CVE-2021-47127

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47127", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-03-04T18:12:48.839Z", "datePublished": "2024-03-15T20:14:31.658Z", "dateUpdated": "2026-05-11T13:48:34.169Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:48:34.169Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nice: track AF_XDP ZC enabled queues in bitmap\n\nCommit c7a219048e45 (\"ice: Remove xsk_buff_pool from VSI structure\")\nsilently introduced a regression and broke the Tx side of AF_XDP in copy\nmode. xsk_pool on ice_ring is set only based on the existence of the XDP\nprog on the VSI which in turn picks ice_clean_tx_irq_zc to be executed.\nThat is not something that should happen for copy mode as it should use\nthe regular data path ice_clean_tx_irq.\n\nThis results in a following splat when xdpsock is run in txonly or l2fwd\nscenarios in copy mode:\n\n<snip>\n[ 106.050195] BUG: kernel NULL pointer dereference, address: 0000000000000030\n[ 106.057269] #PF: supervisor read access in kernel mode\n[ 106.062493] #PF: error_code(0x0000) - not-present page\n[ 106.067709] PGD 0 P4D 0\n[ 106.070293] Oops: 0000 [#1] PREEMPT SMP NOPTI\n[ 106.074721] CPU: 61 PID: 0 Comm: swapper/61 Not tainted 5.12.0-rc2+ #45\n[ 106.081436] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[ 106.092027] RIP: 0010:xp_raw_get_dma+0x36/0x50\n[ 106.096551] Code: 74 14 48 b8 ff ff ff ff ff ff 00 00 48 21 f0 48 c1 ee 30 48 01 c6 48 8b 87 90 00 00 00 48 89 f2 81 e6 ff 0f 00 00 48 c1 ea 0c <48> 8b 04 d0 48 83 e0 fe 48 01 f0 c3 66 66 2e 0f 1f 84 00 00 00 00\n[ 106.115588] RSP: 0018:ffffc9000d694e50 EFLAGS: 00010206\n[ 106.120893] RAX: 0000000000000000 RBX: ffff88984b8c8a00 RCX: ffff889852581800\n[ 106.128137] RDX: 0000000000000006 RSI: 0000000000000000 RDI: ffff88984cd8b800\n[ 106.135383] RBP: ffff888123b50001 R08: ffff889896800000 R09: 0000000000000800\n[ 106.142628] R10: 0000000000000000 R11: ffffffff826060c0 R12: 00000000000000ff\n[ 106.149872] R13: 0000000000000000 R14: 0000000000000040 R15: ffff888123b50018\n[ 106.157117] FS: 0000000000000000(0000) GS:ffff8897e0f40000(0000) knlGS:0000000000000000\n[ 106.165332] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 106.171163] CR2: 0000000000000030 CR3: 000000000560a004 CR4: 00000000007706e0\n[ 106.178408] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 106.185653] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ 106.192898] PKRU: 55555554\n[ 106.195653] Call Trace:\n[ 106.198143] <IRQ>\n[ 106.200196] ice_clean_tx_irq_zc+0x183/0x2a0 [ice]\n[ 106.205087] ice_napi_poll+0x3e/0x590 [ice]\n[ 106.209356] __napi_poll+0x2a/0x160\n[ 106.212911] net_rx_action+0xd6/0x200\n[ 106.216634] __do_softirq+0xbf/0x29b\n[ 106.220274] irq_exit_rcu+0x88/0xc0\n[ 106.223819] common_interrupt+0x7b/0xa0\n[ 106.227719] </IRQ>\n[ 106.229857] asm_common_interrupt+0x1e/0x40\n</snip>\n\nFix this by introducing the bitmap of queues that are zero-copy enabled,\nwhere each bit, corresponding to a queue id that xsk pool is being\nconfigured on, will be set/cleared within ice_xsk_pool_{en,dis}able and\nchecked within ice_xsk_pool(). The latter is a function used for\ndeciding which napi poll routine is executed.\nIdea is being taken from our other drivers such as i40e and ixgbe."