cve-2024-38538
Vulnerability from cvelistv5
Published
2024-06-19 13:35
Modified
2024-11-17 15:02
Severity ?
EPSS score ?
Summary
net: bridge: xmit: make sure we have at least eth header len bytes
References
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To fix it check if\\nwe can actually pull that amount instead of assuming.\\n\\nTested with dropwatch:\\n drop at: br_dev_xmit+0xb93/0x12d0 [bridge] (0xffffffffc06739b3)\\n origin: software\\n timestamp: Mon May 13 11:31:53 2024 778214037 nsec\\n protocol: 0x88a8\\n length: 2\\n original length: 2\\n drop reason: PKT_TOO_SMALL\\n\\n[1]\\nBUG: KMSAN: uninit-value in br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65\\n br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65\\n __netdev_start_xmit include/linux/netdevice.h:4903 [inline]\\n netdev_start_xmit include/linux/netdevice.h:4917 [inline]\\n xmit_one net/core/dev.c:3531 [inline]\\n dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547\\n __dev_queue_xmit+0x34db/0x5350 net/core/dev.c:4341\\n dev_queue_xmit include/linux/netdevice.h:3091 [inline]\\n __bpf_tx_skb net/core/filter.c:2136 [inline]\\n __bpf_redirect_common net/core/filter.c:2180 [inline]\\n __bpf_redirect+0x14a6/0x1620 net/core/filter.c:2187\\n ____bpf_clone_redirect net/core/filter.c:2460 [inline]\\n bpf_clone_redirect+0x328/0x470 net/core/filter.c:2432\\n ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997\\n __bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2238\\n bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]\\n __bpf_prog_run include/linux/filter.h:657 [inline]\\n bpf_prog_run include/linux/filter.h:664 [inline]\\n bpf_test_run+0x499/0xc30 net/bpf/test_run.c:425\\n bpf_prog_test_run_skb+0x14ea/0x1f20 net/bpf/test_run.c:1058\\n bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4269\\n __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5678\\n __do_sys_bpf kernel/bpf/syscall.c:5767 [inline]\\n __se_sys_bpf kernel/bpf/syscall.c:5765 [inline]\\n __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5765\\n x64_sys_call+0x96b/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:322\\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: bridge: xmit: aseg\u00farese de tener al menos el encabezado eth len bytes syzbot desencaden\u00f3 un error de valor uninit[1] en la ruta xmit del dispositivo puente al enviar un mensaje corto (menos de ETH_HLEN bytes) skb. Para solucionarlo, compruebe si realmente podemos retirar esa cantidad en lugar de suponerla. Probado con dropwatch: soltar en: br_dev_xmit+0xb93/0x12d0 [puente] (0xffffffffc06739b3) origen: marca de tiempo del software: lunes 13 de mayo 11:31:53 2024 778214037 protocolo nsec: 0x88a8 longitud: 2 longitud original: 2 motivo de ca\u00edda: PKT_TOO_SMALL [1 ] ERROR: KMSAN: valor uninit en br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65 br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65 __netdev_start_xmit include/linux/netdevice.h:4903 [en l\u00ednea] netdev_start_xmit include/linux/netdevice.h:4917 [en l\u00ednea] xmit_one net/core/dev.c:3531 [en l\u00ednea] dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547 __dev_queue_xmit+0x34db/0x5350 net/core/dev .c:4341 dev_queue_xmit include/linux/netdevice.h:3091 [en l\u00ednea] __bpf_tx_skb net/core/filter.c:2136 [en l\u00ednea] __bpf_redirect_common net/core/filter.c:2180 [en l\u00ednea] __bpf_redirect+0x14a6/0x1620 net/ Core/Filter.C: 2187 ____BPF_CLONE_REDIRECT NET/CORE/FILTRO.C: 2460 [Inline] BPF_CLONE_REDIRECT+0x328/0x470 NET/Core/Filter.c: 2432 ___ BPF_PROG_RUN+0X13FE/0XE0F0 KERNEL/BPF/BPF/CORE. 0xb5/0xe0 kernel/bpf/core.c:2238 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [en l\u00ednea] __bpf_prog_run include/linux/filter.h:657 [en l\u00ednea] bpf_prog_run include/linux/filter.h:664 [en l\u00ednea ] bpf_test_run+0x499/0xc30 net/bpf/test_run.c:425 bpf_prog_test_run_skb+0x14ea/0x1f20 net/bpf/test_run.c:1058 bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4269 pf+0x6aa/0xd90 n\u00facleo/ bpf/syscall.c:5678 __do_sys_bpf kernel/bpf/syscall.c:5767 [en l\u00ednea] __se_sys_bpf kernel/bpf/syscall.c:5765 [en l\u00ednea] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5765 ys_call+0x96b /0x3b50 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 Entry_SYSCALL_64_after_hwframe+ 0x77/0x7f\"}],\"metrics\":{\"cvssMetricV31\":[{\"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:H/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-908\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.12\",\"versionEndExcluding\":\"6.1.93\",\"matchCriteriaId\":\"A0CD5542-EADA-49C4-B859-AC21A3303899\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.33\",\"matchCriteriaId\":\"FCE796DF-3B50-4DC6-BAE5-95271068FC9E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.8.12\",\"matchCriteriaId\":\"80550309-67AB-4FD1-AC07-3DED5C4F01B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.9\",\"versionEndExcluding\":\"6.9.3\",\"matchCriteriaId\":\"E07124C1-19E8-4D21-828D-9932A01D3011\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1abb371147905ba250b4cc0230c4be7e90bea4d5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/28126b83f86ab9cc7936029c2dff845d3dcedba2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3e01fc3c66e65d9afe98f1489047a1b2dd8741ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5b5d669f569807c7ab07546e73c0741845a2547a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/82090f94c723dab724b1c32db406091d40448a17\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8bd67ebb50c0145fd2ca8681ab65eb7e8cde1afc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b2b7c43cd32080221bb233741bd6011983fe7c11\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c964429ef53f42098a6545a5dabeb1441c1e821d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f482fd4ce919836a49012b2d31b00fc36e2488f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
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