122 lines
8.4 KiB
JSON
122 lines
8.4 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-2025-40295",
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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": "2025-04-16T07:20:57.185Z",
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"datePublished": "2025-12-08T00:46:18.950Z",
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"dateUpdated": "2026-05-11T21:46:35.245Z"
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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": "2026-05-11T21:46:35.245Z"
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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\nfscrypt: fix left shift underflow when inode->i_blkbits > PAGE_SHIFT\n\nWhen simulating an nvme device on qemu with both logical_block_size and\nphysical_block_size set to 8 KiB, an error trace appears during\npartition table reading at boot time. The issue is caused by\ninode->i_blkbits being larger than PAGE_SHIFT, which leads to a left\nshift of -1 and triggering a UBSAN warning.\n\n[ 2.697306] ------------[ cut here ]------------\n[ 2.697309] UBSAN: shift-out-of-bounds in fs/crypto/inline_crypt.c:336:37\n[ 2.697311] shift exponent -1 is negative\n[ 2.697315] CPU: 3 UID: 0 PID: 274 Comm: (udev-worker) Not tainted 6.18.0-rc2+ #34 PREEMPT(voluntary)\n[ 2.697317] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n[ 2.697320] Call Trace:\n[ 2.697324] <TASK>\n[ 2.697325] dump_stack_lvl+0x76/0xa0\n[ 2.697340] dump_stack+0x10/0x20\n[ 2.697342] __ubsan_handle_shift_out_of_bounds+0x1e3/0x390\n[ 2.697351] bh_get_inode_and_lblk_num.cold+0x12/0x94\n[ 2.697359] fscrypt_set_bio_crypt_ctx_bh+0x44/0x90\n[ 2.697365] submit_bh_wbc+0xb6/0x190\n[ 2.697370] block_read_full_folio+0x194/0x270\n[ 2.697371] ? __pfx_blkdev_get_block+0x10/0x10\n[ 2.697375] ? __pfx_blkdev_read_folio+0x10/0x10\n[ 2.697377] blkdev_read_folio+0x18/0x30\n[ 2.697379] filemap_read_folio+0x40/0xe0\n[ 2.697382] filemap_get_pages+0x5ef/0x7a0\n[ 2.697385] ? mmap_region+0x63/0xd0\n[ 2.697389] filemap_read+0x11d/0x520\n[ 2.697392] blkdev_read_iter+0x7c/0x180\n[ 2.697393] vfs_read+0x261/0x390\n[ 2.697397] ksys_read+0x71/0xf0\n[ 2.697398] __x64_sys_read+0x19/0x30\n[ 2.697399] x64_sys_call+0x1e88/0x26a0\n[ 2.697405] do_syscall_64+0x80/0x670\n[ 2.697410] ? __x64_sys_newfstat+0x15/0x20\n[ 2.697414] ? x64_sys_call+0x204a/0x26a0\n[ 2.697415] ? do_syscall_64+0xb8/0x670\n[ 2.697417] ? irqentry_exit_to_user_mode+0x2e/0x2a0\n[ 2.697420] ? irqentry_exit+0x43/0x50\n[ 2.697421] ? exc_page_fault+0x90/0x1b0\n[ 2.697422] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[ 2.697425] RIP: 0033:0x75054cba4a06\n[ 2.697426] Code: 5d e8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 75 19 83 e2 39 83 fa 08 75 11 e8 26 ff ff ff 66 0f 1f 44 00 00 48 8b 45 10 0f 05 <48> 8b 5d f8 c9 c3 0f 1f 40 00 f3 0f 1e fa 55 48 89 e5 48 83 ec 08\n[ 2.697427] RSP: 002b:00007fff973723a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000\n[ 2.697430] RAX: ffffffffffffffda RBX: 00005ea9a2c02760 RCX: 000075054cba4a06\n[ 2.697432] RDX: 0000000000002000 RSI: 000075054c190000 RDI: 000000000000001b\n[ 2.697433] RBP: 00007fff973723c0 R08: 0000000000000000 R09: 0000000000000000\n[ 2.697434] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000\n[ 2.697434] R13: 00005ea9a2c027c0 R14: 00005ea9a2be5608 R15: 00005ea9a2be55f0\n[ 2.697436] </TASK>\n[ 2.697436] ---[ end trace ]---\n\nThis situation can happen for block devices because when\nCONFIG_TRANSPARENT_HUGEPAGE is enabled, the maximum logical_block_size\nis 64 KiB. set_init_blocksize() then sets the block device\ninode->i_blkbits to 13, which is within this limit.\n\nFile I/O does not trigger this problem because for filesystems that do\nnot support the FS_LBS feature, sb_set_blocksize() prevents\nsb->s_blocksize_bits from being larger than PAGE_SHIFT. During inode\nallocation, alloc_inode()->inode_init_always() assigns inode->i_blkbits\nfrom sb->s_blocksize_bits. Currently, only xfs_fs_type has the FS_LBS\nflag, and since xfs I/O paths do not reach submit_bh_wbc(), it does not\nhit the left-shift underflow issue.\n\n[EB: use folio_pos() and consolidate the two shifts by i_blkbits]"
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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/crypto/inline_crypt.c"
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],
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"versions": [
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{
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"version": "47dd67532303803a87f43195e088b3b4bcf0454d",
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"lessThan": "dde026c5d2a5870f97924d5b512adf2b93fb7153",
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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": "47dd67532303803a87f43195e088b3b4bcf0454d",
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"lessThan": "1e39da974ce621ed874c6d3aaf65ad14848c9f0d",
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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/crypto/inline_crypt.c"
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],
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"versions": [
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{
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"version": "6.15",
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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": "6.15",
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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": "6.17.8",
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"lessThanOrEqual": "6.17.*",
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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",
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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": "6.15",
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"versionEndExcluding": "6.17.8"
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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": "6.15",
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"versionEndExcluding": "6.18"
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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/dde026c5d2a5870f97924d5b512adf2b93fb7153"
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},
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{
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"url": "https://git.kernel.org/stable/c/1e39da974ce621ed874c6d3aaf65ad14848c9f0d"
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}
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],
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"title": "fscrypt: fix left shift underflow when inode->i_blkbits > PAGE_SHIFT",
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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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} |