CVE-2024-50256

{"id": "CVE-2024-50256", "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": "2024-11-09T11:15:11.263", "references": [{"url": "https://git.kernel.org/stable/c/4ed234fe793f27a3b151c43d2106df2ff0d81aac", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4f7b586aae53c2ed820661803da8ce18b1361921", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f85b057e34419e5ec0583a65078a11ccc1d4540a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fef63832317d9d24e1214cdd8f204d02ebdf8499", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_reject_ipv6: fix potential crash in nf_send_reset6()\n\nI got a syzbot report without a repro [1] crashing in nf_send_reset6()\n\nI think the issue is that dev->hard_header_len is zero, and we attempt\nlater to push an Ethernet header.\n\nUse LL_MAX_HEADER, as other functions in net/ipv6/netfilter/nf_reject_ipv6.c.\n\n[1]\n\nskbuff: skb_under_panic: text:ffffffff89b1d008 len:74 put:14 head:ffff88803123aa00 data:ffff88803123a9f2 tail:0x3c end:0x140 dev:syz_tun\n kernel BUG at net/core/skbuff.c:206 !\nOops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\nCPU: 0 UID: 0 PID: 7373 Comm: syz.1.568 Not tainted 6.12.0-rc2-syzkaller-00631-g6d858708d465 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\n RIP: 0010:skb_panic net/core/skbuff.c:206 [inline]\n RIP: 0010:skb_under_panic+0x14b/0x150 net/core/skbuff.c:216\nCode: 0d 8d 48 c7 c6 60 a6 29 8e 48 8b 54 24 08 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 41 54 41 57 41 56 e8 ba 30 38 02 48 83 c4 20 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3\nRSP: 0018:ffffc900045269b0 EFLAGS: 00010282\nRAX: 0000000000000088 RBX: dffffc0000000000 RCX: cd66dacdc5d8e800\nRDX: 0000000000000000 RSI: 0000000000000200 RDI: 0000000000000000\nRBP: ffff88802d39a3d0 R08: ffffffff8174afec R09: 1ffff920008a4ccc\nR10: dffffc0000000000 R11: fffff520008a4ccd R12: 0000000000000140\nR13: ffff88803123aa00 R14: ffff88803123a9f2 R15: 000000000000003c\nFS: 00007fdbee5ff6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000000000 CR3: 000000005d322000 CR4: 00000000003526f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n skb_push+0xe5/0x100 net/core/skbuff.c:2636\n eth_header+0x38/0x1f0 net/ethernet/eth.c:83\n dev_hard_header include/linux/netdevice.h:3208 [inline]\n nf_send_reset6+0xce6/0x1270 net/ipv6/netfilter/nf_reject_ipv6.c:358\n nft_reject_inet_eval+0x3b9/0x690 net/netfilter/nft_reject_inet.c:48\n expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]\n nft_do_chain+0x4ad/0x1da0 net/netfilter/nf_tables_core.c:288\n nft_do_chain_inet+0x418/0x6b0 net/netfilter/nft_chain_filter.c:161\n nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]\n nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626\n nf_hook include/linux/netfilter.h:269 [inline]\n NF_HOOK include/linux/netfilter.h:312 [inline]\n br_nf_pre_routing_ipv6+0x63e/0x770 net/bridge/br_netfilter_ipv6.c:184\n nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]\n nf_hook_bridge_pre net/bridge/br_input.c:277 [inline]\n br_handle_frame+0x9fd/0x1530 net/bridge/br_input.c:424\n __netif_receive_skb_core+0x13e8/0x4570 net/core/dev.c:5562\n __netif_receive_skb_one_core net/core/dev.c:5666 [inline]\n __netif_receive_skb+0x12f/0x650 net/core/dev.c:5781\n netif_receive_skb_internal net/core/dev.c:5867 [inline]\n netif_receive_skb+0x1e8/0x890 net/core/dev.c:5926\n tun_rx_batched+0x1b7/0x8f0 drivers/net/tun.c:1550\n tun_get_user+0x3056/0x47e0 drivers/net/tun.c:2007\n tun_chr_write_iter+0x10d/0x1f0 drivers/net/tun.c:2053\n new_sync_write fs/read_write.c:590 [inline]\n vfs_write+0xa6d/0xc90 fs/read_write.c:683\n ksys_write+0x183/0x2b0 fs/read_write.c:736\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7fdbeeb7d1ff\nCode: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48\nRSP: 002b:00007fdbee5ff000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001\nRAX: ffffffffffffffda RBX: 00007fdbeed36058 RCX: 00007fdbeeb7d1ff\nRDX: 000000000000008e RSI: 0000000020000040 RDI: 00000000000000c8\nRBP: 00007fdbeebf12be R08: 0000000\n---truncated---"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nf_reject_ipv6: soluciona un posible fallo en nf_send_reset6() Recib\u00ed un informe de syzbot sin una reproducci\u00f3n [1] que falla en nf_send_reset6() Creo que el