{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "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": "2026-08-05T08:53:55.150Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:53:55.150Z" }, "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->buffer).\nBut it misses reinitializing xdp queues(efx->xdp_tx_queues).\nSo, while it is acting XDP_TX or XDP_REDIRECT, it uses the uninitialized\ntx_queue->buffer.\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 \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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable state is created only via local ethtool ring-parameter changes (ETHTOOL_SRINGPARAM / ETHTOOL_MSG_RINGS_SET → 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->xdp_tx_queues retains pointers into kfree'd 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." } ] } ], "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" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T19:57:05.717Z" } } ] } }