{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-89544", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-89544", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-11T19:44:20.424Z", "updatedAt": "2026-10-21T12:47:49.203Z", "importedAt": "2026-10-24T01:58:35.090Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "SUNRPC: fix gssx_dec_option_array error path bugs", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: fix gssx_dec_option_array error path bugs\n\nFour coupled defects in the gssx XDR option-array decoder make the\nerror paths unsafe: a NULL deref in the caller, a refcount leak on\nthe decoded group_info, and a latent use-after-free that the leak\nfix would otherwise expose.\n\ngssx_dec_option_array() sets oa->count = 1 before allocating\noa->data. If that allocation fails, -ENOMEM is returned with\noa->count == 1 and oa->data == NULL. All other error paths jump\nto free_oa: which frees oa->data and NULLs it but also leaves\noa->count == 1. The caller trusts the count:\n\n gssp_accept_sec_context_upcall()\n gssx_dec_accept_sec_context()\n gssx_dec_option_array() /* fails, count=1 data=NULL */\n data = res.options.data[0].value /* NULL deref */\n\nIndependently, free_creds: releases the partially decoded svc_cred\nwith a bare kfree(creds). gssx_dec_linux_creds() installs a\ngroups_alloc() result into creds->cr_group_info; that object is\nkvmalloc-backed and refcounted, and only put_group_info() reaches\nkvfree(). A plain kfree(creds) drops the wrapper and leaks the\ngroup_info allocation.\n\nThe natural fix for the leak is to call free_svc_cred(creds) before\nkfree(creds), but free_svc_cred() invokes put_group_info() on\ncreds->cr_group_info unconditionally when non-NULL. The existing\nout_free_groups: path in gssx_dec_linux_creds() already called\ngroups_free() on that pointer without clearing it, so once\nfree_svc_cred() is wired in, the subsequent put_group_info() would\ntouch freed memory.\n\nFix all four together:\n\n - Move the oa->count = 1 assignment below the oa->data allocation\n so it is never set when oa->data is NULL.\n - Reset oa->count to 0 at free_oa: so count and data stay\n coherent and the caller sees an empty option array.\n - Call free_svc_cred(creds) before kfree(creds) at free_creds:\n so the refcounted cr_group_info is released. free_svc_cred()\n either NULL-guards each field explicitly (cr_group_info has\n an if() check) or delegates to a helper that is NULL-safe\n itself (kfree for the string fields, gss_mech_put() which\n guards with if(gm) at gss_mech_switch.c:342), so it is safe\n to call on a partially decoded svc_cred where only\n cr_uid/cr_gid/cr_group_info have been written and everything\n else is zero from kzalloc.\n - In gssx_dec_linux_creds()'s out_free_groups: path, release\n cr_group_info with put_group_info() rather than groups_free()\n so the teardown matches free_svc_cred()'s refcount-aware path,\n and clear the pointer so a later free_svc_cred() on the same\n creds does not release it a second time.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "5e6013ae2c8d420faea553d363935f65badd32c3", "status": "affected", "versionType": "git", "lessThan": "8c56a46db3b7523f13e167c3e2c6e3c47a87dcb3" }, { "version": "3cfcfc102a5e57b021b786a755a38935e357797d", "status": "affected", "versionType": "git", "lessThan": "fb30241f7ccace372ee83017891549f23a715581" }, { "version": "3cfcfc102a5e57b021b786a755a38935e357797d", "status": "affected", "versionType": "git", "lessThan": "3ff45361e9469e85c0f86b8e7b82c63e50bab8ef" }, { "version": "3cfcfc102a5e57b021b786a755a38935e357797d", "status": "affected", "versionType": "git", "lessThan": "f85a83774d7f4e2ac71c0c384df0dfb6f7d0179a" }, { "version": "3cfcfc102a5e57b021b786a755a38935e357797d", "status": "affected", "versionType": "git", "lessThan": "5e9a94539b1ec17a89177d952badfd0d844d694a" }, { "version": "b97c37978ca825557d331c9012e0c1ddc0e42364", "status": "affected", "versionType": "git" }, { "version": "bfa9d86d39a0fe4685f90c3529aa9bd62a9d97a8", "status": "affected", "versionType": "git" }, { "version": "bb336cd8d5ecb69c430ebe3e7bcff68471d93fa8", "status": "affected", "versionType": "git" }, { "version": "dd292e884c649f9b1c18af0ec75ca90b390cd044", "status": "affected", "versionType": "git" }, { "version": "934212a623cbab851848b6de377eb476718c3e4c", "status": "affected", "versionType": "git" }, { "version": "9806c2393cd2ab0a8e7bb9ffae02ce20e3112ec4", "status": "affected", "versionType": "git" }, { "version": "996997d1fb2126feda550d6adcedcbd94911fc69", "status": "affected", "versionType": "git" }, { "version": "6.6.23", "status": "affected", "versionType": "semver", "lessThan": "6.6.160" }, { "version": "4.19.311", "status": "affected", "versionType": "semver", "lessThan": "4.20" }, { "version": "5.4.273", "status": "affected", "versionType": "semver", "lessThan": "5.5" }, { "version": "5.10.214", "status": "affected", "versionType": "semver", "lessThan": "5.11" }, { "version": "5.15.153", "status": "affected", "versionType": "semver", "lessThan": "5.16" }, { "version": "6.1.83", "status": "affected", "versionType": "semver", "lessThan": "6.2" }, { "version": "6.7.11", "status": "affected", "versionType": "semver", "lessThan": "6.8" }, { "version": "6.8.2", "status": "affected", "versionType": "semver", "lessThan": "6.9" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.9", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.9" }, { "version": "6.6.160", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.111", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.51", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.4", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }