{"id":"CVE-2026-89608","title":"ecryptfs: pass packet set buffer size to parser","summary":"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…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","cvssSource":"cna","cwe":["CWE-131"],"vendor":"Linux","product":"Linux","affected":["Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < e7573b0e3058c6bbdfe81673f22c09900fde9e65","Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < 66a87559ecb26afe80ad512faf728a158e2b81da","Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < 3bd9bb3e167a7c14a50423f6ff03ee0fb007199d","Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < 749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaac","Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < 329de8b9e988b152b938f09224670d97bada0b96","Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < e5d254e654f2311a3c4b9c791d7f216554bcd17a","Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < 747fd45be396a6aea3420ab657a0ab4e60185b05","Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < 2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2","Linux 2.6.19"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:49:40.341Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89608","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"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89608.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89608"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532240"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89608"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89608"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89608.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00164,"epssPercentile":0.0557,"scores":{"cna":7.1,"vendor":5.5},"ingestedAt":"2026-09-14T15:23:07.450Z","slug":"CVE-2026-89608","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < e7573b0e3058c6bbdfe81673f22c09900fde9e65`\n- `Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < 66a87559ecb26afe80ad512faf728a158e2b81da`\n- `Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < 3bd9bb3e167a7c14a50423f6ff03ee0fb007199d`\n- `Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < 749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaac`\n- `Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < 329de8b9e988b152b938f09224670d97bada0b96`\n- `Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < e5d254e654f2311a3c4b9c791d7f216554bcd17a`\n- `Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < 747fd45be396a6aea3420ab657a0ab4e60185b05`\n- `Linux >= 237fead619984cc48818fe12ee0ceada3f55b012 < 2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2`\n- `Linux 2.6.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89608.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224671,"id":"CVE-2026-89608","ts":1792401467780,"field":"cvss","old":"5.5","new":"7.1"},{"seq":224670,"id":"CVE-2026-89608","ts":1792401467780,"field":"severity","old":"medium","new":"high"},{"seq":208127,"id":"CVE-2026-89608","ts":1789922722016,"field":"cvss","old":"7.1","new":"5.5"},{"seq":208126,"id":"CVE-2026-89608","ts":1789922722016,"field":"severity","old":"high","new":"medium"},{"seq":197859,"id":"CVE-2026-89608","ts":1789384320704,"field":"cvss","old":"5.3","new":"7.1"},{"seq":197858,"id":"CVE-2026-89608","ts":1789384320704,"field":"severity","old":"medium","new":"high"},{"seq":183420,"id":"CVE-2026-89608","ts":1789356675293,"field":"cvss","old":"7.1","new":"5.3"},{"seq":183419,"id":"CVE-2026-89608","ts":1789356675293,"field":"severity","old":"high","new":"medium"},{"seq":153434,"id":"CVE-2026-89608","ts":1789285350497,"field":"cvss","old":null,"new":"7.1"},{"seq":153433,"id":"CVE-2026-89608","ts":1789285350497,"field":"severity","old":"none","new":"high"},{"seq":147512,"id":"CVE-2026-89608","ts":1789270211198,"field":"cvss","old":null,"new":"5.3"},{"seq":147511,"id":"CVE-2026-89608","ts":1789270211198,"field":"severity","old":"none","new":"medium"},{"seq":109258,"id":"CVE-2026-89608","ts":1789183731174,"field":"cvss","old":null,"new":"5.3"},{"seq":109257,"id":"CVE-2026-89608","ts":1789183731174,"field":"severity","old":"none","new":"medium"}]}