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/intel/ice/ice.h", "drivers/net/ethernet/intel/ice/ice_lib.c", "drivers/net/ethernet/intel/ice/ice_xsk.c"], "versions": [{"version": "c7a219048e459cf99c6fec0f7c1e42414e9e6202", "lessThan": "1d34fa4fcf06649036ba0c97854fcf7a741ee18c", "status": "affected", "versionType": "git"}, {"version": "c7a219048e459cf99c6fec0f7c1e42414e9e6202", "lessThan": "e102db780e1c14f10c70dafa7684af22a745b51d", "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/intel/ice/ice.h", "drivers/net/ethernet/intel/ice/ice_lib.c", "drivers/net/ethernet/intel/ice/ice_xsk.c"], "versions": [{"version": "5.12", "status": "affected"}, {"version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver"}, {"version": "5.12.10", "lessThanOrEqual": "5.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.13", "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": "5.12", "versionEndExcluding": "5.12.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "5.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1d34fa4fcf06649036ba0c97854fcf7a741ee18c"}, {"url": "https://git.kernel.org/stable/c/e102db780e1c14f10c70dafa7684af22a745b51d"}], "title": "ice: track AF_XDP ZC enabled queues in bitmap", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:24:39.881Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/1d34fa4fcf06649036ba0c97854fcf7a741ee18c", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/e102db780e1c14f10c70dafa7684af22a745b51d", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47127", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:55:26.106391Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:32:52.269Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/1d34fa4fcf06649036ba0c97854fcf7a741ee18c", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/e102db780e1c14f10c70dafa7684af22a745b51d", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:24:39.881Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47127", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:55:26.106391Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T12:42:13.166Z"}}], "cna": {"title": "ice: track AF_XDP ZC enabled queues in bitmap", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "c7a219048e459cf99c6fec0f7c1e42414e9e6202", "lessThan": "1d34fa4fcf06649036ba0c97854fcf7a741ee18c", "versionType": "git"}, {"status": "affected", "version": "c7a219048e459cf99c6fec0f7c1e42414e9e6202", "lessThan": "e102db780e1c14f10c70dafa7684af22a745b51d", "versionType": "git"}], "programFiles": ["drivers/net/ethernet/intel/ice/ice.h", "drivers/net/ethernet/intel/ice/ice_lib.c", "drivers/net/ethernet/intel/ice/ice_xsk.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.12"}, {"status": "unaffected", "version": "0", "lessThan": "5.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.12.10", "versionType": "semver", "lessThanOrEqual": "5.12.*"}, {"status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/ethernet/intel/ice/ice.h", "drivers/net/ethernet/intel/ice/ice_lib.c", "drivers/net/ethernet/intel/ice/ice_xsk.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/1d34fa4fcf06649036ba0c97854fcf7a741ee18c"}, {"url": "https://git.kernel.org/stable/c/e102db780e1c14f10c70dafa7684af22a745b51d"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nice: track AF_XDP ZC enabled queues in bitmap\n\nCommit c7a219048e45 (\"ice: Remove xsk_buff_pool from VSI structure\")\nsilently introduced a regression and broke the Tx side of AF_XDP in copy\nmode. xsk_pool on ice_ring is set only based on the existence of the XDP\nprog on the VSI which in turn picks ice_clean_tx_irq_zc to be executed.\nThat is not something that should happen for copy mode as it should use\nthe regular data path ice_clean_tx_irq.