206 lines
10 KiB
JSON
206 lines
10 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64419",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T15:36:31.786Z",
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"datePublished": "2026-07-25T08:50:58.342Z",
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"dateUpdated": "2026-08-17T04:55:18.870Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-17T04:55:18.870Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/shrinker: do not hold RCU lock in shrinker_debugfs_count_show()\n\nReading the debugfs \"count\" file of a memcg-aware shrinker can sleep\ninside an RCU read-side critical section:\n\n BUG: sleeping function called from invalid context at kernel/cgroup/rstat.c:421\n RCU nest depth: 1, expected: 0\n css_rstat_flush\n mem_cgroup_flush_stats\n zswap_shrinker_count\n shrinker_debugfs_count_show\n\nshrinker_debugfs_count_show() invokes the ->count_objects() callback under\nrcu_read_lock(). The zswap callback flushes memcg stats via\ncss_rstat_flush(), which may sleep, so it must not run under RCU.\n\nThe RCU lock is not needed here. mem_cgroup_iter() takes RCU internally\nand returns a memcg holding a css reference (dropped on the next iteration\nor by mem_cgroup_iter_break()), so the memcg stays alive without it. The\nshrinker is kept alive by the open debugfs file: shrinker_free() removes\nthe debugfs entries via debugfs_remove_recursive(), which waits for\nin-flight readers to drain, before call_rcu(..., shrinker_free_rcu_cb). \nThe sibling \"scan\" handler already invokes the sleeping ->scan_objects()\ncallback with no RCU section.\n\nDrop the rcu_read_lock()/rcu_read_unlock()."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"mm/shrinker_debug.c"
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],
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"versions": [
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{
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"version": "5035ebc644aec92d55d1bbfe042f35341e4bffb5",
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"lessThan": "de5f69b8dae8698ac5e48dfcd30017887cdf4e5a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5035ebc644aec92d55d1bbfe042f35341e4bffb5",
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"lessThan": "e441cbfbd0eaa6404278e985033c33caba4db767",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5035ebc644aec92d55d1bbfe042f35341e4bffb5",
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"lessThan": "2fed79f0fe8c8d28a972c290dbfd693c3546c8c4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5035ebc644aec92d55d1bbfe042f35341e4bffb5",
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"lessThan": "560e21e8ccff813e84d05f6500907c549a3d6985",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5035ebc644aec92d55d1bbfe042f35341e4bffb5",
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"lessThan": "86237e56091e70f09c0fbf217f9d9c0e08f556c4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5035ebc644aec92d55d1bbfe042f35341e4bffb5",
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"lessThan": "b902890c62d200b3509cb5e09cf1e0a66553c128",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"mm/shrinker_debug.c"
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],
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"versions": [
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{
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"version": "6.0",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.0",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.178",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.145",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.96",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.39",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.4",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "6.1.178"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "6.6.145"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "6.12.96"
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "6.18.39"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "7.1.4"
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"versionEndExcluding": "7.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/de5f69b8dae8698ac5e48dfcd30017887cdf4e5a"
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},
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{
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"url": "https://git.kernel.org/stable/c/e441cbfbd0eaa6404278e985033c33caba4db767"
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},
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{
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"url": "https://git.kernel.org/stable/c/2fed79f0fe8c8d28a972c290dbfd693c3546c8c4"
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},
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{
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"url": "https://git.kernel.org/stable/c/560e21e8ccff813e84d05f6500907c549a3d6985"
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},
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{
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"url": "https://git.kernel.org/stable/c/86237e56091e70f09c0fbf217f9d9c0e08f556c4"
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},
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{
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"url": "https://git.kernel.org/stable/c/b902890c62d200b3509cb5e09cf1e0a66553c128"
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}
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],
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"title": "mm/shrinker: do not hold RCU lock in shrinker_debugfs_count_show()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |