{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31444", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.090Z", "datePublished": "2026-04-22T13:53:41.351Z", "dateUpdated": "2026-04-22T13:53:41.351Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-04-22T13:53:41.351Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free and NULL deref in smb_grant_oplock()\n\nsmb_grant_oplock() has two issues in the oplock publication sequence:\n\n1) opinfo is linked into ci->m_op_list (via opinfo_add) before\n add_lease_global_list() is called. If add_lease_global_list()\n fails (kmalloc returns NULL), the error path frees the opinfo\n via __free_opinfo() while it is still linked in ci->m_op_list.\n Concurrent m_op_list readers (opinfo_get_list, or direct iteration\n in smb_break_all_levII_oplock) dereference the freed node.\n\n2) opinfo->o_fp is assigned after add_lease_global_list() publishes\n the opinfo on the global lease list. A concurrent\n find_same_lease_key() can walk the lease list and dereference\n opinfo->o_fp->f_ci while o_fp is still NULL.\n\nFix by restructuring the publication sequence to eliminate post-publish\nfailure:\n\n- Set opinfo->o_fp before any list publication (fixes NULL deref).\n- Preallocate lease_table via alloc_lease_table() before opinfo_add()\n so add_lease_global_list() becomes infallible after publication.\n- Keep the original m_op_list publication order (opinfo_add before\n lease list) so concurrent opens via same_client_has_lease() and\n opinfo_get_list() still see the in-flight grant.\n- Use opinfo_put() instead of __free_opinfo() on err_out so that\n the RCU-deferred free path is used.\n\nThis also requires splitting add_lease_global_list() to take a\npreallocated lease_table and changing its return type from int to void,\nsince it can no longer fail."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/oplock.c"], "versions": [{"version": "302fef75512b2c8329a3f5efab1ae7ba2562387a", "lessThan": "9e785f004cbc56390479b77375726ea9b0d1a8a6", "status": "affected", "versionType": "git"}, {"version": "08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c", "lessThan": "7de55bba69cbf0f9280daaea385daf08bc076121", "status": "affected", "versionType": "git"}, {"version": "1d6abf145615dbfe267ce3b0a271f95e3780e18e", "lessThan": "a5c6f6d6ceefed2d5210ee420fb75f8362461f46", "status": "affected", "versionType": "git"}, {"version": "ce8507ee82c888126d8e7565e27c016308d24cde", "lessThan": "6d7e5a918c1d0aad06db0e17677b66fc9a471021", "status": "affected", "versionType": "git"}, {"version": "1dfd062caa165ec9d7ee0823087930f3ab8a6294", "lessThan": "48623ec358c1c600fa1e38368746f933e0f1a617", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/oplock.c"], "versions": [{"version": "6.6.130", "lessThan": "6.6.131", "status": "affected", "versionType": "semver"}, {"version": "6.12.78", "lessThan": "6.12.80", "status": "affected", "versionType": "semver"}, {"version": "6.18.19", "lessThan": "6.18.21", "status": "affected", "versionType": "semver"}, {"version": "6.19.9", "lessThan": "6.19.11", "status": "affected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.130", "versionEndExcluding": "6.6.131"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.78", "versionEndExcluding": "6.12.80"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.19", "versionEndExcluding": "6.18.21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.9", "versionEndExcluding": "6.19.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9e785f004cbc56390479b77375726ea9b0d1a8a6"}, {"url": "https://git.kernel.org/stable/c/7de55bba69cbf0f9280daaea385daf08bc076121"}, {"url": "https://git.kernel.org/stable/c/a5c6f6d6ceefed2d5210ee420fb75f8362461f46"}, {"url": "https://git.kernel.org/stable/c/6d7e5a918c1d0aad06db0e17677b66fc9a471021"}, {"url": "https://git.kernel.org/stable/c/48623ec358c1c600fa1e38368746f933e0f1a617"}], "title": "ksmbd: fix use-after-free and NULL deref in smb_grant_oplock()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free and NULL deref in smb_grant_oplock()\n\nsmb_grant_oplock() has two issues in the oplock publication sequence:\n\n1) opinfo is linked into ci->m_op_list (via opinfo_add) before\n add_lease_global_list() is called. If add_lease_global_list()\n fails (kmalloc returns NULL), the error path frees the opinfo\n via __free_opinfo() while it is still linked in ci->m_op_list.\n Concurrent m_op_list readers (opinfo_get_list, or direct iteration\n in smb_break_all_levII_oplock) dereference the freed node.\n\n2) opinfo->o_fp is assigned after add_lease_global_list() publishes\n the opinfo on the global lease list. A concurrent\n find_same_lease_key() can walk the lease list and dereference\n opinfo->o_fp->f_ci while o_fp is still NULL.\n\nFix by restructuring the publication sequence to eliminate post-publish\nfailure:\n\n- Set opinfo->o_fp before any list publication (fixes NULL deref).\n- Preallocate lease_table via alloc_lease_table() before opinfo_add()\n so add_lease_global_list() becomes infallible after publication.\n- Keep the original m_op_list publication order (opinfo_add before\n lease list) so concurrent opens via same_client_has_lease() and\n opinfo_get_list() still see the in-flight grant.\n- Use opinfo_put() instead of __free_opinfo() on err_out so that\n the RCU-deferred free path is used.\n\nThis also requires splitting add_lease_global_list() to take a\npreallocated lease_table and changing its return type from int to void,\nsince it can no longer fail."}], "id": "CVE-2026-31444", "lastModified": "2026-04-22T14:16:38.010", "metrics": {}, "published": "2026-04-22T14:16:38.010", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/48623ec358c1c600fa1e38368746f933e0f1a617"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6d7e5a918c1d0aad06db0e17677b66fc9a471021"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7de55bba69cbf0f9280daaea385daf08bc076121"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9e785f004cbc56390479b77375726ea9b0d1a8a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a5c6f6d6ceefed2d5210ee420fb75f8362461f46"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ksmbd: fix use-after-free and NULL deref in smb_grant_oplock()", "id": "2460707", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460707"}, "csaw": false, "cwe": "CWE-476", "details": ["A flaw was found in ksmbd, a component of the Linux kernel. This vulnerability involves a use-after-free and a NULL pointer dereference within the `smb_grant_oplock()` function during the oplock publication sequence. An attacker could potentially exploit these issues, leading to memory corruption. This could result in a denial of service (DoS) due to system instability or crashes."], "name": "CVE-2026-31444", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31444\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31444\nhttps://lore.kernel.org/linux-cve-announce/2026042245-CVE-2026-31444-8b6e@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[302fef75512b2c8329a3f5efab1ae7ba2562387a,9e785f004cbc56390479b77375726ea9b0d1a8a6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c,7de55bba69cbf0f9280daaea385daf08bc076121)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1d6abf145615dbfe267ce3b0a271f95e3780e18e,a5c6f6d6ceefed2d5210ee420fb75f8362461f46)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ce8507ee82c888126d8e7565e27c016308d24cde,6d7e5a918c1d0aad06db0e17677b66fc9a471021)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1dfd062caa165ec9d7ee0823087930f3ab8a6294,48623ec358c1c600fa1e38368746f933e0f1a617)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.130,6.6.131)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.78,6.12.80)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.19,6.18.21)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.19.9,6.19.11)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-04-22T15:45:20.720006+00:00", "updated": "2026-04-22T15:45:20.720119+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}