CVE-2022-49096 (GCVE-0-2022-49096)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2025-10-01 19:57
VLAI?
Title
net: sfc: add missing xdp queue reinitialization
Summary
In the Linux kernel, the following vulnerability has been resolved: net: sfc: add missing xdp queue reinitialization After rx/tx ring buffer size is changed, kernel panic occurs when it acts XDP_TX or XDP_REDIRECT. When tx/rx ring buffer size is changed(ethtool -G), sfc driver reallocates and reinitializes rx and tx queues and their buffer (tx_queue->buffer). But it misses reinitializing xdp queues(efx->xdp_tx_queues). So, while it is acting XDP_TX or XDP_REDIRECT, it uses the uninitialized tx_queue->buffer. A new function efx_set_xdp_channels() is separated from efx_set_channels() to handle only xdp queues. Splat looks like: BUG: kernel NULL pointer dereference, address: 000000000000002a #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#4] PREEMPT SMP NOPTI RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G D 5.17.0+ #55 e8beeee8289528f11357029357cf Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80 RSP: 0018:ffff92f121e45c60 EFLAGS: 00010297 RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc] RAX: 0000000000000040 RBX: ffff92ea506895c0 RCX: ffffffffc0330870 RDX: 0000000000000001 RSI: 00000001139b10ce RDI: ffff92ea506895c0 RBP: ffffffffc0358a80 R08: 00000001139b110d R09: 0000000000000000 R10: 0000000000000001 R11: ffff92ea414c0088 R12: 0000000000000040 R13: 0000000000000018 R14: 00000001139b10ce R15: ffff92ea506895c0 FS: 0000000000000000(0000) GS:ffff92f121ec0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80 CR2: 000000000000002a CR3: 00000003e6810004 CR4: 00000000007706e0 RSP: 0018:ffff92f121e85c60 EFLAGS: 00010297 PKRU: 55555554 RAX: 0000000000000040 RBX: ffff92ea50689700 RCX: ffffffffc0330870 RDX: 0000000000000001 RSI: 00000001145a90ce RDI: ffff92ea50689700 RBP: ffffffffc0358a80 R08: 00000001145a910d R09: 0000000000000000 R10: 0000000000000001 R11: ffff92ea414c0088 R12: 0000000000000040 R13: 0000000000000018 R14: 00000001145a90ce R15: ffff92ea50689700 FS: 0000000000000000(0000) GS:ffff92f121e80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000000002a CR3: 00000003e6810005 CR4: 00000000007706e0 PKRU: 55555554 Call Trace: <IRQ> efx_xdp_tx_buffers+0x12b/0x3d0 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5] __efx_rx_packet+0x5c3/0x930 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5] efx_rx_packet+0x28c/0x2e0 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5] efx_ef10_ev_process+0x5f8/0xf40 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5] ? enqueue_task_fair+0x95/0x550 efx_poll+0xc4/0x360 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3990a8fffbdad5765f47ea593f9de66c91762059 , < ed7a824fda8732578d1014fad1f7fb0363705090 (git)
Affected: 3990a8fffbdad5765f47ea593f9de66c91762059 , < b8c46bc358d84701e7f7ffa054037db25f25da0e (git)
Affected: 3990a8fffbdad5765f47ea593f9de66c91762059 , < dcc85e1593686e42c6749ef3d356db34759d59e8 (git)
Affected: 3990a8fffbdad5765f47ea593f9de66c91762059 , < 059a47f1da93811d37533556d67e72f2261b1127 (git)
Create a notification for this product.
    Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.15.34 , ≤ 5.15.* (semver)
Unaffected: 5.16.20 , ≤ 5.16.* (semver)
Unaffected: 5.17.3 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
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              "content": {
                "id": "CVE-2022-49096",
                "options": [
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                    "Exploitation": "none"
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                    "Automatable": "no"
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                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:49:29.340028Z",
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sfc: add missing xdp queue reinitialization\n\nAfter rx/tx ring buffer size is changed, kernel panic occurs when\nit acts XDP_TX or XDP_REDIRECT.\n\nWhen tx/rx ring buffer size is changed(ethtool -G), sfc driver\nreallocates and reinitializes rx and tx queues and their buffer\n(tx_queue-\u003ebuffer).\nBut it misses reinitializing xdp queues(efx-\u003exdp_tx_queues).\nSo, while it is acting XDP_TX or XDP_REDIRECT, it uses the uninitialized\ntx_queue-\u003ebuffer.\n\nA new function efx_set_xdp_channels() is separated from efx_set_channels()\nto handle only xdp queues.\n\nSplat looks like:\n   BUG: kernel NULL pointer dereference, address: 000000000000002a\n   #PF: supervisor write access in kernel mode\n   #PF: error_code(0x0002) - not-present page\n   PGD 0 P4D 0\n   Oops: 0002 [#4] PREEMPT SMP NOPTI\n   RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc]\n   CPU: 2 PID: 0 Comm: swapper/2 Tainted: G      D           5.17.0+ #55 e8beeee8289528f11357029357cf\n   Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80\n   RSP: 0018:ffff92f121e45c60 EFLAGS: 00010297\n   RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc]\n   RAX: 0000000000000040 RBX: ffff92ea506895c0 RCX: ffffffffc0330870\n   RDX: 0000000000000001 RSI: 00000001139b10ce RDI: ffff92ea506895c0\n   RBP: ffffffffc0358a80 R08: 00000001139b110d R09: 0000000000000000\n   R10: 0000000000000001 R11: ffff92ea414c0088 R12: 0000000000000040\n   R13: 0000000000000018 R14: 00000001139b10ce R15: ffff92ea506895c0\n   FS:  0000000000000000(0000) GS:ffff92f121ec0000(0000) knlGS:0000000000000000\n   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n   Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80\n   CR2: 000000000000002a CR3: 00000003e6810004 CR4: 00000000007706e0\n   RSP: 0018:ffff92f121e85c60 EFLAGS: 00010297\n   PKRU: 55555554\n   RAX: 0000000000000040 RBX: ffff92ea50689700 RCX: ffffffffc0330870\n   RDX: 0000000000000001 RSI: 00000001145a90ce RDI: ffff92ea50689700\n   RBP: ffffffffc0358a80 R08: 00000001145a910d R09: 0000000000000000\n   R10: 0000000000000001 R11: ffff92ea414c0088 R12: 0000000000000040\n   R13: 0000000000000018 R14: 00000001145a90ce R15: ffff92ea50689700\n   FS:  0000000000000000(0000) GS:ffff92f121e80000(0000) knlGS:0000000000000000\n   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n   CR2: 000000000000002a CR3: 00000003e6810005 CR4: 00000000007706e0\n   PKRU: 55555554\n   Call Trace:\n    \u003cIRQ\u003e\n    efx_xdp_tx_buffers+0x12b/0x3d0 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]\n    __efx_rx_packet+0x5c3/0x930 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]\n    efx_rx_packet+0x28c/0x2e0 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]\n    efx_ef10_ev_process+0x5f8/0xf40 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]\n    ? enqueue_task_fair+0x95/0x550\n    efx_poll+0xc4/0x360 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]"
        }
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      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:29:48.329Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ed7a824fda8732578d1014fad1f7fb0363705090"
        },
        {
          "url": "https://git.kernel.org/stable/c/b8c46bc358d84701e7f7ffa054037db25f25da0e"
        },
        {
          "url": "https://git.kernel.org/stable/c/dcc85e1593686e42c6749ef3d356db34759d59e8"
        },
        {
          "url": "https://git.kernel.org/stable/c/059a47f1da93811d37533556d67e72f2261b1127"
        }
      ],
      "title": "net: sfc: add missing xdp queue reinitialization",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49096",
    "datePublished": "2025-02-26T01:54:49.108Z",
    "dateReserved": "2025-02-26T01:49:39.249Z",
    "dateUpdated": "2025-10-01T19:57:05.717Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"cna\": {\"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:29:48.329Z\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: sfc: add missing xdp queue reinitialization\\n\\nAfter rx/tx ring buffer size is changed, kernel panic occurs when\\nit acts XDP_TX or XDP_REDIRECT.\\n\\nWhen tx/rx ring buffer size is changed(ethtool -G), sfc driver\\nreallocates and reinitializes rx and tx queues and their buffer\\n(tx_queue-\u003ebuffer).\\nBut it misses reinitializing xdp queues(efx-\u003exdp_tx_queues).\\nSo, while it is acting XDP_TX or XDP_REDIRECT, it uses the uninitialized\\ntx_queue-\u003ebuffer.\\n\\nA new function efx_set_xdp_channels() is separated from efx_set_channels()\\nto handle only xdp queues.