CVE-2024-49947 (GCVE-0-2024-49947)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:02 – Updated: 2025-05-04 12:59
VLAI?
Title
net: test for not too small csum_start in virtio_net_hdr_to_skb()
Summary
In the Linux kernel, the following vulnerability has been resolved: net: test for not too small csum_start in virtio_net_hdr_to_skb() syzbot was able to trigger this warning [1], after injecting a malicious packet through af_packet, setting skb->csum_start and thus the transport header to an incorrect value. We can at least make sure the transport header is after the end of the network header (with a estimated minimal size). [1] [ 67.873027] skb len=4096 headroom=16 headlen=14 tailroom=0 mac=(-1,-1) mac_len=0 net=(16,-6) trans=10 shinfo(txflags=0 nr_frags=1 gso(size=0 type=0 segs=0)) csum(0xa start=10 offset=0 ip_summed=3 complete_sw=0 valid=0 level=0) hash(0x0 sw=0 l4=0) proto=0x0800 pkttype=0 iif=0 priority=0x0 mark=0x0 alloc_cpu=10 vlan_all=0x0 encapsulation=0 inner(proto=0x0000, mac=0, net=0, trans=0) [ 67.877172] dev name=veth0_vlan feat=0x000061164fdd09e9 [ 67.877764] sk family=17 type=3 proto=0 [ 67.878279] skb linear: 00000000: 00 00 10 00 00 00 00 00 0f 00 00 00 08 00 [ 67.879128] skb frag: 00000000: 0e 00 07 00 00 00 28 00 08 80 1c 00 04 00 00 02 [ 67.879877] skb frag: 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.880647] skb frag: 00000020: 00 00 02 00 00 00 08 00 1b 00 00 00 00 00 00 00 [ 67.881156] skb frag: 00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.881753] skb frag: 00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.882173] skb frag: 00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.882790] skb frag: 00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.883171] skb frag: 00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.883733] skb frag: 00000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.884206] skb frag: 00000090: 00 00 00 00 00 00 00 00 00 00 69 70 76 6c 61 6e [ 67.884704] skb frag: 000000a0: 31 00 00 00 00 00 00 00 00 00 2b 00 00 00 00 00 [ 67.885139] skb frag: 000000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.885677] skb frag: 000000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.886042] skb frag: 000000d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.886408] skb frag: 000000e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.887020] skb frag: 000000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.887384] skb frag: 00000100: 00 00 [ 67.887878] ------------[ cut here ]------------ [ 67.887908] offset (-6) >= skb_headlen() (14) [ 67.888445] WARNING: CPU: 10 PID: 2088 at net/core/dev.c:3332 skb_checksum_help (net/core/dev.c:3332 (discriminator 2)) [ 67.889353] Modules linked in: macsec macvtap macvlan hsr wireguard curve25519_x86_64 libcurve25519_generic libchacha20poly1305 chacha_x86_64 libchacha poly1305_x86_64 dummy bridge sr_mod cdrom evdev pcspkr i2c_piix4 9pnet_virtio 9p 9pnet netfs [ 67.890111] CPU: 10 UID: 0 PID: 2088 Comm: b363492833 Not tainted 6.11.0-virtme #1011 [ 67.890183] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 67.890309] RIP: 0010:skb_checksum_help (net/core/dev.c:3332 (discriminator 2)) [ 67.891043] Call Trace: [ 67.891173] <TASK> [ 67.891274] ? __warn (kernel/panic.c:741) [ 67.891320] ? skb_checksum_help (net/core/dev.c:3332 (discriminator 2)) [ 67.891333] ? report_bug (lib/bug.c:180 lib/bug.c:219) [ 67.891348] ? handle_bug (arch/x86/kernel/traps.c:239) [ 67.891363] ? exc_invalid_op (arch/x86/kernel/traps.c:260 (discriminator 1)) [ 67.891372] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) [ 67.891388] ? skb_checksum_help (net/core/dev.c:3332 (discriminator 2)) [ 67.891399] ? skb_checksum_help (net/core/dev.c:3332 (discriminator 2)) [ 67.891416] ip_do_fragment (net/ipv4/ip_output.c:777 (discriminator 1)) [ 67.891448] ? __ip_local_out (./include/linux/skbuff.h:1146 ./include/net/l3mdev.h:196 ./include/net/l3mdev.h:213 ne ---truncated---
Severity ?
