268 lines
14 KiB
JSON
268 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-89608",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.733Z",
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"datePublished": "2026-09-11T19:45:10.318Z",
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"dateUpdated": "2026-10-19T08:49:40.341Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:49:40.341Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ecryptfs/crypto.c",
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"fs/ecryptfs/ecryptfs_kernel.h",
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"fs/ecryptfs/keystore.c"
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],
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"versions": [
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{
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"version": "237fead619984cc48818fe12ee0ceada3f55b012",
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"lessThan": "e7573b0e3058c6bbdfe81673f22c09900fde9e65",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "237fead619984cc48818fe12ee0ceada3f55b012",
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"lessThan": "66a87559ecb26afe80ad512faf728a158e2b81da",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "237fead619984cc48818fe12ee0ceada3f55b012",
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"lessThan": "3bd9bb3e167a7c14a50423f6ff03ee0fb007199d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "237fead619984cc48818fe12ee0ceada3f55b012",
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"lessThan": "749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaac",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "237fead619984cc48818fe12ee0ceada3f55b012",
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"lessThan": "329de8b9e988b152b938f09224670d97bada0b96",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "237fead619984cc48818fe12ee0ceada3f55b012",
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"lessThan": "e5d254e654f2311a3c4b9c791d7f216554bcd17a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "237fead619984cc48818fe12ee0ceada3f55b012",
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"lessThan": "747fd45be396a6aea3420ab657a0ab4e60185b05",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "237fead619984cc48818fe12ee0ceada3f55b012",
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"lessThan": "2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ecryptfs/crypto.c",
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"fs/ecryptfs/ecryptfs_kernel.h",
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"fs/ecryptfs/keystore.c"
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],
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"versions": [
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{
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"version": "2.6.19",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "2.6.19",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.270",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.221",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.188",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.157",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.109",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.50",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.19",
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"versionEndExcluding": "5.10.270"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.19",
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"versionEndExcluding": "5.15.221"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.19",
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"versionEndExcluding": "6.1.188"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.19",
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"versionEndExcluding": "6.6.157"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.19",
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"versionEndExcluding": "6.12.109"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.19",
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"versionEndExcluding": "6.18.50"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.19",
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"versionEndExcluding": "7.2.4"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.19",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/e7573b0e3058c6bbdfe81673f22c09900fde9e65"
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},
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{
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"url": "https://git.kernel.org/stable/c/66a87559ecb26afe80ad512faf728a158e2b81da"
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},
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{
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"url": "https://git.kernel.org/stable/c/3bd9bb3e167a7c14a50423f6ff03ee0fb007199d"
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},
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{
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"url": "https://git.kernel.org/stable/c/749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaac"
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},
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{
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"url": "https://git.kernel.org/stable/c/329de8b9e988b152b938f09224670d97bada0b96"
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},
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{
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"url": "https://git.kernel.org/stable/c/e5d254e654f2311a3c4b9c791d7f216554bcd17a"
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},
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{
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"url": "https://git.kernel.org/stable/c/747fd45be396a6aea3420ab657a0ab4e60185b05"
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},
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{
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"url": "https://git.kernel.org/stable/c/2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2"
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}
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],
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"title": "ecryptfs: pass packet set buffer size to parser",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |