CVE-2024-38538 (GCVE-0-2024-38538)
Vulnerability from cvelistv5
Published
2024-06-19 13:35
Modified
2025-11-03 20:38
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: bridge: xmit: make sure we have at least eth header len bytes syzbot triggered an uninit value[1] error in bridge device's xmit path by sending a short (less than ETH_HLEN bytes) skb. To fix it check if we can actually pull that amount instead of assuming. Tested with dropwatch: drop at: br_dev_xmit+0xb93/0x12d0 [bridge] (0xffffffffc06739b3) origin: software timestamp: Mon May 13 11:31:53 2024 778214037 nsec protocol: 0x88a8 length: 2 original length: 2 drop reason: PKT_TOO_SMALL [1] BUG: KMSAN: uninit-value in 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 [inline] netdev_start_xmit include/linux/netdevice.h:4917 [inline] xmit_one net/core/dev.c:3531 [inline] 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 [inline] __bpf_tx_skb net/core/filter.c:2136 [inline] __bpf_redirect_common net/core/filter.c:2180 [inline] __bpf_redirect+0x14a6/0x1620 net/core/filter.c:2187 ____bpf_clone_redirect net/core/filter.c:2460 [inline] bpf_clone_redirect+0x328/0x470 net/core/filter.c:2432 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997 __bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2238 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] 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 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5678 __do_sys_bpf kernel/bpf/syscall.c:5767 [inline] __se_sys_bpf kernel/bpf/syscall.c:5765 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5765 x64_sys_call+0x96b/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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\"unaffected\", \"version\": \"5.15.172\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.93\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.33\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/bridge/br_device.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3e01fc3c66e65d9afe98f1489047a1b2dd8741ca\"}, {\"url\": \"https://git.kernel.org/stable/c/b2b7c43cd32080221bb233741bd6011983fe7c11\"}, {\"url\": \"https://git.kernel.org/stable/c/82090f94c723dab724b1c32db406091d40448a17\"}, {\"url\": \"https://git.kernel.org/stable/c/c964429ef53f42098a6545a5dabeb1441c1e821d\"}, {\"url\": \"https://git.kernel.org/stable/c/28126b83f86ab9cc7936029c2dff845d3dcedba2\"}, {\"url\": \"https://git.kernel.org/stable/c/1abb371147905ba250b4cc0230c4be7e90bea4d5\"}, {\"url\": \"https://git.kernel.org/stable/c/f482fd4ce919836a49012b2d31b00fc36e2488f2\"}, {\"url\": \"https://git.kernel.org/stable/c/5b5d669f569807c7ab07546e73c0741845a2547a\"}, {\"url\": \"https://git.kernel.org/stable/c/8bd67ebb50c0145fd2ca8681ab65eb7e8cde1afc\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: bridge: xmit: make sure we have at least eth header len bytes\\n\\nsyzbot triggered an uninit value[1] error in bridge device\u0027s xmit path\\nby sending a short (less than ETH_HLEN bytes) skb. 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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.324\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.286\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.230\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.172\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.93\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.33\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.12\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.3\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"2.6.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:13:32.769Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-38538\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T20:38:07.132Z\", \"dateReserved\": \"2024-06-18T19:36:34.918Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-19T13:35:13.384Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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