216 lines
11 KiB
JSON
216 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-2026-99174",
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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": "2026-09-25T10:25:14.399Z",
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"datePublished": "2026-10-28T10:35:28.758Z",
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"dateUpdated": "2026-10-30T12:42:37.969Z"
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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": "2026-10-30T12:42:37.969Z"
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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\next4: free the sbi after a grace period\n\next4_get_link() follows a symlink that keeps its target in a data block\nin rcu pathwalk mode with ext4_getblk(EXT4_GET_BLOCKS_CACHED_NOWAIT).\nThat reads s_mount_state in the ASSERT() of ext4_getblk() and again in\next4_es_lookup_extent(), and the lookup bumps the extent status hit or\nmiss counter, all through sb->s_fs_info.\n\next4_put_super() destroys those counters, clears sb->s_fs_info and frees\nthe sbi without waiting for a grace period. A pathwalk that is still in\next4_get_link() when the last reference to the mount goes away then\ndereferences a NULL s_fs_info, the freed sbi or the destroyed percpu\ncounters.\n\nWith a pathwalk held up in ext4_get_link() while the last reference\ngoes away:\n\n KASAN: null-ptr-deref in range [0x00000000000000a8-0x00000000000000af]\n RIP: 0010:ext4_getblk+0xf0/0x640\n Call Trace:\n <TASK>\n ext4_get_link+0x26c/0x410\n pick_link+0xf96/0x1780\n step_into_slowpath+0x9b8/0x1250\n path_lookupat+0x484/0xb00\n filename_lookup+0x1f1/0x5b0\n vfs_statx+0xd7/0x3b0\n vfs_fstatat+0x4d/0x90\n __do_sys_newfstatat+0xa0/0x100\n do_syscall_64+0x10e/0x5e0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nSo far that has been hard to hit. umount(2) waits for a grace period in\nnamespace_unlock() before it drops the mount, so only a mount whose last\nreference goes away elsewhere, like the close of a file or a chdir out of\na lazily unmounted directory, can race a walker.\n\nKeep sb->s_fs_info and free the sbi together with the extent status\ncounters after a grace period. Split the counters out of\next4_es_unregister_shrinker() for that. The shrinker still gets wasted\nin ext4_put_super(), the counters go with the sbi."
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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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"fs/ext4/ext4.h",
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"fs/ext4/extents-test.c",
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"fs/ext4/extents.c",
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"fs/ext4/extents_status.c",
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"fs/ext4/extents_status.h",
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"fs/ext4/super.c"
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],
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"versions": [
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{
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"version": "6493792d3299b3e33f887ef8a150099d271faf9c",
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"lessThan": "cf3bd5824c985b350d150bcd76698ee5e993fcba",
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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": "6493792d3299b3e33f887ef8a150099d271faf9c",
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"lessThan": "b4b0598fad51a978fcbda9d55eef6b5bd3cbe7d8",
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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": "6493792d3299b3e33f887ef8a150099d271faf9c",
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"lessThan": "4ce0e27ea610663a9cdc04e3bca38559147428d4",
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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": "6493792d3299b3e33f887ef8a150099d271faf9c",
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"lessThan": "80d5db1686b05fad6f384be017714297d828a714",
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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": "6493792d3299b3e33f887ef8a150099d271faf9c",
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"lessThan": "87d29b8b849738d52fe820d495fa0aa2d5a1ec82",
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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": "6493792d3299b3e33f887ef8a150099d271faf9c",
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"lessThan": "c17b44266a1f9fcb49b894d4611d1254bf1aa313",
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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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"fs/ext4/ext4.h",
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"fs/ext4/extents-test.c",
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"fs/ext4/extents.c",
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"fs/ext4/extents_status.c",
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"fs/ext4/extents_status.h",
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"fs/ext4/super.c"
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],
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"versions": [
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{
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"version": "5.19",
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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": "5.19",
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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": "6.1.191",
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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": "6.6.161",
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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": "6.12.115",
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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": "6.18.59",
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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": "7.2.13",
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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": "5.19",
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"versionEndExcluding": "6.1.191"
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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": "5.19",
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"versionEndExcluding": "6.6.161"
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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": "5.19",
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"versionEndExcluding": "6.12.115"
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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": "5.19",
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"versionEndExcluding": "6.18.59"
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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": "5.19",
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"versionEndExcluding": "7.2.13"
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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": "5.19",
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"versionEndExcluding": "7.3"
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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/cf3bd5824c985b350d150bcd76698ee5e993fcba"
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},
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{
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"url": "https://git.kernel.org/stable/c/b4b0598fad51a978fcbda9d55eef6b5bd3cbe7d8"
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},
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{
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"url": "https://git.kernel.org/stable/c/4ce0e27ea610663a9cdc04e3bca38559147428d4"
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},
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{
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"url": "https://git.kernel.org/stable/c/80d5db1686b05fad6f384be017714297d828a714"
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},
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{
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"url": "https://git.kernel.org/stable/c/87d29b8b849738d52fe820d495fa0aa2d5a1ec82"
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},
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{
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"url": "https://git.kernel.org/stable/c/c17b44266a1f9fcb49b894d4611d1254bf1aa313"
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}
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],
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"title": "ext4: free the sbi after a grace period",
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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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} |