{"api_version":"1","generated_at":"2026-05-28T00:40:46+00:00","cve":"CVE-2026-45884","urls":{"html":"https://cve.report/CVE-2026-45884","api":"https://cve.report/api/cve/CVE-2026-45884.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-45884","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45884"},"summary":{"title":"apparmor: avoid per-cpu hold underflow in aa_get_buffer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: avoid per-cpu hold underflow in aa_get_buffer\n\nWhen aa_get_buffer() pulls from the per-cpu list it unconditionally\ndecrements cache->hold. If hold reaches 0 while count is still non-zero,\nthe unsigned decrement wraps to UINT_MAX. This keeps hold non-zero for a\nvery long time, so aa_put_buffer() never returns buffers to the global\nlist, which can starve other CPUs and force repeated kmalloc(aa_g_path_max)\nallocations.\n\nGuard the decrement so hold never underflows.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-27 14:17:02","updated_at":"2026-05-27 14:48:31"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/640cf2f09575c9dc344b3f7be2498d31e3923ead","name":"https://git.kernel.org/stable/c/640cf2f09575c9dc344b3f7be2498d31e3923ead","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/80c334acc6d0bee8605a358a33e69b4aea1ffb92","name":"https://git.kernel.org/stable/c/80c334acc6d0bee8605a358a33e69b4aea1ffb92","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/202824a1f89a9786c20a3d646a7c88d223abb1b2","name":"https://git.kernel.org/stable/c/202824a1f89a9786c20a3d646a7c88d223abb1b2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169","name":"https://git.kernel.org/stable/c/4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-45884","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45884","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ea9bae12d02819556db63348db8bd8441eb316f2 202824a1f89a9786c20a3d646a7c88d223abb1b2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ea9bae12d02819556db63348db8bd8441eb316f2 80c334acc6d0bee8605a358a33e69b4aea1ffb92 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ea9bae12d02819556db63348db8bd8441eb316f2 4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ea9bae12d02819556db63348db8bd8441eb316f2 640cf2f09575c9dc344b3f7be2498d31e3923ead git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.7","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.75 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.14 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.4 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["security/apparmor/lsm.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"202824a1f89a9786c20a3d646a7c88d223abb1b2","status":"affected","version":"ea9bae12d02819556db63348db8bd8441eb316f2","versionType":"git"},{"lessThan":"80c334acc6d0bee8605a358a33e69b4aea1ffb92","status":"affected","version":"ea9bae12d02819556db63348db8bd8441eb316f2","versionType":"git"},{"lessThan":"4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169","status":"affected","version":"ea9bae12d02819556db63348db8bd8441eb316f2","versionType":"git"},{"lessThan":"640cf2f09575c9dc344b3f7be2498d31e3923ead","status":"affected","version":"ea9bae12d02819556db63348db8bd8441eb316f2","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["security/apparmor/lsm.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.7"},{"lessThan":"6.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.75","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.14","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.75","versionStartIncluding":"6.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.14","versionStartIncluding":"6.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.4","versionStartIncluding":"6.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"6.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: avoid per-cpu hold underflow in aa_get_buffer\n\nWhen aa_get_buffer() pulls from the per-cpu list it unconditionally\ndecrements cache->hold. If hold reaches 0 while count is still non-zero,\nthe unsigned decrement wraps to UINT_MAX. This keeps hold non-zero for a\nvery long time, so aa_put_buffer() never returns buffers to the global\nlist, which can starve other CPUs and force repeated kmalloc(aa_g_path_max)\nallocations.\n\nGuard the decrement so hold never underflows."}],"providerMetadata":{"dateUpdated":"2026-05-27T12:16:56.542Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/202824a1f89a9786c20a3d646a7c88d223abb1b2"},{"url":"https://git.kernel.org/stable/c/80c334acc6d0bee8605a358a33e69b4aea1ffb92"},{"url":"https://git.kernel.org/stable/c/4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169"},{"url":"https://git.kernel.org/stable/c/640cf2f09575c9dc344b3f7be2498d31e3923ead"}],"title":"apparmor: avoid per-cpu hold underflow in aa_get_buffer","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-45884","datePublished":"2026-05-27T12:16:56.542Z","dateReserved":"2026-05-13T15:03:33.082Z","dateUpdated":"2026-05-27T12:16:56.542Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-27 14:17:02","lastModifiedDate":"2026-05-27 14:48:31","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"45884","Ordinal":"1","Title":"apparmor: avoid per-cpu hold underflow in aa_get_buffer","CVE":"CVE-2026-45884","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"45884","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: avoid per-cpu hold underflow in aa_get_buffer\n\nWhen aa_get_buffer() pulls from the per-cpu list it unconditionally\ndecrements cache->hold. If hold reaches 0 while count is still non-zero,\nthe unsigned decrement wraps to UINT_MAX. This keeps hold non-zero for a\nvery long time, so aa_put_buffer() never returns buffers to the global\nlist, which can starve other CPUs and force repeated kmalloc(aa_g_path_max)\nallocations.\n\nGuard the decrement so hold never underflows.","Type":"Description","Title":"apparmor: avoid per-cpu hold underflow in aa_get_buffer"}]}}}