No CVSS data available.
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: 342c88f406c2acd3dd00767aeacafe883cebb374 , < d9dfd41e32ccc5198033ddd1ff1516822dfefa5a (git)
Affected: 9181d6f8a2bb32d158de66a84164fac05e3ddd18 , < 4cc0648e9e3240496835dc698ace1d046d8d57ea (git)
Affected: 9181d6f8a2bb32d158de66a84164fac05e3ddd18 , < 7711c419a915ee0dd91c125d2b967bbf2a72e9ac (git)
Affected: 9181d6f8a2bb32d158de66a84164fac05e3ddd18 , < 49d14b54a527289d09a9480f214b8c586322310a (git)
Affected: 765290b628c2fb764bdfaf8088754439665751e8 (git)
Create a notification for this product.
    Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.6.55 , ≤ 6.6.* (semver)
Unaffected: 6.10.14 , ≤ 6.10.* (semver)
Unaffected: 6.11.3 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website

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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: test for not too small csum_start in virtio_net_hdr_to_skb()\n\nsyzbot was able to trigger this warning [1], after injecting a\nmalicious packet through af_packet, setting skb-\u003ecsum_start and thus\nthe transport header to an incorrect value.\n\nWe can at least make sure the transport header is after\nthe end of the network header (with a estimated minimal size).\n\n[1]\n[   67.873027] skb len=4096 headroom=16 headlen=14 tailroom=0\nmac=(-1,-1) mac_len=0 net=(16,-6) trans=10\nshinfo(txflags=0 nr_frags=1 gso(size=0 type=0 segs=0))\ncsum(0xa start=10 offset=0 ip_summed=3 complete_sw=0 valid=0 level=0)\nhash(0x0 sw=0 l4=0) proto=0x0800 pkttype=0 iif=0\npriority=0x0 mark=0x0 alloc_cpu=10 vlan_all=0x0\nencapsulation=0 inner(proto=0x0000, mac=0, net=0, trans=0)\n[   67.877172] dev name=veth0_vlan feat=0x000061164fdd09e9\n[   67.877764] sk family=17 type=3 proto=0\n[   67.878279] skb linear:   00000000: 00 00 10 00 00 00 00 00 0f 00 00 00 08 00\n[   67.879128] skb frag:     00000000: 0e 00 07 00 00 00 28 00 08 80 1c 00 04 00 00 02\n[   67.879877] skb frag:     00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   67.880647] skb frag:     00000020: 00 00 02 00 00 00 08 00 1b 00 00 00 00 00 00 00\n[   67.881156] skb frag:     00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   67.881753] skb frag:     00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   67.882173] skb frag:     00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   67.882790] skb frag:     00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   67.883171] skb frag:     00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   67.883733] skb frag:     00000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   67.884206] skb frag:     00000090: 00 00 00 00 00 00 00 00 00 00 69 70 76 6c 61 6e\n[   67.884704] skb frag:     000000a0: 31 00 00 00 00 00 00 00 00 00 2b 00 00 00 00 00\n[   67.885139] skb frag:     000000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   67.885677] skb frag:     000000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   67.886042] skb frag:     000000d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   67.886408] skb frag:     000000e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   67.887020] skb frag:     000000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   67.887384] skb frag:     00000100: 00 00\n[   67.887878] ------------[ cut here ]------------\n[   67.887908] offset (-6) \u003e= skb_headlen() (14)\n[   67.888445] WARNING: CPU: 10 PID: 2088 at net/core/dev.c:3332 skb_checksum_help (net/core/dev.c:3332 (discriminator 2))\n[   67.889353] Modules linked in: macsec macvtap macvlan hsr wireguard curve25519_x86_64 libcurve25519_generic libchacha20poly1305 chacha_x86_64 libchacha poly1305_x86_64 dummy bridge sr_mod cdrom evdev pcspkr i2c_piix4 