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CVE-2025-39735— jfs: fix slab-out-of-bounds read in ea_get()

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ea_get未正确处理大尺寸扩展属性，可能导致缓冲区溢出。

CVSS 7.1 · High EPSS 0.30% · P21

Affected Version Matrix 30

VendorProduct Version RangeStatus
Linux Linux 6e39b681d1eb16f408493bf5023788b57f68998c< 3d6fd5b9c6acbc005e53d0211c7381f566babec1 affected
bbf3f1fd8a0ac7df1db36a9b9e923041a14369f2< 50afcee7011155933d8d5e8832f52eeee018cfd3 affected
27a93c45e16ac25a0e2b5e5668e2d1beca56a478< 78c9cbde8880ec02d864c166bcb4fe989ce1d95f affected
9c356fc32a4480a2c0e537a05f2a8617633ddad0< 46e2c031aa59ea65128991cbca474bd5c0c2ecdb affected
9353cdf28d4c5c0ff19c5df7fbf81ea774de43a4< a8c31808925b11393a6601f534bb63bac5366bab affected
8c505ebeed8045b488b2e60b516c752b851f8437< 0beddc2a3f9b9cf7d8887973041e36c2d0fa3652 affected
d9f9d96136cba8fedd647d2c024342ce090133c2< 16d3d36436492aa248b2d8045e75585ebcc2f34d affected
d9f9d96136cba8fedd647d2c024342ce090133c2< 5263822558a8a7c0d0248d5679c2dcf4d5cda61f affected
… +22 more rows
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I. Basic Information for CVE-2025-39735

Vulnerability Information
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Vulnerability Title
jfs: fix slab-out-of-bounds read in ea_get()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: jfs: fix slab-out-of-bounds read in ea_get() During the "size_check" label in ea_get(), the code checks if the extended attribute list (xattr) size matches ea_size. If not, it logs "ea_get: invalid extended attribute" and calls print_hex_dump(). Here, EALIST_SIZE(ea_buf->xattr) returns 4110417968, which exceeds INT_MAX (2,147,483,647). Then ea_size is clamped: int size = clamp_t(int, ea_size, 0, EALIST_SIZE(ea_buf->xattr)); Although clamp_t aims to bound ea_size between 0 and 4110417968, the upper limit is treated as an int, causing an overflow above 2^31 - 1. This leads "size" to wrap around and become negative (-184549328). The "size" is then passed to print_hex_dump() (called "len" in print_hex_dump()), it is passed as type size_t (an unsigned type), this is then stored inside a variable called "int remaining", which is then assigned to "int linelen" which is then passed to hex_dump_to_buffer(). In print_hex_dump() the for loop, iterates through 0 to len-1, where len is 18446744073525002176, calling hex_dump_to_buffer() on each iteration: for (i = 0; i < len; i += rowsize) { linelen = min(remaining, rowsize); remaining -= rowsize; hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize, linebuf, sizeof(linebuf), ascii); ... } The expected stopping condition (i < len) is effectively broken since len is corrupted and very large. This eventually leads to the "ptr+i" being passed to hex_dump_to_buffer() to get closer to the end of the actual bounds of "ptr", eventually an out of bounds access is done in hex_dump_to_buffer() in the following for loop: for (j = 0; j < len; j++) { if (linebuflen < lx + 2) goto overflow2; ch = ptr[j]; ... } To fix this we should validate "EALIST_SIZE(ea_buf->xattr)" before it is utilised.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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ea_get未正确处理大尺寸扩展属性，可能导致缓冲区溢出。
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 6e39b681d1eb16f408493bf5023788b57f68998c ~ 3d6fd5b9c6acbc005e53d0211c7381f566babec1 -
Linux Linux 6.13 -

II. Public POCs for CVE-2025-39735

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III. Intelligence Information for CVE-2025-39735

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Other References for CVE-2025-39735 (7)

Same Patch Batch · Linux · 2025-04-18 · 23 CVEs total

CVE-2025-39930 8.4 HIGH ASoC: simple-card-utils: Don't use __free(device_node) at graph_util_parse_dai()
CVE-2025-40364 7.8 HIGH io_uring: fix io_req_prep_async with provided buffers
CVE-2025-37785 7.8 HIGH ext4: fix OOB read when checking dotdot dir
CVE-2025-37893 7.8 HIGH LoongArch: BPF: Fix off-by-one error in build_prologue()
CVE-2025-37838 7.8 HIGH HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Con
CVE-2025-39688 7.5 HIGH nfsd: allow SC_STATUS_FREEABLE when searching via nfs4_lookup_stateid()
CVE-2025-38479 dmaengine: fsl-edma: free irq correctly in remove path
CVE-2025-37860 sfc: fix NULL dereferences in ef100_process_design_param()
CVE-2025-37925 jfs: reject on-disk inodes of an unsupported type
CVE-2025-40325 md/raid10: wait barrier before returning discard request with REQ_NOWAIT
CVE-2025-38049 x86/resctrl: Fix allocation of cleanest CLOSID on platforms with no monitors
CVE-2025-38104 drm/amdgpu: Replace Mutex with Spinlock for RLCG register access to avoid Priority Inversi
CVE-2025-38152 remoteproc: core: Clear table_sz when rproc_shutdown
CVE-2025-38240 drm/mediatek: dp: drm_err => dev_err in HPD path to avoid NULL ptr
CVE-2025-40014 objtool, spi: amd: Fix out-of-bounds stack access in amd_set_spi_freq()
CVE-2025-38575 ksmbd: use aead_request_free to match aead_request_alloc
CVE-2025-38637 net_sched: skbprio: Remove overly strict queue assertions
CVE-2025-39728 clk: samsung: Fix UBSAN panic in samsung_clk_init()
CVE-2025-39755 staging: gpib: Fix cb7210 pcmcia Oops
CVE-2025-39778 objtool, nvmet: Fix out-of-bounds stack access in nvmet_ctrl_state_show()

Showing top 20 of 23 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39735

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