{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89608", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.733Z", "datePublished": "2026-09-11T19:45:10.318Z", "dateUpdated": "2026-10-19T08:49:40.341Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:49:40.341Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\necryptfs: pass packet set buffer size to parser\n\necryptfs_parse_packet_set() receives a pointer into the file header, but\nit calculates the remaining packet buffer size from PAGE_SIZE - 8. For\nversion 1 headers the packet set starts later in the header, so this can\noverstate the available buffer.\n\nPass the actual packet set buffer length from the caller and calculate\nper-packet limits from the remaining bytes in that buffer. Recompute the\nremaining length after consuming a tag 3 packet before parsing the\nfollowing tag 11 packet." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The over-read is reached only by a local open or setattr on an eCryptfs mount (ecryptfs_open/ecryptfs_setattr → ecryptfs_read_metadata → ecryptfs_parse_packet_set) which parses the attacker-supplied lower-file header or xattr; this is not a network protocol path.\nAC:L - Opening a crafted eCryptfs file deterministically feeds attacker-controlled version-1 headers and Tag 1/3/11 lengths into parse_packet_set(), which then uses an overstated PAGE_SIZE-8 bound; no race or uninfluenced memory layout is required.\nPR:L - An unprivileged user reaches this on standard eCryptfs deployments (setuid-root mount.ecryptfs_private and per-user encrypted home/Private) by planting a crafted file in their own lower directory and opening it through the already-mounted tree; init-namespace root is not required.\nUI:N - The attacker writes the malformed header into their lower directory and opens the corresponding eCryptfs file themselves; no action by another user is required.\nS:U - The out-of-bounds header-slab read and any resulting oops stay inside the host kernel eCryptfs code; this is not a VM escape, IOMMU bypass, or other cross-authority breakout.\nC:H - parse_packet_set() treats PAGE_SIZE-8 as the packet-set limit even after the version-1 header advances the pointer, and Tag 11 is parsed with the pre-Tag-3 remainder so max_packet_size can underflow; subsequent Tag 1 copies up to 512 bytes from adjacent slab/pages, an OOB read rated High unless a few bytes.\nI:N - Packet parsers memcpy into size-checked destinations (encrypted_key[], sig_tmp_space[8]); this bug is a source over-read of the PAGE_SIZE header cache object, not an out-of-bounds write, UAF, or control-flow hijack primitive.\nA:H - After the size_t remainder underflows, src[i] and later memcpy() walk off the header cache object into adjacent or unmapped pages and can oops; the attacker can reopen the crafted file to crash the host at will." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ecryptfs/crypto.c", "fs/ecryptfs/ecryptfs_kernel.h", "fs/ecryptfs/keystore.c" ], "versions": [ { "version": "237fead619984cc48818fe12ee0ceada3f55b012", "lessThan": "e7573b0e3058c6bbdfe81673f22c09900fde9e65", "status": "affected", "versionType": "git" }, { "version": "237fead619984cc48818fe12ee0ceada3f55b012", "lessThan": "66a87559ecb26afe80ad512faf728a158e2b81da", "status": "affected", "versionType": "git" }, { "version": "237fead619984cc48818fe12ee0ceada3f55b012", "lessThan": "3bd9bb3e167a7c14a50423f6ff03ee0fb007199d", "status": "affected", "versionType": "git" }, { "version": "237fead619984cc48818fe12ee0ceada3f55b012", "lessThan": "749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaac", "status": "affected", "versionType": "git" }, { "version": "237fead619984cc48818fe12ee0ceada3f55b012", "lessThan": "329de8b9e988b152b938f09224670d97bada0b96", "status": "affected", "versionType": "git" }, { "version": "237fead619984cc48818fe12ee0ceada3f55b012", "lessThan": "e5d254e654f2311a3c4b9c791d7f216554bcd17a", "status": "affected", "versionType": "git" }, { "version": "237fead619984cc48818fe12ee0ceada3f55b012", "lessThan": "747fd45be396a6aea3420ab657a0ab4e60185b05", "status": "affected", "versionType": "git" }, { "version": "237fead619984cc48818fe12ee0ceada3f55b012", "lessThan": "2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ecryptfs/crypto.c", "fs/ecryptfs/ecryptfs_kernel.h", "fs/ecryptfs/keystore.c" ], "versions": [ { "version": "2.6.19", "status": "affected" }, { "version": "0", "lessThan": "2.6.19", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "2.6.19", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e7573b0e3058c6bbdfe81673f22c09900fde9e65" }, { "url": "https://git.kernel.org/stable/c/66a87559ecb26afe80ad512faf728a158e2b81da" }, { "url": "https://git.kernel.org/stable/c/3bd9bb3e167a7c14a50423f6ff03ee0fb007199d" }, { "url": "https://git.kernel.org/stable/c/749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaac" }, { "url": "https://git.kernel.org/stable/c/329de8b9e988b152b938f09224670d97bada0b96" }, { "url": "https://git.kernel.org/stable/c/e5d254e654f2311a3c4b9c791d7f216554bcd17a" }, { "url": "https://git.kernel.org/stable/c/747fd45be396a6aea3420ab657a0ab4e60185b05" }, { "url": "https://git.kernel.org/stable/c/2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2" } ], "title": "ecryptfs: pass packet set buffer size to parser", "x_generator": { "engine": "bippy-1.2.0" } } } }