{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64418", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.786Z", "datePublished": "2026-07-25T08:50:57.594Z", "dateUpdated": "2026-07-25T08:50:57.594Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-25T08:50:57.594Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: shrinker: fix shrinker_info teardown race with expansion\n\nexpand_shrinker_info() iterates all visible memcgs under shrinker_mutex,\nincluding memcgs that have not finished ->css_online() yet.\n\nOnce pn->shrinker_info has been published, teardown must stay serialized\nwith expand_shrinker_info() until that memcg is either fully online or no\nlonger visible to iteration. Today alloc_shrinker_info() breaks that rule\nby dropping shrinker_mutex before freeing a partially initialized\nshrinker_info array, which may cause the following race:\n\nCPU0 CPU1\n==== ====\n\ncss_create\n--> list_add_tail_rcu(&css->sibling, &parent_css->children);\n online_css\n --> mem_cgroup_css_online\n --> alloc_shrinker_info\n --> alloc node0 info\n rcu_assign_pointer(C->node0->shrinker_info, old0)\n alloc node1 info -> FAIL -> goto err\n mutex_unlock(shrinker_mutex)\n\n shrinker_alloc()\n --> shrinker_memcg_alloc\n --> mutex_lock(shrinker_mutex)\n expand_shrinker_info\n --> mem_cgroup_iter see the memcg\n expand_one_shrinker_info\n --> old0 = C->node0->shrinker_info\n memcpy(new->unit, old0->unit, ...);\n\n free_shrinker_info\n --> kvfree(old0);\n\n /* double free !! */\n kvfree_rcu(old0, rcu);\n\nThe same problem exists later in mem_cgroup_css_online(). If\nalloc_shrinker_info() succeeds but a subsequent objcg allocation fails,\nthe free_objcg -> free_shrinker_info() unwind path tears down the already\npublished pn->shrinker_info arrays without shrinker_mutex. The\nexpand_one_shrinker_info() can race with that teardown in the same way,\nleading to use-after-free or double-free of the old shrinker_info.\n\nFix this by serializing shrinker_info teardown with shrinker_mutex, and by\nkeeping alloc_shrinker_info() error cleanup inside the locked section."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/shrinker.c"], "versions": [{"version": "307bececcd1205bcb67a3c0d53a69db237ccc9d4", "lessThan": "b9a280a9a454ed514636351d53fe2a233dc5054b", "status": "affected", "versionType": "git"}, {"version": "307bececcd1205bcb67a3c0d53a69db237ccc9d4", "lessThan": "6465ff3ce65131c774a312d450abe10f4b9f3875", "status": "affected", "versionType": "git"}, {"version": "307bececcd1205bcb67a3c0d53a69db237ccc9d4", "lessThan": "284c267f013e45d8c89d9fb9373105dc8e6c0947", "status": "affected", "versionType": "git"}, {"version": "307bececcd1205bcb67a3c0d53a69db237ccc9d4", "lessThan": "65476d31d8056e859c48580f82295ce159196ffe", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/shrinker.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc3", "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": "6.7", "versionEndExcluding": "6.12.96"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.18.39"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.2-rc3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b9a280a9a454ed514636351d53fe2a233dc5054b"}, {"url": "https://git.kernel.org/stable/c/6465ff3ce65131c774a312d450abe10f4b9f3875"}, {"url": "https://git.kernel.org/stable/c/284c267f013e45d8c89d9fb9373105dc8e6c0947"}, {"url": "https://git.kernel.org/stable/c/65476d31d8056e859c48580f82295ce159196ffe"}], "title": "mm: shrinker: fix shrinker_info teardown race with expansion", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[307bececcd1205bcb67a3c0d53a69db237ccc9d4,b9a280a9a454ed514636351d53fe2a233dc5054b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[307bececcd1205bcb67a3c0d53a69db237ccc9d4,6465ff3ce65131c774a312d450abe10f4b9f3875)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[307bececcd1205bcb67a3c0d53a69db237ccc9d4,284c267f013e45d8c89d9fb9373105dc8e6c0947)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[307bececcd1205bcb67a3c0d53a69db237ccc9d4,65476d31d8056e859c48580f82295ce159196ffe)"}}], "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": "generic", "value": "6.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.96,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.39,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.4,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc3,*]"}}], "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": "2026-07-25T18:30:17.014973+00:00", "updated": "2026-07-25T18:30:17.015006+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}