{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53151", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.388Z", "datePublished": "2026-06-25T08:38:36.187Z", "dateUpdated": "2026-08-05T12:33:31.692Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:33:31.692Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "lang": "en", "value": "AV:N - AF_RXRPC processes ACK packets received over UDP from a network peer. A malicious remote peer can send a crafted fragmented RxRPC ACK for an active transmitting call.\nAC:L - The needed fragmented/non-linear skb and ACK fields are attacker-controlled packet properties, and valid call state can be created by participating as the RxRPC peer. No race or condition outside the attacker's control is required.\nPR:N - The vulnerable parser is reached from network packet receive after protocol matching checks, not after any local privilege check. A remote RxRPC peer does not need an account or kernel privilege on the target.\nUI:N - Once an RxRPC service/client call exists, the malicious ACK is processed automatically by the kernel receive path. No victim user action is needed to parse the packet.\nS:U - The corruption occurs inside the target kernel's networking/RxRPC memory management context. It does not inherently cross into another security authority such as a hypervisor boundary.\nC:H - The bug performs out-of-bounds reads past the skb linear area into kernel memory while parsing attacker-supplied ACK state. As kernel memory corruption with read exposure potential, confidentiality impact is high.\nI:H - The soft-ACK loop performs read-modify-write shifts through the out-of-bounds pointer, corrupting skb tailroom, skb_shared_info, or adjacent slab memory. This is an out-of-bounds write primitive in kernel memory.\nA:H - Corrupting skb metadata or adjacent kernel objects can readily trigger an oops, panic, or memory-management failure. The crafted ACK can be sent repeatedly to sustain denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/rxrpc/input.c" ], "versions": [ { "version": "d57a3a151660902091491ac2633134e1be92557f", "lessThan": "5d1ae4e17a3ecd8561cdb4f4f70152f41039c4e1", "status": "affected", "versionType": "git" }, { "version": "d57a3a151660902091491ac2633134e1be92557f", "lessThan": "775c5e89272a2615b72bb84f611ba66fa3b7493e", "status": "affected", "versionType": "git" }, { "version": "d57a3a151660902091491ac2633134e1be92557f", "lessThan": "566c4c1244de50fbff1f89ff93c9d7b0fc256db4", "status": "affected", "versionType": "git" }, { "version": "d57a3a151660902091491ac2633134e1be92557f", "lessThan": "224298450be5c04d2a6ea1c2a94669d7ebf65d00", "status": "affected", "versionType": "git" }, { "version": "d57a3a151660902091491ac2633134e1be92557f", "lessThan": "333b6d5bb9f87827ac2639c737bf9613dbae7253", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/rxrpc/input.c" ], "versions": [ { "version": "6.2", "status": "affected" }, { "version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.144", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.95", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "6.2", "versionEndExcluding": "6.6.144" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.95" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5d1ae4e17a3ecd8561cdb4f4f70152f41039c4e1" }, { "url": "https://git.kernel.org/stable/c/775c5e89272a2615b72bb84f611ba66fa3b7493e" }, { "url": "https://git.kernel.org/stable/c/566c4c1244de50fbff1f89ff93c9d7b0fc256db4" }, { "url": "https://git.kernel.org/stable/c/224298450be5c04d2a6ea1c2a94669d7ebf65d00" }, { "url": "https://git.kernel.org/stable/c/333b6d5bb9f87827ac2639c737bf9613dbae7253" } ], "title": "rxrpc: Fix the ACK parser to extract the SACK table for parsing", "x_generator": { "engine": "bippy-1.2.0" } } } }