\n\nThis results in a following splat when xdpsock is run in txonly or l2fwd\nscenarios in copy mode:\n\n<snip>\n[ 106.050195] BUG: kernel NULL pointer dereference, address: 0000000000000030\n[ 106.057269] #PF: supervisor read access in kernel mode\n[ 106.062493] #PF: error_code(0x0000) - not-present page\n[ 106.067709] PGD 0 P4D 0\n[ 106.070293] Oops: 0000 [#1] PREEMPT SMP NOPTI\n[ 106.074721] CPU: 61 PID: 0 Comm: swapper/61 Not tainted 5.12.0-rc2+ #45\n[ 106.081436] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[ 106.092027] RIP: 0010:xp_raw_get_dma+0x36/0x50\n[ 106.096551] Code: 74 14 48 b8 ff ff ff ff ff ff 00 00 48 21 f0 48 c1 ee 30 48 01 c6 48 8b 87 90 00 00 00 48 89 f2 81 e6 ff 0f 00 00 48 c1 ea 0c <48> 8b 04 d0 48 83 e0 fe 48 01 f0 c3 66 66 2e 0f 1f 84 00 00 00 00\n[ 106.115588] RSP: 0018:ffffc9000d694e50 EFLAGS: 00010206\n[ 106.120893] RAX: 0000000000000000 RBX: ffff88984b8c8a00 RCX: ffff889852581800\n[ 106.128137] RDX: 0000000000000006 RSI: 0000000000000000 RDI: ffff88984cd8b800\n[ 106.135383] RBP: ffff888123b50001 R08: ffff889896800000 R09: 0000000000000800\n[ 106.142628] R10: 0000000000000000 R11: ffffffff826060c0 R12: 00000000000000ff\n[ 106.149872] R13: 0000000000000000 R14: 0000000000000040 R15: ffff888123b50018\n[ 106.157117] FS: 0000000000000000(0000) GS:ffff8897e0f40000(0000) knlGS:0000000000000000\n[ 106.165332] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 106.171163] CR2: 0000000000000030 CR3: 000000000560a004 CR4: 00000000007706e0\n[ 106.178408] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 106.185653] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ 106.192898] PKRU: 55555554\n[ 106.195653] Call Trace:\n[ 106.198143] <IRQ>\n[ 106.200196] ice_clean_tx_irq_zc+0x183/0x2a0 [ice]\n[ 106.205087] ice_napi_poll+0x3e/0x590 [ice]\n[ 106.209356] __napi_poll+0x2a/0x160\n[ 106.212911] net_rx_action+0xd6/0x200\n[ 106.216634] __do_softirq+0xbf/0x29b\n[ 106.220274] irq_exit_rcu+0x88/0xc0\n[ 106.223819] common_interrupt+0x7b/0xa0\n[ 106.227719] </IRQ>\n[ 106.229857] asm_common_interrupt+0x1e/0x40\n</snip>\n\nFix this by introducing the bitmap of queues that are zero-copy enabled,\nwhere each bit, corresponding to a queue id that xsk pool is being\nconfigured on, will be set/cleared within ice_xsk_pool_{en,dis}able and\nchecked within ice_xsk_pool(). The latter is a function used for\ndeciding which napi poll routine is executed.\nIdea is being taken from our other drivers such as i40e and ixgbe."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.12.10", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.13", "versionStartIncluding": "5.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T07:04:40.408Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47127", "state": "PUBLISHED", "dateUpdated": "2025-05-04T07:04:40.408Z", "dateReserved": "2024-03-04T18:12:48.839Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-03-15T20:14:31.658Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/intel/ice/ice.h", "drivers/net/ethernet/intel/ice/ice_lib.c", "drivers/net/ethernet/intel/ice/ice_xsk.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1d34fa4fcf06649036ba0c97854fcf7a741ee18c", "status": "affected", "version": "c7a219048e459cf99c6fec0f7c1e42414e9e6202", "versionType": "git"}, {"lessThan": "e102db780e1c14f10c70dafa7684af22a745b51d", "status": "affected", "version": "c7a219048e459cf99c6fec0f7c1e42414e9e6202", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/intel/ice/ice.h", "drivers/net/ethernet/intel/ice/ice_lib.c", "drivers/net/ethernet/intel/ice/ice_xsk.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.12"}, {"lessThan": "5.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.12.*", "status": "unaffected", "version": "5.12.