9pnet_virtio 9p 9pnet netfs\n[   67.890111] CPU: 10 UID: 0 PID: 2088 Comm: b363492833 Not tainted 6.11.0-virtme #1011\n[   67.890183] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   67.890309] RIP: 0010:skb_checksum_help (net/core/dev.c:3332 (discriminator 2))\n[   67.891043] Call Trace:\n[   67.891173]  \u003cTASK\u003e\n[   67.891274] ? __warn (kernel/panic.c:741)\n[   67.891320] ? skb_checksum_help (net/core/dev.c:3332 (discriminator 2))\n[   67.891333] ? report_bug (lib/bug.c:180 lib/bug.c:219)\n[   67.891348] ? handle_bug (arch/x86/kernel/traps.c:239)\n[   67.891363] ? exc_invalid_op (arch/x86/kernel/traps.c:260 (discriminator 1))\n[   67.891372] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)\n[   67.891388] ? skb_checksum_help (net/core/dev.c:3332 (discriminator 2))\n[   67.891399] ? skb_checksum_help (net/core/dev.c:3332 (discriminator 2))\n[   67.891416] ip_do_fragment (net/ipv4/ip_output.c:777 (discriminator 1))\n[   67.891448] ? __ip_local_out (./include/linux/skbuff.h:1146 ./include/net/l3mdev.h:196 ./include/net/l3mdev.h:213 ne\n---truncated---"
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      "providerMetadata": {
        "dateUpdated": "2025-05-04T12:59:11.364Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d9dfd41e32ccc5198033ddd1ff1516822dfefa5a"
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        {
          "url": "https://git.kernel.org/stable/c/4cc0648e9e3240496835dc698ace1d046d8d57ea"
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          "url": "https://git.kernel.org/stable/c/7711c419a915ee0dd91c125d2b967bbf2a72e9ac"
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        {
          "url": "https://git.kernel.org/stable/c/49d14b54a527289d09a9480f214b8c586322310a"
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      "title": "net: test for not too small csum_start in virtio_net_hdr_to_skb()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-49947",
    "datePublished": "2024-10-21T18:02:04.456Z",
    "dateReserved": "2024-10-21T12:17:06.045Z",
    "dateUpdated": "2025-05-04T12:59:11.364Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
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\"unaffected\", \"version\": \"6.6.55\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/linux/virtio_net.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d9dfd41e32ccc5198033ddd1ff1516822dfefa5a\"}, {\"url\": \"https://git.kernel.org/stable/c/4cc0648e9e3240496835dc698ace1d046d8d57ea\"}, {\"url\": \"https://git.kernel.org/stable/c/7711c419a915ee0dd91c125d2b967bbf2a72e9ac\"}, {\"url\": \"https://git.kernel.org/stable/c/49d14b54a527289d09a9480f214b8c586322310a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: test for not too small csum_start in virtio_net_hdr_to_skb()\\n\\nsyzbot was able to trigger this warning [1], after injecting a\\nmalicious packet through af_packet, setting skb-\u003ecsum_start and thus\\nthe transport header to an incorrect value.\\n\\nWe can at least make sure the transport header is after\\nthe end of the network header (with a estimated minimal size).\\n\\n[1]\\n[   67.873027] skb len=4096 headroom=16 headlen=14 tailroom=0\\nmac=(-1,-1) mac_len=0 net=(16,-6) trans=10\\nshinfo(txflags=0 nr_frags=1 gso(size=0 type=0 segs=0))\\ncsum(0xa start=10 offset=0 ip_summed=3 complete_sw=0 valid=0 level=0)\\nhash(0x0 sw=0 l4=0) proto=0x0800 pkttype=0 iif=0\\npriority=0x0 mark=0x0 alloc_cpu=10 vlan_all=0x0\\nencapsulation=0 inner(proto=0x0000, mac=0, net=0, trans=0)\\n[   67.877172] dev name=veth0_vlan feat=0x000061164fdd09e9\\n[   67.877764] sk family=17 type=3 proto=0\\n[   67.878279] skb linear:   00000000: 00 00 10 00 00 00 00 00 0f 00 00 00 08 