379 lines
19 KiB
JSON
379 lines
19 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-2026-80808",
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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": "2026-08-26T14:34:25.794Z",
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"datePublished": "2026-09-04T15:13:28.562Z",
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"dateUpdated": "2026-11-06T17:05:54.814Z"
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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": "2026-10-19T08:44:01.677Z"
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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: stop retrying saturated xattr cache entries\n\next4_xattr_block_set() retries when a cache entry selected for reuse\nhas a saturated reference count after taking the buffer lock. The retry\nreturns to the mbcache lookup without making that entry ineligible, so\nit can select the same unusable entry indefinitely. A task spinning\nthere can hold the parent directory's i_rwsem and leave concurrent\nrmdir callers blocked.\n\nNormally a reusable entry has a reference count below\nEXT4_XATTR_REFCOUNT_MAX because the count and MBE_REUSABLE_B are\nupdated under the same buffer lock. A corrupted filesystem can violate\nthat invariant. The syzbot reproducer reports allocator and xattr\ncorruption before triggering this retry loop.\n\nCheck the untrusted on-disk count before incrementing it, avoiding\noverflow, and clear MBE_REUSABLE_B when it is already saturated. The\nnext lookup then skips the entry that was just proven unusable. This\nmirrors the normal transition at EXT4_XATTR_REFCOUNT_MAX; the release\npath marks the entry reusable again on the exact 1024-to-1023\ntransition.\n\nUsing the same QEMU harness and guest parameters, current unpatched\nLinux hung in 6 of 8 420-second trials with the do_rmdir signature;\nrepresentative NMI backtraces caught the owner spinning in\next4_xattr_block_set(). The patched kernel completed 28 of 28 trials\nwithout a hung-task report; the final twelve trials exercised the\nreviewed overflow-safe form of the change. syzbot's patch testing also\ncompleted without reproducing the hang."
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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/xattr.c"
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],
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"versions": [
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{
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"version": "1a56cd972ce121b6cf2517a47a578782bbd2ec95",
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"lessThan": "119a2f053242ed75bdd2ebc95baf3ae7db6ccacf",
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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": "1be97463696c7291a3e1547614e96432b0bd3add",
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"lessThan": "61631352a5b405c89be579de00903b72e6888aa4",
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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": "65f8b80053a1b2fd602daa6814e62d6fa90e5e9b",
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"lessThan": "8865cd664484517703df5c18a965dc3227572b87",
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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": "65f8b80053a1b2fd602daa6814e62d6fa90e5e9b",
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"lessThan": "a40c45268f4358207aa9c53764fed2e05f62986a",
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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": "65f8b80053a1b2fd602daa6814e62d6fa90e5e9b",
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"lessThan": "889ec86464d261f026f6c334040cfc6c58c99d58",
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"status": "affected",
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},
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{
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"version": "65f8b80053a1b2fd602daa6814e62d6fa90e5e9b",
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"lessThan": "4902a5cba21aeaf91e6b29e20e0967a5f6abdcd9",
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"status": "affected",
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},
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{
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"version": "65f8b80053a1b2fd602daa6814e62d6fa90e5e9b",
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"lessThan": "55ee6533c1db7f7656fa8dd19637f3f8b8c08dc5",
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"status": "affected",
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},
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{
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"version": "65f8b80053a1b2fd602daa6814e62d6fa90e5e9b",
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"lessThan": "dbd4aea175ad3c46436acb251e817b4374628072",
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"status": "affected",
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},
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{
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"version": "65f8b80053a1b2fd602daa6814e62d6fa90e5e9b",
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"lessThan": "54b6bd40898de7906acb2bccc9a96d1b8e6b4323",
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"status": "affected",
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},
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{
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"version": "98953044b3cdb2cb7d82e7365b659e2ed4f4ca4d",
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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": "af8ecc8d20e72130771cc076bce7fcf17ccda6c4",
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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": "c6fac5cf5a5098732623bcd00a8a3eb9f5465144",
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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": "96fa141fa295ae9428da73c56c9852053b575c04",
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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": "5.10.163",
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"lessThan": "5.10.267",
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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": "5.15.61",
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"lessThan": "5.15.218",
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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": "4.19.270",
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"lessThan": "4.20",
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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": "5.4.229",
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"lessThan": "5.5",
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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": "5.18.18",
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"lessThan": "5.19",
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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": "5.19.2",
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"lessThan": "5.20",
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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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"fs/ext4/xattr.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": "5.10.267",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.218",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.185",
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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": "6.6.154",
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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": "6.12.106",
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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": "6.18.47",
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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": "7.1.11",
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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": "7.2.1",
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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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"operator": "OR",
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"negate": false,
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/119a2f053242ed75bdd2ebc95baf3ae7db6ccacf"
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},
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{
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"url": "https://git.kernel.org/stable/c/61631352a5b405c89be579de00903b72e6888aa4"
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},
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{
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"url": "https://git.kernel.org/stable/c/8865cd664484517703df5c18a965dc3227572b87"
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},
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{
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"url": "https://git.kernel.org/stable/c/a40c45268f4358207aa9c53764fed2e05f62986a"
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},
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{
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"url": "https://git.kernel.org/stable/c/889ec86464d261f026f6c334040cfc6c58c99d58"
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},
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{
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"url": "https://git.kernel.org/stable/c/4902a5cba21aeaf91e6b29e20e0967a5f6abdcd9"
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},
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{
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"url": "https://git.kernel.org/stable/c/55ee6533c1db7f7656fa8dd19637f3f8b8c08dc5"
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},
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{
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"url": "https://git.kernel.org/stable/c/dbd4aea175ad3c46436acb251e817b4374628072"
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},
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{
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"url": "https://git.kernel.org/stable/c/54b6bd40898de7906acb2bccc9a96d1b8e6b4323"
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}
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],
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"title": "ext4: stop retrying saturated xattr cache entries",
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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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-80808",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-11-06T17:03:39.373344Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-11-06T17:05:54.814Z"
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}
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}
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]
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}
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} |