{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72455", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.932Z", "datePublished": "2026-08-15T05:57:02.234Z", "dateUpdated": "2026-08-17T05:44:24.111Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:44:24.111Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix uninitialised pointer passed to audit_log_untrustedstring()\n\nCommit 4a134723f9f1 (\"apparmor: move check for aa_null file to cover all cases\")\nintrdouced a small bug, where path_name() may pass a potentially uninitialized\n*name to aa_audit_file() if the path->dentry had been replaced with\naa_null.dentry earlier on. This can lead to page fault like one observed on\n7.0.2 openSUSE Tumbleweed kernel:\n\n[51692.242756] [ T24690] BUG: unable to handle page fault for address: 0000000f00000003\n[51692.242762] [ T24690] #PF: supervisor read access in kernel mode\n[51692.242763] [ T24690] #PF: error_code(0x0000) - not-present page\n[51692.242765] [ T24690] PGD 0 P4D 0\n[51692.242768] [ T24690] Oops: Oops: 0000 [#1] SMP NOPTI\n[51692.242772] [ T24690] CPU: 3 UID: 1020 PID: 24690 Comm: snap-confine Tainted: G O 7.0.2-1-default #1 PREEMPT(full) openSUSE Tumbleweed ab90b4c9940707f9cafa19bdad80b2cec52dbe51\n[51692.242775] [ T24690] Tainted: [O]=OOT_MODULE\n[51692.242777] [ T24690] Hardware name: Framework Laptop 13 (AMD Ryzen 7040Series)/FRANMDCP05, BIOS 03.18 01/08/2026\n[51692.242778] [ T24690] RIP: 0010:strlen+0x4/0x30\n[51692.242783] [ T24690] Code: f7 75 ec 31 c0 e9 17 9f 00 ff 48 89 f8 e9 0f 9f 00 ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <80> 3f 00 74 18 48 89 f8 0f 1f 40 00 48 83 c0 01 80 38 00 75 f7 48\n[51692.242785] [ T24690] RSP: 0018:ffffd015eb1e3608 EFLAGS: 00010282\n[51692.242787] [ T24690] RAX: 0000000000000000 RBX: ffff89796198a360 RCX: 0000000000000000\n[51692.242788] [ T24690] RDX: 00000000000000d1 RSI: 0000000f00000003 RDI: 0000000f00000003\n[51692.242790] [ T24690] RBP: ffffffffb7ede090 R08: 00000000000005f5 R09: 0000000000000000\n[51692.242791] [ T24690] R10: 0000000000000000 R11: 0000000000000000 R12: ffffd015eb1e3700\n[51692.242792] [ T24690] R13: ffff8977a22bc380 R14: ffffffffb7ec5190 R15: ffff8977a0c8aa80\n[51692.242794] [ T24690] FS: 0000000000000000(0000) GS:ffff897f640d8000(0000) knlGS:0000000000000000\n[51692.242796] [ T24690] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[51692.242797] [ T24690] CR2: 0000000f00000003 CR3: 00000006ad15f000 CR4: 0000000000f50ef0\n[51692.242799] [ T24690] PKRU: 55555554\n[51692.242800] [ T24690] Call Trace:\n[51692.242802] [ T24690] \n[51692.242804] [ T24690] audit_log_untrustedstring+0x1d/0x40\n[51692.242811] [ T24690] common_lsm_audit+0x71/0x1d0\n[51692.242816] [ T24690] aa_audit+0x5a/0x170\n[51692.242819] [ T24690] aa_audit_file+0x18a/0x1b0\n[51692.242825] [ T24690] path_name+0xd2/0x100\n[51692.242829] [ T24690] profile_path_perm.part.0+0x58/0xb0\n[51692.242832] [ T24690] aa_path_perm+0xef/0x150\n[51692.242837] [ T24690] apparmor_file_open+0x153/0x2e0\n[51692.242840] [ T24690] security_file_open+0x46/0xd0\n[51692.242844] [ T24690] do_dentry_open+0xe9/0x4d0\n[51692.242848] [ T24690] vfs_open+0x30/0x100\n\nWhile here, initialise variables which are passed down to path_name()." } ], "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 - Exploitation requires local syscalls that invoke AppArmor LSM file/path hooks (e.g. open on an inherited fd replaced with aa_null.dentry during exec); there is no network, adjacent-wireless, or physical-device entry point to this audit code path.\nAC:L - An unprivileged attacker can reliably trigger the bug by execing into a confined AppArmor profile with disallowed inherited fds (aa_inherit_files replaces them with aa_null) and then opening or linking those paths; this was reproduced in production by snap-confine without rare timing or layout dependencies.\nPR:L - The observed crash was from snap-confine running as UID 1020 under AppArmor confinement; triggering the aa_null inheritance-and-reopen sequence requires only a normal unprivileged local account on an AppArmor-enabled system, not real init-namespace root or special capabilities.\nUI:N - No victim interaction is required beyond the attacker performing their own exec and subsequent file operations to hit the vulnerable audit path on aa_null-replaced file descriptors.\nS:U - Impact is a kernel oops/panic from the LSM audit path within the same kernel security domain; it is not a cross-boundary escape such as KVM guest-to-host or IOMMU bypass.\nC:H - The uninitialized name pointer is passed to audit_log_untrustedstring(), which calls strlen() and performs an uncontrolled kernel memory read; if the stack value were valid, leaked bytes could be written to the audit log, and even the faulting read is an out-of-bounds-style disclosure primitive.\nI:N - The flaw is an uninitialized-pointer read in strlen during audit formatting; it does not corrupt or modify kernel or user data, and observed impact is a crash rather than an arbitrary write or code-execution primitive.\nA:H - Triggering the uninitialized pointer in audit_log_untrustedstring() causes a supervisor page fault and kernel oops, as demonstrated on openSUSE Tumbleweed 7.0.2, denying service to the local system and potentially all users on the host." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "security/apparmor/file.c" ], "versions": [ { "version": "b2a8011ae8749215f3939881239b454728a2d88b", "lessThan": "2791dd42d41e38805572b12116f721c97c4fcc0c", "status": "affected", "versionType": "git" }, { "version": "4a134723f9f1ad2f3621566259db673350d19cb1", "lessThan": "a5c79d44ef19203bd7cf6f3de8ff088112ebff95", "status": "affected", "versionType": "git" }, { "version": "4a134723f9f1ad2f3621566259db673350d19cb1", "lessThan": "bcd1b34c21748531a3febaf7440632b89d8deab7", "status": "affected", "versionType": "git" }, { "version": "d276f52ecaf854e41549311e93802afea0abab5b", "status": "affected", "versionType": "git" }, { "version": "6.18.14", "lessThan": "6.18.40", "status": "affected", "versionType": "semver" }, { "version": "6.19.4", "lessThan": "6.20", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "security/apparmor/file.c" ], "versions": [ { "version": "7.0", "status": "affected" }, { "version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "6.18.14", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.4" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2791dd42d41e38805572b12116f721c97c4fcc0c" }, { "url": "https://git.kernel.org/stable/c/a5c79d44ef19203bd7cf6f3de8ff088112ebff95" }, { "url": "https://git.kernel.org/stable/c/bcd1b34c21748531a3febaf7440632b89d8deab7" } ], "title": "apparmor: fix uninitialised pointer passed to audit_log_untrustedstring()", "x_generator": { "engine": "bippy-1.2.0" } } } }