CVE-2026-98405— smb: client: fix missing iov bounds check in parse_posix_sids()
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix missing iov bounds check in parse_posix_sids() In parse_posix_sids(), sidsbuf_end is calculated using the server-supplied out_len without being validated against the actual le
Affected Version Matrix 10
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | a90f37e3d7acfd9824f162830583bbf7846fe252< d91b9a3b2b38e5ac1b51e9e5b23fe53ad7b49644 |
affected |
a90f37e3d7acfd9824f162830583bbf7846fe252< b862996e5105be1293da9cdc85da77b76021c3bd |
affected | ||
a90f37e3d7acfd9824f162830583bbf7846fe252< 2f8ed71aaaba3bc8b19cd9930cc62e63e142b299 |
affected | ||
a90f37e3d7acfd9824f162830583bbf7846fe252< eac6917a42899aad0617bbf04798c5dd946a1fe5 |
affected | ||
a90f37e3d7acfd9824f162830583bbf7846fe252< b09d092eb24ad0110f16a9b7c1ed5d2a0c1733dc |
affected | ||
6.6.32< 6.6.158 |
affected | ||
6.6.32< 6.12.112 |
affected | ||
6.6.32< 6.18.54 |
affected | ||
| … +2 more rows | |||
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I. Basic Information for CVE-2026-98405
Vulnerability Information
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Vulnerability Title
smb: client: fix missing iov bounds check in parse_posix_sids()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix missing iov bounds check in parse_posix_sids()
In parse_posix_sids(), sidsbuf_end is calculated using the server-supplied
out_len without being validated against the actual length of the received
iov (iov_len).
If a server provides an inflated out_len, sidsbuf_end will point past the
end of the iov. This defeats the bounds guards in posix_info_sid_size(),
allowing out-of-bounds reads into adjacent kernel memory.
Fix this by rejecting responses where the calculated sidsbuf_end would
exceed the received iov boundaries or cause pointer wraparound.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-98405
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-98405 (5)
Same Patch Batch · Linux · 2026-10-14 · 46 CVEs total
| CVE-2026-98398 | locking/lockdep: Invalidate stale class_cache entries for zapped classes | |
| CVE-2026-98396 | powerpc: Do not restore KUAP in arch_exit_to_user_mode_prepare() | |
| CVE-2026-98393 | net: ipv4: Fix UDP length overflow with PMTU discover and big MTU | |
| CVE-2026-98391 | drm/xe: Guard page-fault worker with runtime PM check | |
| CVE-2026-98389 | drm/amdgpu: skip gfx switch_power_profile during GPU reset | |
| CVE-2026-98388 | exec: do_close_on_exec() before taking exec_update_lock | |
| CVE-2026-98387 | s390/crypto: Fix skcipher_walk return code handling in aes_s390 | |
| CVE-2026-98386 | scsi: qla2xxx: Use memset_io() to clear QLAFX00 request ring slot | |
| CVE-2026-98390 | x86/amd_node: Avoid divide by zero on virtualized systems | |
| CVE-2026-98397 | platform/x86: x86-android-tablets: hold device reference for secondary fwnode teardown | |
| CVE-2026-98395 | powerpc/entry: Fix irq_soft_mask corruption on replayed interrupt exit | |
| CVE-2026-98399 | s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block | |
| CVE-2026-98400 | s390/ipl: Fix NULL deref in kdump without re-IPL parm block | |
| CVE-2026-98402 | net: icmp: avoid invalid transport header access in icmp_send tracepoint | |
| CVE-2026-98401 | net: iptunnel: fix stale transport header during tunnel decapsulation | |
| CVE-2026-98403 | s390/boot: Avoid IPL parameter append past command line | |
| CVE-2026-98404 | drm/virtio: Fix a NULL vs ERR_PTR() bug in virtio_gpu_user_framebuffer_create() | |
| CVE-2026-98406 | wifi: mac80211: avoid WARN in set_bitrate_mask when sdata not in driver | |
| CVE-2026-98408 | watchdog: rzv2h: Avoid division by zero | |
| CVE-2026-98407 | wifi: rsi: fix heap OOB write on key removal |
Showing top 20 of 46 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
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CVE-2026-98431
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Same vendor: Linux
-
CVE-2026-98431
RDMA/uverbs: Fix mmap_lock/disassociation_lock circular depe -
CVE-2026-98430
RDMA/efa: Keep admin queues alive while IRQ is registered -
CVE-2026-98429
RDMA/efa: Keep EQ resources alive while IRQ is registered -
CVE-2026-98427
net/sched: codel: bound the dropping loop per dequeue call -
CVE-2026-98428
ALSA: usb: 6fire: Avoid embedded URBs
V. Comments for CVE-2026-98405
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