "CVE-2024-50039", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-10-21T20:15:16.957", "references": [{"url": "https://git.kernel.org/stable/c/1edf039ee01788ffc25625fe58a903ae2efa213e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/2acbb9539bc2284e30d2aeb789c3d96287014264", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3cb7cf1540ddff5473d6baeb530228d19bc97b8a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3dc6ee96473cc2962c6db4297d4631f261be150f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/76feedc74b90270390fbfdf74a2e944e96872363", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8fb6503592d39065316f45d267c5527b4e7cd995", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/adbc3eef43fc94c7c8436da832691ae02333a972", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-476"}]}], "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't 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 <4c> 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<-- 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] <TASK>\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 &lt;4c&gt; 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 &lt;-- 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---"}], "lastModified": "2024-11-08T16:15:43.850", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F57D1442-15E5-4DEF-B815-CC318D489E35", "versionEndExcluding": "5.10.227", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4D51C05D-455B-4D8D-89E7-A58E140B864C", "versionEndExcluding": "5.15.168", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D01BD22E-ACD1-4618-9D01-6116570BE1EE", "versionEndExcluding": "6.1.113", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "05D83DB8-7465-4F88-AFB2-980011992AC1", "versionEndExcluding": "6.6.57", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AA84D336-CE9A-4535-B901-1AD77EC17C34", "versionEndExcluding": "6.11.4", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7F361E1D-580F-4A2D-A509-7615F73167A1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "925478D0-3E3D-4E6F-ACD5-09F28D5DF82C"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}