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CVE-2025-68794— iomap: adjust read range correctly for non-block-aligned positions

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.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于iomap_adjust_read_range函数对非块对齐位置计算错误，可能导致越界读取。

CVSS 9.8 · Critical EPSS 0.60% · P48

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 9dc55f1389f9569acf9659e58dd836a9c70df217< ce20f49ac9194cf81a77f01d1c316d7c17ae753c affected
9dc55f1389f9569acf9659e58dd836a9c70df217< 275b37a1e5c2c8abd313e8075f6aec9a349f291b affected
9dc55f1389f9569acf9659e58dd836a9c70df217< b8c9f25fd84328c5fcc4f70c6d1e8f1d4787eaac affected
9dc55f1389f9569acf9659e58dd836a9c70df217< 82b60ffbb532d919959702768dca04c3c0500ae5 affected
9dc55f1389f9569acf9659e58dd836a9c70df217< 12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e affected
9dc55f1389f9569acf9659e58dd836a9c70df217< 142194fb21afe964d2d194cab1fc357cbf87e899 affected
9dc55f1389f9569acf9659e58dd836a9c70df217< 7aa6bc3e8766990824f66ca76c19596ce10daf3e affected
4.19 affected
… +8 more rows
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I. Basic Information for CVE-2025-68794

Vulnerability Information
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Vulnerability Title
iomap: adjust read range correctly for non-block-aligned positions
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: iomap: adjust read range correctly for non-block-aligned positions iomap_adjust_read_range() assumes that the position and length passed in are block-aligned. This is not always the case however, as shown in the syzbot generated case for erofs. This causes too many bytes to be skipped for uptodate blocks, which results in returning the incorrect position and length to read in. If all the blocks are uptodate, this underflows length and returns a position beyond the folio. Fix the calculation to also take into account the block offset when calculating how many bytes can be skipped for uptodate blocks.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于iomap_adjust_read_range函数对非块对齐位置计算错误，可能导致越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 9dc55f1389f9569acf9659e58dd836a9c70df217 ~ ce20f49ac9194cf81a77f01d1c316d7c17ae753c -
Linux Linux 4.19 -

II. Public POCs for CVE-2025-68794

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III. Intelligence Information for CVE-2025-68794

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Other References for CVE-2025-68794 (3)

Same Patch Batch · Linux · 2026-01-13 · 93 CVEs total

CVE-2025-68817 9.8 CRITICAL ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency
CVE-2025-68811 9.8 CRITICAL svcrdma: use rc_pageoff for memcpy byte offset
CVE-2025-71068 9.8 CRITICAL svcrdma: bound check rq_pages index in inline path
CVE-2025-68775 9.8 CRITICAL net/handshake: duplicate handshake cancellations leak socket
CVE-2025-71093 9.1 CRITICAL e1000: fix OOB in e1000_tbi_should_accept()
CVE-2025-68809 9.1 CRITICAL ksmbd: vfs: fix race on m_flags in vfs_cache
CVE-2025-71095 9.1 CRITICAL net: stmmac: fix the crash issue for zero copy XDP_TX action
CVE-2025-68818 8.8 HIGH scsi: Revert "scsi: qla2xxx: Perform lockless command completion in abort path"
CVE-2025-71072 8.2 HIGH shmem: fix recovery on rename failures
CVE-2025-68799 8.1 HIGH caif: fix integer underflow in cffrml_receive()
CVE-2025-68803 8.0 HIGH NFSD: NFSv4 file creation neglects setting ACL
CVE-2025-71078 7.8 HIGH powerpc/64s/slb: Fix SLB multihit issue during SLB preload
CVE-2025-71082 7.8 HIGH Bluetooth: btusb: revert use of devm_kzalloc in btusb
CVE-2025-68801 7.8 HIGH mlxsw: spectrum_router: Fix neighbour use-after-free
CVE-2025-71074 7.8 HIGH functionfs: fix the open/removal races
CVE-2025-68795 7.8 HIGH ethtool: Avoid overflowing userspace buffer on stats query
CVE-2025-68819 7.8 HIGH media: dvb-usb: dtv5100: fix out-of-bounds in dtv5100_i2c_msg()
CVE-2025-68800 7.8 HIGH mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats
CVE-2025-68792 7.8 HIGH tpm2-sessions: Fix out of range indexing in name_size
CVE-2025-68793 7.8 HIGH drm/amdgpu: fix a job->pasid access race in gpu recovery

Showing top 20 of 93 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-68794

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