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C68A4290-9FFF-4037-9467-4FF878E3085F", "versionEndExcluding": "5.12.10", "versionStartIncluding": "5.12", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*", "matchCriteriaId": "96AC23B2-D46A-49D9-8203-8E1BEDCA8532", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*", "matchCriteriaId": "DA610E30-717C-4700-9F77-A3C9244F3BFD", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*", "matchCriteriaId": "1ECD33F5-85BE-430B-8F86-8D7BD560311D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nice: track AF_XDP ZC enabled queues in bitmap\n\nCommit c7a219048e45 (\"ice: Remove xsk_buff_pool from VSI structure\")\nsilently introduced a regression and broke the Tx side of AF_XDP in copy\nmode. xsk_pool on ice_ring is set only based on the existence of the XDP\nprog on the VSI which in turn picks ice_clean_tx_irq_zc to be executed.\nThat is not something that should happen for copy mode as it should use\nthe regular data path ice_clean_tx_irq.\n\nThis results in a following splat when xdpsock is run in txonly or l2fwd\nscenarios in copy mode:\n\n<snip>\n[ 106.050195] BUG: kernel NULL pointer dereference, address: 0000000000000030\n[ 106.057269] #PF: supervisor read access in kernel mode\n[ 106.062493] #PF: error_code(0x0000) - not-present page\n[ 106.067709] PGD 0 P4D 0\n[ 106.070293] Oops: 0000 [#1] PREEMPT SMP NOPTI\n[ 106.074721] CPU: 61 PID: 0 Comm: swapper/61 Not tainted 5.12.0-rc2+ #45\n[ 106.081436] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[ 106.092027] RIP: 0010:xp_raw_get_dma+0x36/0x50\n[ 106.096551] Code: 74 14 48 b8 ff ff ff ff ff ff 00 00 48 21 f0 48 c1 ee 30 48 01 c6 48 8b 87 90 00 00 00 48 89 f2 81 e6 ff 0f 00 00 48 c1 ea 0c <48> 8b 04 d0 48 83 e0 fe 48 01 f0 c3 66 66 2e 0f 1f 84 00 00 00 00\n[ 106.115588] RSP: 0018:ffffc9000d694e50 EFLAGS: 00010206\n[ 106.120893] RAX: 0000000000000000 RBX: ffff88984b8c8a00 RCX: ffff889852581800\n[ 106.128137] RDX: 0000000000000006 RSI: 0000000000000000 RDI: ffff88984cd8b800\n[ 106.135383] RBP: ffff888123b50001 R08: ffff889896800000 R09: 0000000000000800\n[ 106.142628] R10: 0000000000000000 R11: ffffffff826060c0 R12: 00000000000000ff\n[ 106.149872] R13: 0000000000000000 R14: 0000000000000040 R15: ffff888123b50018\n[ 106.157117] FS: 0000000000000000(0000) GS:ffff8897e0f40000(0000) knlGS:0000000000000000\n[ 106.165332] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 106.171163] CR2: 0000000000000030 CR3: 000000000560a004 CR4: 00000000007706e0\n[ 106.178408] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 106.185653] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ 106.192898] PKRU: 55555554\n[ 106.195653] Call Trace:\n[ 106.198143] <IRQ>\n[ 106.200196] ice_clean_tx_irq_zc+0x183/0x2a0 [ice]\n[ 106.205087] ice_napi_poll+0x3e/0x590 [ice]\n[ 106.209356] __napi_poll+0x2a/0x160\n[ 106.212911] net_rx_action+0xd6/0x200\n[ 106.216634] __do_softirq+0xbf/0x29b\n[ 106.220274] irq_exit_rcu+0x88/0xc0\n[ 106.223819] common_interrupt+0x7b/0xa0\n[ 106.227719] </IRQ>\n[ 106.229857] asm_common_interrupt+0x1e/0x40\n</snip>\n\nFix this by introducing the bitmap of queues that are zero-copy enabled,\nwhere each bit, corresponding to a queue id that xsk pool is being\nconfigured on, will be set/cleared within ice_xsk_pool_{en,dis}able and\nchecked within ice_xsk_pool(). The latter is a function used for\ndeciding which napi poll routine is executed.\nIdea is being taken from our other drivers such as i40e and ixgbe."