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

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2026-08-05 08:53
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
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:49 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3990a8fffbdad5765f47ea593f9de66c91762059 , < ed7a824fda8732578d1014fad1f7fb0363705090 (git)
Affected: 3990a8fffbdad5765f47ea593f9de66c91762059 , < b8c46bc358d84701e7f7ffa054037db25f25da0e (git)
Affected: 3990a8fffbdad5765f47ea593f9de66c91762059 , < dcc85e1593686e42c6749ef3d356db34759d59e8 (git)
Affected: 3990a8fffbdad5765f47ea593f9de66c91762059 , < 059a47f1da93811d37533556d67e72f2261b1127 (git)
guessed 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)
guessed Create a notification for this product.
Show details on NVD website
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          "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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              "value": "AV:L - The vulnerable state is created only via local ethtool ring-parameter changes (ETHTOOL_SRINGPARAM / ETHTOOL_MSG_RINGS_SET \u2192 efx_realloc_channels). Remote packets merely exercise the already-dangling XDP TX queue pointers after that local reconfiguration.\nAC:L - A local attacker who can change ring parameters (and who can rely on or attach an XDP program that returns XDP_TX/XDP_REDIRECT) can reliably provoke the stale xdp_tx_queues use; this is a deterministic post-realloc UAF, not a race or otherwise attacker-uncontrollable condition.\nPR:L - Triggering the realloc path requires CAP_NET_ADMIN in the network namespace that owns the Solarflare device (ns_capable), which is available to low-privileged contexts such as containers granted CAP_NET_ADMIN, so Privileges Required is Low rather than High.\nUI:N - No separate victim action is required; the attacker (or automated privileged tooling they control) performs the ethtool reconfiguration and can generate or wait for traffic that hits XDP_TX/XDP_REDIRECT.\nS:U - Impact stays within the kernel/host security authority; this is a same-host driver memory-corruption/DoS issue, not a VM escape, IOMMU bypass, or other cross-boundary break.\nC:H - efx-\u003exdp_tx_queues retains pointers into kfree\u0027d channel/tx_queue objects, so the subsequent XDP TX path is a use-after-free that can be leveraged for arbitrary kernel memory disclosure via controlled reuse of the freed objects.\nI:H - The same UAF lets an attacker spray/reuse the freed tx_queue/channel memory and corrupt kernel state through efx_tx_map_chunk and related TX bookkeeping, enabling integrity compromise and control-flow hijacking primitives.\nA:H - The demonstrated failure is a kernel NULL-pointer dereference/oops in IRQ/NAPI context (efx_tx_map_chunk), and UAFs of this form also crash unpredictably when freed memory is reused, so availability impact is High."
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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]"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: sfc: add missing xdp queue reinitialization Despu\u00e9s de cambiar el tama\u00f1o del b\u00fafer de anillo rx/tx, se produce un p\u00e1nico del kernel cuando act\u00faa XDP_TX o XDP_REDIRECT. Cuando se cambia el tama\u00f1o del b\u00fafer de anillo tx/rx (ethtool -G), el controlador sfc reasigna y reinicializa las colas rx y tx y su b\u00fafer (tx_queue-\u0026gt;buffer). Pero no reinicializa las colas xdp (efx-\u0026gt;xdp_tx_queues). Por lo tanto, mientras act\u00faa XDP_TX o XDP_REDIRECT, utiliza el tx_queue-\u0026gt;buffer no inicializado. Una nueva funci\u00f3n efx_set_xdp_channels() est\u00e1 separada de efx_set_channels() para manejar solo las colas xdp. El problema se parece a esto: ERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 000000000000002a #PF: acceso de escritura del supervisor en modo kernel #PF: error_code(0x0002) - p\u00e1gina no presente 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: GD 5.17.0+ #55 e8beeee8289528f11357029357cf C\u00f3digo: 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: 000000000000040 RBX: ffff92ea506895c0 RCX: ffffffffc0330870 RDX: 0000000000000001 RSI: 00000001139b10ce RDI: ffff92ea506895c0 RBP: ffffffffc0358a80 R08: 00000001139b110d R09: 00000000000000000 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 C\u00f3digo: 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: 00000000000002a 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: 000000000000001 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: 000000080050033 CR2: 00000000000002a CR3: 00000003e6810005 CR4: 00000000007706e0 PKRU: 55555554 Rastreo de llamadas:  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]"
          }
        ],
        "id": "CVE-2022-49096",
        "lastModified": "2026-08-04T10:17:34.920",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "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"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            },
            {
              "cvssData": {
                "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"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2022-49096",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:49:29.340028Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2025-02-26T07:00:47.010",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/059a47f1da93811d37533556d67e72f2261b1127"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b8c46bc358d84701e7f7ffa054037db25f25da0e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/dcc85e1593686e42c6749ef3d356db34759d59e8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ed7a824fda8732578d1014fad1f7fb0363705090"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:44:55+00:00",
