203 lines
11 KiB
JSON
203 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-2025-40237",
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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": "2025-04-16T07:20:57.181Z",
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"datePublished": "2025-12-04T15:31:27.325Z",
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"dateUpdated": "2026-05-23T16:01:45.934Z"
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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": "2026-05-23T16:01:45.934Z"
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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\nfs/notify: call exportfs_encode_fid with s_umount\n\nCalling intotify_show_fdinfo() on fd watching an overlayfs inode, while\nthe overlayfs is being unmounted, can lead to dereferencing NULL ptr.\n\nThis issue was found by syzkaller.\n\nRace Condition Diagram:\n\nThread 1 Thread 2\n-------- --------\n\ngeneric_shutdown_super()\n shrink_dcache_for_umount\n sb->s_root = NULL\n\n |\n | vfs_read()\n | inotify_fdinfo()\n | * inode get from mark *\n | show_mark_fhandle(m, inode)\n | exportfs_encode_fid(inode, ..)\n | ovl_encode_fh(inode, ..)\n | ovl_check_encode_origin(inode)\n | * deref i_sb->s_root *\n |\n |\n v\n fsnotify_sb_delete(sb)\n\nWhich then leads to:\n\n[ 32.133461] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI\n[ 32.134438] KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]\n[ 32.135032] CPU: 1 UID: 0 PID: 4468 Comm: systemd-coredum Not tainted 6.17.0-rc6 #22 PREEMPT(none)\n\n<snip registers, unreliable trace>\n\n[ 32.143353] Call Trace:\n[ 32.143732] ovl_encode_fh+0xd5/0x170\n[ 32.144031] exportfs_encode_inode_fh+0x12f/0x300\n[ 32.144425] show_mark_fhandle+0xbe/0x1f0\n[ 32.145805] inotify_fdinfo+0x226/0x2d0\n[ 32.146442] inotify_show_fdinfo+0x1c5/0x350\n[ 32.147168] seq_show+0x530/0x6f0\n[ 32.147449] seq_read_iter+0x503/0x12a0\n[ 32.148419] seq_read+0x31f/0x410\n[ 32.150714] vfs_read+0x1f0/0x9e0\n[ 32.152297] ksys_read+0x125/0x240\n\nIOW ovl_check_encode_origin derefs inode->i_sb->s_root, after it was set\nto NULL in the unmount path.\n\nFix it by protecting calling exportfs_encode_fid() from\nshow_mark_fhandle() with s_umount lock.\n\nThis form of fix was suggested by Amir in [1].\n\n[1]: https://lore.kernel.org/all/CAOQ4uxhbDwhb+2Brs1UdkoF0a3NSdBAOQPNfEHjahrgoKJpLEw@mail.gmail.com/"
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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/notify/fdinfo.c"
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],
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"versions": [
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{
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"version": "a1a541fbfa7e97c1100144db34b57553d7164ce5",
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"lessThan": "950b604384fd75d62e860bec7135b2b62eb4d508",
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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": "f0c0ac84de17c37e6e84da65fb920f91dada55ad",
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"lessThan": "bc1c6b803e14ea2b8f7e33b7164013f666ceb656",
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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": "3c7c90274ae339e1ad443c9be1c67a20b80b9c76",
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"lessThan": "3f307a9f7a7a2822e38ac451b73e2244e7279496",
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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": "c45beebfde34aa71afbc48b2c54cdda623515037",
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"lessThan": "d1894bc542becb0fda61e7e513b09523cab44030",
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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": "c45beebfde34aa71afbc48b2c54cdda623515037",
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"lessThan": "a7c4bb43bfdc2b9f06ee9d036028ed13a83df42a",
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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": "6.6.72",
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"lessThan": "6.6.73",
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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": "6.6.74",
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"lessThan": "6.6.115",
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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": "6.12.10",
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"lessThan": "6.12.56",
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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/notify/fdinfo.c"
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],
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"versions": [
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{
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"version": "6.13",
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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": "6.13",
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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": "6.6.73",
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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": "6.6.115",
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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": "6.12.56",
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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": "6.17.6",
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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": "6.6.72",
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"versionEndExcluding": "6.6.73"
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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": "6.6.74",
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"versionEndExcluding": "6.6.115"
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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": "6.12.10",
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"versionEndExcluding": "6.12.56"
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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": "6.13",
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"versionEndExcluding": "6.17.6"
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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": "6.13",
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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/950b604384fd75d62e860bec7135b2b62eb4d508"
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},
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{
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"url": "https://git.kernel.org/stable/c/bc1c6b803e14ea2b8f7e33b7164013f666ceb656"
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},
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{
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"url": "https://git.kernel.org/stable/c/3f307a9f7a7a2822e38ac451b73e2244e7279496"
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},
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{
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"url": "https://git.kernel.org/stable/c/d1894bc542becb0fda61e7e513b09523cab44030"
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},
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{
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"url": "https://git.kernel.org/stable/c/a7c4bb43bfdc2b9f06ee9d036028ed13a83df42a"
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}
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],
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"title": "fs/notify: call exportfs_encode_fid with s_umount",
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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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} |