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ice: rastrear colas habilitadas para AF_XDP ZC en mapa de bits. El commit c7a219048e45 (\"ice: Remove xsk_buff_pool from VSI Structure\") introdujo silenciosamente una regresi\u00f3n y rompi\u00f3 el lado Tx de AF_XDP en modo de copia. xsk_pool en ice_ring se configura \u00fanicamente en funci\u00f3n de la existencia del programa XDP en la VSI, que a su vez selecciona ice_clean_tx_irq_zc para ejecutarse. Eso no es algo que deber\u00eda suceder en el modo de copia, ya que deber\u00eda usar la ruta de datos normal ice_clean_tx_irq. Esto da como resultado el siguiente s\u00edmbolo cuando xdpsock se ejecuta en escenarios txonly o l2fwd en modo copia: [ 106.050195] ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 00000000000000030 [ 106.057269] #PF: acceso de lectura del supervisor en modo kernel [ 106.062493] #PF: error_code(0x0000) - p\u00e1gina no presente [106.067709] PGD 0 P4D 0 [106.070293] Ups: 0000 [#1] PREEMPT SMP NOPTI [106.074721] CPU: 61 PID: 0 Comm: swapper/61 No contaminado 5.12. 0-rc2+ #45 [ 106.081436] Nombre de hardware: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 19/03/2019 [ 106.092027] RIP: 0010:xp_raw_get_dma+0x3 6/0x50 [ 106.096551] C\u00f3digo: 74 14 48 b8 ff ff ff ff ff ff 00 00 48 21 f0 48 c1 ee 30 48 01 c6 48 8b 87 90 00 00 00 48 89 f2 81 e6 ff 0f 00 00 48 c1 ea 0c &lt;48&gt; 8b 04 d0 48 83 e0 fe 4 8 01 f0 c3 66 66 2e 0f 1f 84 00 00 00 00 [ 106.115588] RSP: 0018:ffffc9000d694e50 EFLAGS: 00010206 [ 106.120893] RAX: 0000000000000000 RBX: ffff88984b8c8a00 RCX: ffff889852581800 [ 106.128137] RDX: 0000000000000006 RSI: 000000000000000000 RDI: ffff88984cd8b800 [ 106.135383 ] RBP: ffff888123b50001 R08: ffff889896800000 R09: 0000000000000800 [ 106.142628] R10: 00000000000000000 R11: ffffffff826060c0 R12: 00000000 000000ff [ 106.149872] R13: 0000000000000000 R14: 0000000000000040 R15: ffff888123b50018 [ 106.157117] FS: 0000000000000000(0000) GS:ffff8 897e0f40000(0000) knlGS :0000000000000000 [ 106.165332] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 106.171163] CR2: 0000000000000030 CR3: 000000000560a004 CR4: 00000000007706e0 [ 106.178408] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 00000000000000000 [ 106.185653] DR3: 0000000000000000 0 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 106.192898] PKRU: 55555554 [ 106.195653] Seguimiento de llamadas: [ 106.198143] [ 106.200196] ice_clean_tx_irq_zc+0x183/0x2a0 [ice] [ 106 .205087] ice_napi_poll+0x3e/0x590 [hielo] [ 106.209356] __napi_poll+0x2a/ 0x160 [ 106.212911] net_rx_action+0xd6/0x200 [ 106.216634] __do_softirq+0xbf/0x29b [ 106.220274] irq_exit_rcu+0x88/0xc0 [ 106.223819] common_interrupt+0x7b/0xa0 [ 106.227719] [ 106.229857] asm_common_interrupt+0x1e/0x40 Solucione este problema introduciendo el mapa de bits de las colas que est\u00e1n habilitadas para copia cero, donde cada bit, correspondiente a una identificaci\u00f3n de cola en la que se est\u00e1 configurando el grupo xsk, se establecer\u00e1/borrar\u00e1 dentro de ice_xsk_pool_{en,dis}able y se verificar\u00e1 dentro ice_xsk_pool(). Esta \u00faltima es una funci\u00f3n utilizada para decidir qu\u00e9 rutina de encuesta napi se ejecuta. La idea se ha tomado de nuestros otros controladores, como i40e e ixgbe."}], "id": "CVE-2021-47127", "lastModified": "2026-06-17T04:16:35.460", "metrics": {"cvssMetricV31": [{"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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47127", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:55:26.106391Z", "version": "2.0.3"}}]}, "published": "2024-03-15T21:15:07.417", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1d34fa4fcf06649036ba0c97854fcf7a741ee18c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e102db780e1c14f10c70dafa7684af22a745b51d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1d34fa4fcf06649036ba0c97854fcf7a741ee18c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e102db780e1c14f10c70dafa7684af22a745b51d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ice: track AF_XDP ZC enabled queues in bitmap", "id": "2269834", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2269834"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nice: track AF_XDP ZC enabled queues in bitmap\nCommit c7a219048e45 (\"ice: Remove xsk_buff_pool from VSI structure\")\nsilently introduced a regression and broke the Tx side of AF_XDP in copy\nmode. xsk_pool on ice_ring is set only based on the existence of the XDP\nprog on the VSI which in turn picks ice_clean_tx_irq_zc to be executed.\nThat is not something that should happen for copy mode as it should use\nthe regular data path ice_clean_tx_irq.\nThis results in a following splat when xdpsock is run in txonly or l2fwd\nscenarios in copy mode:\n<snip>\n[ 106.050195] BUG: kernel NULL pointer dereference, address: 0000000000000030\n[ 106.057269] #PF: supervisor read access in kernel mode\n[ 106.062493] #PF: error_code(0x0000) - not-present page\n[ 106.067709] PGD 0 P4D 0\n[ 106.070293] Oops: 0000 [#1] PREEMPT SMP NOPTI\n[ 106.074721] CPU: 61 PID: 0 Comm: swapper/61 Not tainted 5.12.0-rc2+ #45\n[ 106.081436] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[ 106.092027] RIP: 0010:xp_raw_get_dma+0x36/0x50\n[ 106.096551] Code: 74 14 48 b8 ff ff ff ff ff ff 00 00 48 21 f0 48 c1 ee 30 48 01 c6 48 8b 87 90 00 00 00 48 89 f2 81 e6 ff 0f 00 00 48 c1 ea 0c <48> 8b 04 d0 48 83 e0 fe 48 01 f0 c3 66 66 2e 0f 1f 84 00 00 00 00\n[ 106.115588] RSP: 0018:ffffc9000d694e50 EFLAGS: 00010206\n[ 106.120893] RAX: 0000000000000000 RBX: ffff88984b8c8a00 RCX: ffff889852581800\n[ 106.128137] RDX: 0000000000000006 RSI: 0000000000000000 RDI: ffff88984cd8b800\n[ 106.135383] RBP: ffff888123b50001 R08: ffff889896800000 R09: 0000000000000800\n[ 106.142628] R10: 0000000000000000 R11: ffffffff826060c0 R12: 00000000000000ff\n[ 106.149872] R13: 0000000000000000 R14: 0000000000000040 R15: ffff888123b50018\n[ 106.157117] FS: 0000000000000000(0000) GS:ffff8897e0f40000(0000) knlGS:0000000000000000\n[ 106.165332] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 106.171163] CR2: 0000000000000030 CR3: 000000000560a004 CR4: 00000000007706e0\n[ 106.178408] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 106.185653] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ 106.192898] PKRU: 55555554\n[ 106.195653] Call Trace:\n[ 106.198143] <IRQ>\n[ 106.200196] ice_clean_tx_irq_zc+0x183/0x2a0 [ice]\n[ 106.205087] ice_napi_poll+0x3e/0x590 [ice]\n[ 106.209356] __napi_poll+0x2a/0x160\n[ 106.212911] net_rx_action+0xd6/0x200\n[ 106.216634] __do_softirq+0xbf/0x29b\n[ 106.220274] irq_exit_rcu+0x88/0xc0\n[ 106.223819] common_interrupt+0x7b/0xa0\n[ 106.227719] </IRQ>\n[ 106.229857] asm_common_interrupt+0x1e/0x40\n</snip>\nFix this by introducing the bitmap of queues that are zero-copy enabled,\nwhere each bit, corresponding to a queue id that xsk pool is being\nconfigured on, will be set/cleared within ice_xsk_pool_{en,dis}able and\nchecked within ice_xsk_pool(). The latter is a function used for\ndeciding which napi poll routine is executed.\nIdea is being taken from our other drivers such as i40e and ixgbe."], "name": "CVE-2021-47127", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-03-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47127\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47127\nhttps://lore.kernel.org/linux-cve-announce/2024031512-CVE-2021-47127-d0d6@gregkh/T/#u"], "threat_severity": "Moderate"}

{}