      "cve": "CVE-2022-49096",
      "id": "CVE-2022-49096",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: sfc: add missing xdp queue reinitialization",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49096.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "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"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2022-49096",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-10-01T19:49:29.340028Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-476",
                    "description": "CWE-476 NULL Pointer Dereference",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-10-01T16:04:51.192Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/ethernet/sfc/efx_channels.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "ed7a824fda8732578d1014fad1f7fb0363705090",
                  "status": "affected",
                  "version": "3990a8fffbdad5765f47ea593f9de66c91762059",
                  "versionType": "git"
                },
                {
                  "lessThan": "b8c46bc358d84701e7f7ffa054037db25f25da0e",
                  "status": "affected",
                  "version": "3990a8fffbdad5765f47ea593f9de66c91762059",
                  "versionType": "git"
                },
                {
                  "lessThan": "dcc85e1593686e42c6749ef3d356db34759d59e8",
                  "status": "affected",
                  "version": "3990a8fffbdad5765f47ea593f9de66c91762059",
                  "versionType": "git"
                },
                {
                  "lessThan": "059a47f1da93811d37533556d67e72f2261b1127",
                  "status": "affected",
                  "version": "3990a8fffbdad5765f47ea593f9de66c91762059",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/ethernet/sfc/efx_channels.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.5"
                },
                {
                  "lessThan": "5.5",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.34",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.16.*",
                  "status": "unaffected",
                  "version": "5.16.20",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.17.*",
                  "status": "unaffected",
                  "version": "5.17.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.18",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.34",
                      "versionStartIncluding": "5.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.16.20",
                      "versionStartIncluding": "5.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.17.3",
                      "versionStartIncluding": "5.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.18",
                      "versionStartIncluding": "5.5",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "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]"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerable state is created only via local ethtool ring-parameter changes (ETHTOOL_SRINGPARAM / ETHTOOL_MSG_RINGS_SET \u2192 efx_realloc_channels). Remote packets merely exercise the already-dangling XDP TX queue pointers after that local reconfiguration.\nAC:L - A local attacker who can change ring parameters (and who can rely on or attach an XDP program that returns XDP_TX/XDP_REDIRECT) can reliably provoke the stale xdp_tx_queues use; this is a deterministic post-realloc UAF, not a race or otherwise attacker-uncontrollable condition.\nPR:L - Triggering the realloc path requires CAP_NET_ADMIN in the network namespace that owns the Solarflare device (ns_capable), which is available to low-privileged contexts such as containers granted CAP_NET_ADMIN, so Privileges Required is Low rather than High.\nUI:N - No separate victim action is required; the attacker (or automated privileged tooling they control) performs the ethtool reconfiguration and can generate or wait for traffic that hits XDP_TX/XDP_REDIRECT.\nS:U - Impact stays within the kernel/host security authority; this is a same-host driver memory-corruption/DoS issue, not a VM escape, IOMMU bypass, or other cross-boundary break.\nC:H - efx-\u003exdp_tx_queues retains pointers into kfree\u0027d channel/tx_queue objects, so the subsequent XDP TX path is a use-after-free that can be leveraged for arbitrary kernel memory disclosure via controlled reuse of the freed objects.\nI:H - The same UAF lets an attacker spray/reuse the freed tx_queue/channel memory and corrupt kernel state through efx_tx_map_chunk and related TX bookkeeping, enabling integrity compromise and control-flow hijacking primitives.\nA:H - The demonstrated failure is a kernel NULL-pointer dereference/oops in IRQ/NAPI context (efx_tx_map_chunk), and UAFs of this form also crash unpredictably when freed memory is reused, so availability impact is High."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:53:55.150Z",
            "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"
          }
        }
      },
      "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": "2026-08-05T08:53:55.150Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.