147 lines
8.3 KiB
JSON
147 lines
8.3 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-2026-92500",
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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": "2026-09-16T12:21:13.871Z",
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"datePublished": "2026-09-17T16:10:14.073Z",
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"dateUpdated": "2026-10-19T09:04:06.284Z"
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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": "2026-10-19T09:04:06.284Z"
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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: use fsdata to track inline data write state and fix race\n\nInstead of checking the live inode state (ext4_has_inline_data(inode)\nand ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) in the\nwrite_end handlers, use the fsdata parameter of the address space\noperations to explicitly pass down the state in which write_begin\nprepared the write.\n\nA concurrent thread (such as ext4_page_mkwrite()) can convert the\ninline data to an extent between write_begin and write_end. If this\nhappens, the write_end handlers would previously miss the inline\nwrite_end path and fall through to extent-based write_end logic.\nHowever, since block buffers were never allocated in write_begin,\nthis resulted in NULL pointer dereferences or data loss because\nfolio_buffers(folio) was NULL.\n\nDefine EXT4_WRITE_DATA_INLINE (4) as a bit flag (Bit 2), treating\nfsdata as bitwise flags rather than mutually exclusive enums to keep\nstates of the write path independent. Communicate this state via\nfsdata:\n1) ext4_write_begin() and ext4_da_write_begin() set the\n EXT4_WRITE_DATA_INLINE bit in *fsdata via bitwise OR when an inline\n write is successfully prepared.\n2) On entry, ext4_write_begin() clears the EXT4_WRITE_DATA_INLINE bit\n to safely handle VFS retries (where generic_perform_write() bypasses\n the fsdata initialization on its retry jump).\n3) The write_end handlers perform a bitwise AND to check if the\n EXT4_WRITE_DATA_INLINE bit is set and invoke the inline write_end\n helper accordingly.\n\nFurthermore, during a buffered write, ext4_write_inline_data_end()\nacquires the xattr lock after preparing the write. If a concurrent\npage fault (ext4_page_mkwrite()) converts the inline data to an extent\nafter the write_end handlers check the state but before\next4_write_inline_data_end() acquires the xattr write lock, the\nsubsequent check will trigger a kernel panic via\nBUG_ON(!ext4_has_inline_data(inode)).\n\nTo keep git history working and bisectability clean, replace the\nBUG_ON check in ext4_write_inline_data_end() with a graceful error-\nhandling retry path in this same commit. If the inline data is cleared\nafter locking the xattr, we safely release all resources (releasing\niloc.bh, unlocking/putting the folio, stopping the active journal\ntransaction handle) and return 0 (VFS retry) to let the generic write\npath retry the operation safely."
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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/inline.c",
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"fs/ext4/inode.c"
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],
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"versions": [
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{
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"version": "3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb",
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"lessThan": "bd8d74bd46d09905164255b8635fa58b45f41068",
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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": "3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb",
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"lessThan": "439aedfd7ae868d1d7b4930afe66091cb979cd5c",
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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": "3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb",
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"lessThan": "7edbb323bab2b2a609016014caafdb651c898249",
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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/inline.c",
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"fs/ext4/inode.c"
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],
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"versions": [
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{
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"version": "3.8",
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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": "3.8",
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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": "6.18.52",
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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": "7.2.6",
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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": "3.8",
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"versionEndExcluding": "6.18.52"
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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": "3.8",
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"versionEndExcluding": "7.2.6"
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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": "3.8",
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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/bd8d74bd46d09905164255b8635fa58b45f41068"
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},
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{
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"url": "https://git.kernel.org/stable/c/439aedfd7ae868d1d7b4930afe66091cb979cd5c"
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},
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{
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"url": "https://git.kernel.org/stable/c/7edbb323bab2b2a609016014caafdb651c898249"
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}
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],
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"title": "ext4: use fsdata to track inline data write state and fix race",
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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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} |