problema es que dev-&gt;hard_header_len es cero, e intentamos m\u00e1s tarde enviar un encabezado Ethernet. Utilice LL_MAX_HEADER, como otras funciones en net/ipv6/netfilter/nf_reject_ipv6.c. [1] skbuff: skb_under_panic: texto:ffffffff89b1d008 longitud:74 puesta:14 cabeza:ffff88803123aa00 datos:ffff88803123a9f2 cola:0x3c fin:0x140 desarrollo:syz_tun ERROR del kernel en net/core/skbuff.c:206 ! Oops: c\u00f3digo de operaci\u00f3n no v\u00e1lido: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 UID: 0 PID: 7373 Comm: syz.1.568 No contaminado 6.12.0-rc2-syzkaller-00631-g6d858708d465 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 13/09/2024 RIP: 0010:skb_panic net/core/skbuff.c:206 [en l\u00ednea] RIP: 0010:skb_under_panic+0x14b/0x150 net/core/skbuff.c:216 C\u00f3digo: 0d 8d 48 c7 c6 60 a6 29 8e 48 8b 54 24 08 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 41 54 41 57 41 56 e8 ba 30 38 02 48 83 c4 20 90 &lt;0f&gt; 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 RSP: 0018:ffffc900045269b0 EFLAGS: 00010282 RAX: 000000000000088 RBX: dffffc0000000000 RCX: cd66dacdc5d8e800 RDX: 00000000000000000 RSI: 0000000000000200 RDI: 0000000000000000 RBP: ffff88802d39a3d0 R08: ffffffff8174afec R09: 1ffff920008a4ccc R10: dffffc0000000000 R11: fffff520008a4ccd R12: 0000000000000140 R13: ffff88803123aa00 R14: ffff88803123a9f2 R15: 000000000000003c FS: 00007fdbee5ff6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000005d322000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Seguimiento de llamadas: skb_push+0xe5/0x100 net/core/skbuff.c:2636 eth_header+0x38/0x1f0 net/ethernet/eth.c:83 dev_hard_header include/linux/netdevice.h:3208 [en l\u00ednea] nf_send_reset6+0xce6/0x1270 net/ipv6/netfilter/nf_reject_ipv6.c:358 nft_reject_inet_eval+0x3b9/0x690 net/netfilter/nft_reject_inet.c:48 expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [en l\u00ednea] nft_do_chain+0x4ad/0x1da0 net/netfilter/nf_tables_core.c:288 nft_do_chain_inet+0x418/0x6b0 net/netfilter/nft_chain_filter.c:161 nf_hook_entry_hookfn incluye/linux/netfilter.h:154 [en l\u00ednea] nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626 nf_hook incluye/linux/netfilter.h:269 [en l\u00ednea] NF_HOOK incluye/linux/netfilter.h:312 [en l\u00ednea] br_nf_pre_routing_ipv6+0x63e/0x770 net/bridge/br_netfilter_ipv6.c:184 nf_hook_entry_hookfn include/linux/netfilter.h:154 [en l\u00ednea] nf_hook_bridge_pre net/bridge/br_input.c:277 [en l\u00ednea] br_handle_frame+0x9fd/0x1530 net/bridge/br_input.c:424 __netif_receive_skb_core+0x13e8/0x4570 net/core/dev.c:5562 __netif_receive_skb_one_core net/core/dev.c:5666 [en l\u00ednea] __netif_receive_skb+0x12f/0x650 net/core/dev.c:5781 netif_receive_skb_internal net/core/dev.c:5867 [en l\u00ednea] netif_receive_skb+0x1e8/0x890 net/core/dev.c:5926 tun_rx_batched+0x1b7/0x8f0 drivers/net/tun.c:1550 tun_get_user+0x3056/0x47e0 drivers/net/tun.c:2007 tun_chr_write_iter+0x10d/0x1f0 drivers/net/tun.c:2053 new_sync_write fs/read_write.c:590 [en l\u00ednea] vfs_write+0xa6d/0xc90 fs/read_write.c:683 ksys_write+0x183/0x2b0 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdbeeb7d1ff C\u00f3digo: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 &lt;48&gt; 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48 RSP: 002b:00007fdbee5ff000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fdbeed36058 RCX: 00007fdbeeb7d1ff RDX: 00000000000008e RSI: 0000000020000040 RDI: 0000000000000c8 RBP: 00007fdbeebf12be R08: 0000000 ---truncado---"}], "lastModified": "2024-11-14T18:11:08.250", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1D3057E6-E2E5-4994-9D3F-4120E62439DB", "versionEndExcluding": "6.1.116", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "75088E5E-2400-4D20-915F-7A65C55D9CCD", "versionEndExcluding": "6.6.60", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E96F53A4-5E87-4A70-BD9A-BC327828D57F", "versionEndExcluding": "6.11.7", "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"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3C95E234-D335-4B6C-96BF-E2CEBD8654ED"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E0F717D8-3014-4F84-8086-0124B2111379"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "24DBE6C7-2AAE-4818-AED2-E131F153D2FA"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}