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CVE-2025-39735

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.1 · Élevée
EPSS 0.3%
Linux•Linux•Versions : 6.13, <=6.1.*, <=6.12.*, <=6.14.*, <50afcee7011155933d8d5e8832f52eeee018cfd3, 5.15.180, <6.1.134, 0, <6.13, 9c356fc32a4480a2c0e537a05f2a8617633ddad0, <5263822558a8a7c0d0248d5679c2dcf4d5cda61f, 6.1.120, 5.10.231, 676a787048aafd4d1b38a522b05a9cc77e1b0a33, 8c505ebeed8045b488b2e60b516c752b851f8437, 5.15.174, 6.12.2, 6.6.64, <0beddc2a3f9b9cf7d8887973041e36c2d0fa3652, 6.14.2, 6.1.134, <4.20, <a8c31808925b11393a6601f534bb63bac5366bab, <5.10.236, <=5.10.*, <=6.6.*, 6.6.87, <6.12, 6.13.11, 6.12.23, 27a93c45e16ac25a0e2b5e5668e2d1beca56a478, <46e2c031aa59ea65128991cbca474bd5c0c2ecdb, <=5.4.*, d9f9d96136cba8fedd647d2c024342ce090133c2, 6.11.11, <3d6fd5b9c6acbc005e53d0211c7381f566babec1, <5.15.180, <6.6.87, <5.4.292, 4ea25fa8747fb8b1e5a11d87b852023ecf7ae420, <16d3d36436492aa248b2d8045e75585ebcc2f34d, 6.15, <78c9cbde8880ec02d864c166bcb4fe989ce1d95f, 6e39b681d1eb16f408493bf5023788b57f68998c, <fdf480da5837c23b146c4743c18de97202fcab37, 5.10.236, bbf3f1fd8a0ac7df1db36a9b9e923041a14369f2, <6.12.23, 9353cdf28d4c5c0ff19c5df7fbf81ea774de43a4, <=*, <=5.15.*, 5.4.287, 5.4.292, <=6.13.*, 4.19.325

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.

Gravité et risque d'exploitation

CVE-2025-39735 obtient un score CVSS de 7.1/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.30 %, ce qui la place devant 20.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 6.13, <=6.1.*, <=6.12.*, <=6.14.*, <50afcee7011155933d8d5e8832f52eeee018cfd3, 5.15.180, <6.1.134, 0, <6.13, 9c356fc32a4480a2c0e537a05f2a8617633ddad0, <5263822558a8a7c0d0248d5679c2dcf4d5cda61f, 6.1.120, 5.10.231, 676a787048aafd4d1b38a522b05a9cc77e1b0a33, 8c505ebeed8045b488b2e60b516c752b851f8437, 5.15.174, 6.12.2, 6.6.64, <0beddc2a3f9b9cf7d8887973041e36c2d0fa3652, 6.14.2, 6.1.134, <4.20, <a8c31808925b11393a6601f534bb63bac5366bab, <5.10.236, <=5.10.*, <=6.6.*, 6.6.87, <6.12, 6.13.11, 6.12.23, 27a93c45e16ac25a0e2b5e5668e2d1beca56a478, <46e2c031aa59ea65128991cbca474bd5c0c2ecdb, <=5.4.*, d9f9d96136cba8fedd647d2c024342ce090133c2, 6.11.11, <3d6fd5b9c6acbc005e53d0211c7381f566babec1, <5.15.180, <6.6.87, <5.4.292, 4ea25fa8747fb8b1e5a11d87b852023ecf7ae420, <16d3d36436492aa248b2d8045e75585ebcc2f34d, 6.15, <78c9cbde8880ec02d864c166bcb4fe989ce1d95f, 6e39b681d1eb16f408493bf5023788b57f68998c, <fdf480da5837c23b146c4743c18de97202fcab37, 5.10.236, bbf3f1fd8a0ac7df1db36a9b9e923041a14369f2, <6.12.23, 9353cdf28d4c5c0ff19c5df7fbf81ea774de43a4, <=*, <=5.15.*, 5.4.287, 5.4.292, <=6.13.*, 4.19.325) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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