00\\n[   67.879128] skb frag:     00000000: 0e 00 07 00 00 00 28 00 08 80 1c 00 04 00 00 02\\n[   67.879877] skb frag:     00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[   67.880647] skb frag:     00000020: 00 00 02 00 00 00 08 00 1b 00 00 00 00 00 00 00\\n[   67.881156] skb frag:     00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[   67.881753] skb frag:     00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[   67.882173] skb frag:     00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[   67.882790] skb frag:     00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[   67.883171] skb frag:     00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[   67.883733] skb frag:     00000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[   67.884206] skb frag:     00000090: 00 00 00 00 00 00 00 00 00 00 69 70 76 6c 61 6e\\n[   67.884704] skb frag:     000000a0: 31 00 00 00 00 00 00 00 00 00 2b 00 00 00 00 00\\n[   67.885139] skb frag:     000000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[   67.885677] skb frag:     000000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[   67.886042] skb frag:     000000d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[   67.886408] skb frag:     000000e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[   67.887020] skb frag:     000000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n[   67.887384] skb frag:     00000100: 00 00\\n[   67.887878] ------------[ cut here ]------------\\n[   67.887908] offset (-6) \u003e= skb_headlen() (14)\\n[   67.888445] WARNING: CPU: 10 PID: 2088 at net/core/dev.c:3332 skb_checksum_help (net/core/dev.c:3332 (discriminator 2))\\n[   67.889353] Modules linked in: macsec macvtap macvlan hsr wireguard curve25519_x86_64 libcurve25519_generic libchacha20poly1305 chacha_x86_64 libchacha poly1305_x86_64 dummy bridge sr_mod cdrom evdev pcspkr i2c_piix4 9pnet_virtio 9p 9pnet netfs\\n[   67.890111] CPU: 10 UID: 0 PID: 2088 Comm: b363492833 Not tainted 6.11.0-virtme #1011\\n[   67.890183] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\n[   67.890309] RIP: 0010:skb_checksum_help (net/core/dev.c:3332 (discriminator 2))\\n[   67.891043] Call Trace:\\n[   67.891173]  \u003cTASK\u003e\\n[   67.891274] ? __warn (kernel/panic.c:741)\\n[   67.891320] ? skb_checksum_help (net/core/dev.c:3332 (discriminator 2))\\n[   67.891333] ? report_bug (lib/bug.c:180 lib/bug.c:219)\\n[   67.891348] ? handle_bug (arch/x86/kernel/traps.c:239)\\n[   67.891363] ? exc_invalid_op (arch/x86/kernel/traps.c:260 (discriminator 1))\\n[   67.891372] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)\\n[   67.891388] ? skb_checksum_help (net/core/dev.c:3332 (discriminator 2))\\n[   67.891399] ? skb_checksum_help (net/core/dev.c:3332 (discriminator 2))\\n[   67.891416] ip_do_fragment (net/ipv4/ip_output.c:777 (discriminator 1))\\n[   67.891448] ? __ip_local_out (./include/linux/skbuff.h:1146 ./include/net/l3mdev.h:196 ./include/net/l3mdev.h:213 ne\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.55\", \"versionStartIncluding\": \"6.6.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.14\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.3\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.7.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:59:11.364Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-49947\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:59:11.364Z\", \"dateReserved\": \"2024-10-21T12:17:06.045Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:02:04.456Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

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.


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