{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-35882", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.112Z", "datePublished": "2024-05-19T08:34:39.185Z", "dateUpdated": "2026-08-05T11:30:39.154Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:30:39.154Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: Fix a slow server-side memory leak with RPC-over-TCP\n\nJan Schunk reports that his small NFS servers suffer from memory\nexhaustion after just a few days. A bisect shows that commit\ne18e157bb5c8 (\"SUNRPC: Send RPC message on TCP with a single\nsock_sendmsg() call\") is the first bad commit.\n\nThat commit assumed that sock_sendmsg() releases all the pages in\nthe underlying bio_vec array, but the reality is that it doesn't.\nsvc_xprt_release() releases the rqst's response pages, but the\nrecord marker page fragment isn't one of those, so it is never\nreleased.\n\nThis is a narrow fix that can be applied to stable kernels. A\nmore extensive fix is in the works." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The leak is in the server-side SUNRPC transmit path used by nfsd/lockd over TCP; it is triggered by sending an RPC to the listening socket from any remote host that can reach the service.\nAC:L - No race, timing, or memory-layout condition is involved — every RPC reply leaks the record-marker fragment deterministically, and every new TCP connection leaks a full 32 KB page.\nPR:N - svc_process_common() emits a reply (and thus allocates the leaked marker) via its err_bad_prog/err_bad_vers/err_bad_proc/err_bad_auth paths and for the NULL procedure, so no valid credentials or export membership are needed.\nUI:N - The attacker drives the entire sequence by connecting and sending RPC traffic; no action by a local user or administrator is required.\nS:U - The leaked memory and the resulting exhaustion are confined to the kernel of the NFS server itself, with no crossing of a virtualization, IOMMU, or sandbox boundary.\nC:N - The bug only fails to release a reference on a page fragment; no kernel memory contents are disclosed to the attacker and there is no out-of-bounds read.\nI:N - No memory is corrupted or overwritten — the fragment is simply never freed, so no data or control-flow integrity is affected.\nA:H - __page_frag_cache_drain() cannot free the 32 KB order-3 page because the never-released marker fragment holds the last reference, so each unauthenticated connection permanently leaks up to 32 KB; a remote attacker looping connect/send/close exhausts server memory and triggers OOM, and real deployments died of memory exhaustion under normal load." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sunrpc/svcsock.c" ], "versions": [ { "version": "e18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4", "lessThan": "1ba1291172f935e6b6fe703161a948f3347400b8", "status": "affected", "versionType": "git" }, { "version": "e18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4", "lessThan": "a2ebedf7bcd17a1194a0a18122c885eb578ee882", "status": "affected", "versionType": "git" }, { "version": "e18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4", "lessThan": "05258a0a69b3c5d2c003f818702c0a52b6fea861", "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/sunrpc/svcsock.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.26", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.5", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "6.6", "versionEndExcluding": "6.6.26" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.8.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1ba1291172f935e6b6fe703161a948f3347400b8" }, { "url": "https://git.kernel.org/stable/c/a2ebedf7bcd17a1194a0a18122c885eb578ee882" }, { "url": "https://git.kernel.org/stable/c/05258a0a69b3c5d2c003f818702c0a52b6fea861" } ], "title": "SUNRPC: Fix a slow server-side memory leak with RPC-over-TCP", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-35882", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-05-20T17:12:02.633258Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:34:45.656Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:21:48.421Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/1ba1291172f935e6b6fe703161a948f3347400b8", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/a2ebedf7bcd17a1194a0a18122c885eb578ee882", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/05258a0a69b3c5d2c003f818702c0a52b6fea861", "tags": [ "x_transferred" ] } ] } ] } }