222 lines
11 KiB
JSON
222 lines
11 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-2026-98983",
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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": "2026-09-25T10:25:14.384Z",
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"datePublished": "2026-10-23T12:20:00.918Z",
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"dateUpdated": "2026-10-23T12:20:00.918Z"
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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": "2026-10-23T12:20:00.918Z"
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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\nunshare: don't drop active namespace references that were never taken\n\nActive references on the namespaces of an nsproxy are taken when the\nnsproxy is installed into a task in switch_task_namespaces() and\ncopy_namespaces() and dropped again by put_nsproxy() through\ndeactivate_nsproxy().\n\nBut ksys_unshare() calls put_nsproxy() on an nsproxy that was never\ninstalled when set_cred_ucounts() fails. The new namespaces of that\nnsproxy go from zero to minus one and the namespaces shared with the\ncaller lose a reference that belongs to the nsproxy the caller keeps\nusing:\n\n WARNING: kernel/nscommon.c:171 at __ns_ref_active_put+0x1cd/0x230\n nsproxy_ns_active_put\n deactivate_nsproxy\n ksys_unshare\n\nAfterwards the namespaces the caller lives in aren't listed by listns()\nanymore. set_cred_ucounts() only fails when alloc_ucounts() can't\nallocate and it only allocates when the real uid of the caller differs\nfrom its effective uid.\n\nCommit cefd55bd2159 (\"nsproxy: fix free_nsproxy() and simplify\ncreate_new_namespaces()\") separated the two cases on purpose.\nnsproxy_free() frees an nsproxy that was prepared but never installed\nand that's what a failed setns() uses in put_nsset(). Export it and use\nit for a failed unshare() as well."
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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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"include/linux/nsproxy.h",
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"kernel/fork.c",
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"kernel/nsproxy.c"
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],
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"versions": [
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{
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"version": "a98621a0f187a934c115dcfe79a49520ae892111",
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"lessThan": "56fe03a0c05dba4c5f6a23c391f96de1614a098c",
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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": "a98621a0f187a934c115dcfe79a49520ae892111",
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"lessThan": "0b6f31a3c0b16066f812e94b52a704174a6f23cd",
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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": "27ae6b17c9ba7ff353ab0906297f08aa845782b4",
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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": "297261b343371c4f0b31055d53d285138ec21565",
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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": "813a47b0309097da71781ee4ac11922e39b67d55",
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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": "6e608e3e5ce12ce7fd21e46212eccca37f917d0e",
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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": "a261fccdb4ac58ec5ba6aa1d92a6cc418fff301f",
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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": "665dc1ed16357988d439fc5bbc860ee36f540d81",
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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": "5.15.209",
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"lessThan": "5.16",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.1.175",
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"lessThan": "6.2",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.6.141",
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"lessThan": "6.7",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.12.91",
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"lessThan": "6.13",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.18.33",
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"lessThan": "6.19",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "7.0.10",
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"lessThan": "7.1",
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"status": "affected",
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"versionType": "semver"
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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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"include/linux/nsproxy.h",
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"kernel/fork.c",
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"kernel/nsproxy.c"
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],
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"versions": [
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{
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"version": "7.1",
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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": "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": "7.2.11",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "7.1",
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"versionEndExcluding": "7.2.11"
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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": "7.1",
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"versionEndExcluding": "7.3"
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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": "5.15.209"
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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": "6.1.175"
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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": "6.6.141"
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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": "6.12.91"
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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": "6.18.33"
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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": "7.0.10"
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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/56fe03a0c05dba4c5f6a23c391f96de1614a098c"
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},
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{
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"url": "https://git.kernel.org/stable/c/0b6f31a3c0b16066f812e94b52a704174a6f23cd"
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}
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],
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"title": "unshare: don't drop active namespace references that were never taken",
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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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} |