{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-53151: rxrpc: Fix the ACK parser to extract the SACK table for parsing","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-53151","status":"final","version":"1","initial_release_date":"2026-06-25T08:38:36.187Z","current_release_date":"2026-06-28T06:39:33.520Z","revision_history":[{"date":"2026-06-25T08:38:36.187Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix the ACK parser to extract the SACK table for parsing\n\nFix modification of the received skbuff in rxrpc_input_soft_acks() and a\npotential incorrect access of the buffer in a fragmented UDP packet (the\npacket would probably have to be deliberately pre-generated as fragmented)\nwhen AF_RXRPC tries to extract the contents of the SACK table by copying\nout the contents of the SACK table into a buffer before attempting to parse\n\nAF_RXRPC assumes that it can just call skb_condense() and then validly\naccess the SACK table from skb->data and that it will be a flat buffer -\nbut skb_condense() can silently fail to do anything under some\ncircumstances.\n\nNote that whilst rxrpc_input_soft_acks() should be able to parse extended\nACKs, the rest of AF_RXRPC doesn't currently support that.\n\nFurther, there's then no need to call skb_condense() in rxrpc_input_ack(),\nso don't.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-53151 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-53151"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-53151"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/566c4c1244de50fbff1f89ff93c9d7b0fc256db4"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/224298450be5c04d2a6ea1c2a94669d7ebf65d00"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/333b6d5bb9f87827ac2639c737bf9613dbae7253"}]},"product_tree":{"branches":[{"category":"vendor","name":"Linux","branches":[{"category":"product_name","name":"Linux","branches":[{"category":"product_version_range","name":">=d57a3a151660902091491ac2633134e1be92557f <566c4c1244de50fbff1f89ff93c9d7b0fc256db4","product":{"name":"Linux Linux >=d57a3a151660902091491ac2633134e1be92557f <566c4c1244de50fbff1f89ff93c9d7b0fc256db4","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=d57a3a151660902091491ac2633134e1be92557f <224298450be5c04d2a6ea1c2a94669d7ebf65d00","product":{"name":"Linux Linux >=d57a3a151660902091491ac2633134e1be92557f <224298450be5c04d2a6ea1c2a94669d7ebf65d00","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=d57a3a151660902091491ac2633134e1be92557f <333b6d5bb9f87827ac2639c737bf9613dbae7253","product":{"name":"Linux Linux >=d57a3a151660902091491ac2633134e1be92557f <333b6d5bb9f87827ac2639c737bf9613dbae7253","product_id":"CSAFPID-3","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Linux","branches":[{"category":"product_name","name":"Linux","branches":[{"category":"product_version","name":"6.2","product":{"name":"Linux Linux 6.2","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:6.2:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"0","product":{"name":"Linux Linux 0","product_id":"CSAFPID-5","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:6.2:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"6.18.36","product":{"name":"Linux Linux 6.18.36","product_id":"CSAFPID-6","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:6.2:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"7.0.13","product":{"name":"Linux Linux 7.0.13","product_id":"CSAFPID-7","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:6.2:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"7.1","product":{"name":"Linux Linux 7.1","product_id":"CSAFPID-8","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:6.2:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-53151","title":"rxrpc: Fix the ACK parser to extract the SACK table for parsing","notes":[{"category":"description","text":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix the ACK parser to extract the SACK table for parsing\n\nFix modification of the received skbuff in rxrpc_input_soft_acks() and a\npotential incorrect access of the buffer in a fragmented UDP packet (the\npacket would probably have to be deliberately pre-generated as fragmented)\nwhen AF_RXRPC tries to extract the contents of the SACK table by copying\nout the contents of the SACK table into a buffer before attempting to parse\n\nAF_RXRPC assumes that it can just call skb_condense() and then validly\naccess the SACK table from skb->data and that it will be a flat buffer -\nbut skb_condense() can silently fail to do anything under some\ncircumstances.\n\nNote that whilst rxrpc_input_soft_acks() should be able to parse extended\nACKs, the rest of AF_RXRPC doesn't currently support that.\n\nFurther, there's then no need to call skb_condense() in rxrpc_input_ack(),\nso don't.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4"],"fixed":["CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 0, 224298450be5c04d2a6ea1c2a94669d7ebf65d00, 333b6d5bb9f87827ac2639c737bf9613dbae7253, 566c4c1244de50fbff1f89ff93c9d7b0fc256db4, 6.18.36, 7.0.13, 7.1.","product_ids":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4"]}]}]}