\\n\\nSplat looks like:\\n   BUG: kernel NULL pointer dereference, address: 000000000000002a\\n   #PF: supervisor write access in kernel mode\\n   #PF: error_code(0x0002) - not-present page\\n   PGD 0 P4D 0\\n   Oops: 0002 [#4] PREEMPT SMP NOPTI\\n   RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc]\\n   CPU: 2 PID: 0 Comm: swapper/2 Tainted: G      D           5.17.0+ #55 e8beeee8289528f11357029357cf\\n   Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80\\n   RSP: 0018:ffff92f121e45c60 EFLAGS: 00010297\\n   RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc]\\n   RAX: 0000000000000040 RBX: ffff92ea506895c0 RCX: ffffffffc0330870\\n   RDX: 0000000000000001 RSI: 00000001139b10ce RDI: ffff92ea506895c0\\n   RBP: ffffffffc0358a80 R08: 00000001139b110d R09: 0000000000000000\\n   R10: 0000000000000001 R11: ffff92ea414c0088 R12: 0000000000000040\\n   R13: 0000000000000018 R14: 00000001139b10ce R15: ffff92ea506895c0\\n   FS:  0000000000000000(0000) GS:ffff92f121ec0000(0000) knlGS:0000000000000000\\n   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n   Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80\\n   CR2: 000000000000002a CR3: 00000003e6810004 CR4: 00000000007706e0\\n   RSP: 0018:ffff92f121e85c60 EFLAGS: 00010297\\n   PKRU: 55555554\\n   RAX: 0000000000000040 RBX: ffff92ea50689700 RCX: ffffffffc0330870\\n   RDX: 0000000000000001 RSI: 00000001145a90ce RDI: ffff92ea50689700\\n   RBP: ffffffffc0358a80 R08: 00000001145a910d R09: 0000000000000000\\n   R10: 0000000000000001 R11: ffff92ea414c0088 R12: 0000000000000040\\n   R13: 0000000000000018 R14: 00000001145a90ce R15: ffff92ea50689700\\n   FS:  0000000000000000(0000) GS:ffff92f121e80000(0000) knlGS:0000000000000000\\n   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n   CR2: 000000000000002a CR3: 00000003e6810005 CR4: 00000000007706e0\\n   PKRU: 55555554\\n   Call Trace:\\n    \u003cIRQ\u003e\\n    efx_xdp_tx_buffers+0x12b/0x3d0 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]\\n    __efx_rx_packet+0x5c3/0x930 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]\\n    efx_rx_packet+0x28c/0x2e0 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]\\n    efx_ef10_ev_process+0x5f8/0xf40 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]\\n    ? enqueue_task_fair+0x95/0x550\\n    efx_poll+0xc4/0x360 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]\"}], \"affected\": [{\"product\": \"Linux\", \"vendor\": \"Linux\", \"defaultStatus\": \"unaffected\", \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"programFiles\": [\"drivers/net/ethernet/sfc/efx_channels.c\"], \"versions\": [{\"version\": \"3990a8fffbdad5765f47ea593f9de66c91762059\", \"lessThan\": \"ed7a824fda8732578d1014fad1f7fb0363705090\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"3990a8fffbdad5765f47ea593f9de66c91762059\", \"lessThan\": \"b8c46bc358d84701e7f7ffa054037db25f25da0e\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"3990a8fffbdad5765f47ea593f9de66c91762059\", \"lessThan\": \"dcc85e1593686e42c6749ef3d356db34759d59e8\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"3990a8fffbdad5765f47ea593f9de66c91762059\", \"lessThan\": \"059a47f1da93811d37533556d67e72f2261b1127\", \"status\": \"affected\", \"versionType\": \"git\"}]}, {\"product\": \"Linux\", \"vendor\": \"Linux\", \"defaultStatus\": \"affected\", \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"programFiles\": [\"drivers/net/ethernet/sfc/efx_channels.c\"], \"versions\": [{\"version\": \"5.5\", \"status\": \"affected\"}, {\"version\": \"0\", \"lessThan\": \"5.5\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"5.15.34\", \"lessThanOrEqual\": \"5.15.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"5.16.20\", \"lessThanOrEqual\": \"5.16.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"5.17.3\", \"lessThanOrEqual\": \"5.17.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"5.18\", \"lessThanOrEqual\": \"*\", \"status\": \"unaffected\", \"versionType\": \"original_commit_for_fix\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.5\", \"versionEndExcluding\": \"5.15.34\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.5\", \"versionEndExcluding\": \"5.16.20\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.5\", \"versionEndExcluding\": \"5.17.3\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.5\", \"versionEndExcluding\": \"5.18\"}]}]}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/ed7a824fda8732578d1014fad1f7fb0363705090\"}, {\"url\": \"https://git.kernel.org/stable/c/b8c46bc358d84701e7f7ffa054037db25f25da0e\"}, {\"url\": \"https://git.kernel.org/stable/c/dcc85e1593686e42c6749ef3d356db34759d59e8\"}, {\"url\": \"https://git.kernel.org/stable/c/059a47f1da93811d37533556d67e72f2261b1127\"}], \"title\": \"net: sfc: add missing xdp queue reinitialization\", \"x_generator\": {\"engine\": \"bippy-1.2.0\"}}, \"adp\": [{\"metrics\": [{\"cvssV3_1\": {\"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\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49096\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T19:49:29.340028Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2025-10-01T16:04:51.192Z\"}, \"title\": \"CISA ADP Vulnrichment\"}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49096\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Linux\", \"dateReserved\": \"2025-02-26T01:49:39.249Z\", \"datePublished\": \"2025-02-26T01:54:49.108Z\", \"dateUpdated\": \"2025-05-04T08:29:48.329Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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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.



Detection rules are retrieved from Rulezet.