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GHSA-JG9P-QRJ8-5JW6

Vulnerability from github – Published: 2025-04-14 18:31 – Updated: 2025-04-14 18:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

jffs2: fix memory leak in jffs2_scan_medium

If an error is returned in jffs2_scan_eraseblock() and some memory has been added to the jffs2_summary *s, we can observe the following kmemleak report:

unreferenced object 0xffff88812b889c40 (size 64): comm "mount", pid 692, jiffies 4294838325 (age 34.288s) hex dump (first 32 bytes): 40 48 b5 14 81 88 ff ff 01 e0 31 00 00 00 50 00 @H........1...P. 00 00 01 00 00 00 01 00 00 00 02 00 00 00 09 08 ................ backtrace: [] __kmalloc+0x613/0x910 [] jffs2_sum_add_dirent_mem+0x5c/0xa0 [] jffs2_scan_medium.cold+0x36e5/0x4794 [] jffs2_do_mount_fs.cold+0xa7/0x2267 [] jffs2_do_fill_super+0x383/0xc30 [] jffs2_fill_super+0x2ea/0x4c0 [] mtd_get_sb+0x254/0x400 [] mtd_get_sb_by_nr+0x4f/0xd0 [] get_tree_mtd+0x498/0x840 [] jffs2_get_tree+0x25/0x30 [] vfs_get_tree+0x8d/0x2e0 [] path_mount+0x50f/0x1e50 [] do_mount+0x107/0x130 [] __se_sys_mount+0x1c5/0x2f0 [] __x64_sys_mount+0xc7/0x160 [] do_syscall_64+0x45/0x70 unreferenced object 0xffff888114b54840 (size 32): comm "mount", pid 692, jiffies 4294838325 (age 34.288s) hex dump (first 32 bytes): c0 75 b5 14 81 88 ff ff 02 e0 02 00 00 00 02 00 .u.............. 00 00 84 00 00 00 44 00 00 00 6b 6b 6b 6b 6b a5 ......D...kkkkk. backtrace: [] kmem_cache_alloc_trace+0x584/0x880 [] jffs2_sum_add_inode_mem+0x54/0x90 [] jffs2_scan_medium.cold+0x4481/0x4794 [...] unreferenced object 0xffff888114b57280 (size 32): comm "mount", pid 692, jiffies 4294838393 (age 34.357s) hex dump (first 32 bytes): 10 d5 6c 11 81 88 ff ff 08 e0 05 00 00 00 01 00 ..l............. 00 00 38 02 00 00 28 00 00 00 6b 6b 6b 6b 6b a5 ..8...(...kkkkk. backtrace: [] kmem_cache_alloc_trace+0x584/0x880 [] jffs2_sum_add_xattr_mem+0x54/0x90 [] jffs2_scan_medium.cold+0x298c/0x4794 [...] unreferenced object 0xffff8881116cd510 (size 16): comm "mount", pid 692, jiffies 4294838395 (age 34.355s) hex dump (first 16 bytes): 00 00 00 00 00 00 00 00 09 e0 60 02 00 00 6b a5 ..........`...k. backtrace: [] kmem_cache_alloc_trace+0x584/0x880 [] jffs2_sum_add_xref_mem+0x54/0x90 [] jffs2_scan_medium.cold+0x3a20/0x4794 [...]

Therefore, we should call jffs2_sum_reset_collected(s) on exit to release the memory added in s. In addition, a new tag "out_buf" is added to prevent the NULL pointer reference caused by s being NULL. (thanks to Zhang Yi for this analysis)

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2022-49276"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:04Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\njffs2: fix memory leak in jffs2_scan_medium\n\nIf an error is returned in jffs2_scan_eraseblock() and some memory\nhas been added to the jffs2_summary *s, we can observe the following\nkmemleak report:\n\n--------------------------------------------\nunreferenced object 0xffff88812b889c40 (size 64):\n  comm \"mount\", pid 692, jiffies 4294838325 (age 34.288s)\n  hex dump (first 32 bytes):\n    40 48 b5 14 81 88 ff ff 01 e0 31 00 00 00 50 00  @H........1...P.\n    00 00 01 00 00 00 01 00 00 00 02 00 00 00 09 08  ................\n  backtrace:\n    [\u003cffffffffae93a3a3\u003e] __kmalloc+0x613/0x910\n    [\u003cffffffffaf423b9c\u003e] jffs2_sum_add_dirent_mem+0x5c/0xa0\n    [\u003cffffffffb0f3afa8\u003e] jffs2_scan_medium.cold+0x36e5/0x4794\n    [\u003cffffffffb0f3dbe1\u003e] jffs2_do_mount_fs.cold+0xa7/0x2267\n    [\u003cffffffffaf40acf3\u003e] jffs2_do_fill_super+0x383/0xc30\n    [\u003cffffffffaf40c00a\u003e] jffs2_fill_super+0x2ea/0x4c0\n    [\u003cffffffffb0315d64\u003e] mtd_get_sb+0x254/0x400\n    [\u003cffffffffb0315f5f\u003e] mtd_get_sb_by_nr+0x4f/0xd0\n    [\u003cffffffffb0316478\u003e] get_tree_mtd+0x498/0x840\n    [\u003cffffffffaf40bd15\u003e] jffs2_get_tree+0x25/0x30\n    [\u003cffffffffae9f358d\u003e] vfs_get_tree+0x8d/0x2e0\n    [\u003cffffffffaea7a98f\u003e] path_mount+0x50f/0x1e50\n    [\u003cffffffffaea7c3d7\u003e] do_mount+0x107/0x130\n    [\u003cffffffffaea7c5c5\u003e] __se_sys_mount+0x1c5/0x2f0\n    [\u003cffffffffaea7c917\u003e] __x64_sys_mount+0xc7/0x160\n    [\u003cffffffffb10142f5\u003e] do_syscall_64+0x45/0x70\nunreferenced object 0xffff888114b54840 (size 32):\n  comm \"mount\", pid 692, jiffies 4294838325 (age 34.288s)\n  hex dump (first 32 bytes):\n    c0 75 b5 14 81 88 ff ff 02 e0 02 00 00 00 02 00  .u..............\n    00 00 84 00 00 00 44 00 00 00 6b 6b 6b 6b 6b a5  ......D...kkkkk.\n  backtrace:\n    [\u003cffffffffae93be24\u003e] kmem_cache_alloc_trace+0x584/0x880\n    [\u003cffffffffaf423b04\u003e] jffs2_sum_add_inode_mem+0x54/0x90\n    [\u003cffffffffb0f3bd44\u003e] jffs2_scan_medium.cold+0x4481/0x4794\n    [...]\nunreferenced object 0xffff888114b57280 (size 32):\n  comm \"mount\", pid 692, jiffies 4294838393 (age 34.357s)\n  hex dump (first 32 bytes):\n    10 d5 6c 11 81 88 ff ff 08 e0 05 00 00 00 01 00  ..l.............\n    00 00 38 02 00 00 28 00 00 00 6b 6b 6b 6b 6b a5  ..8...(...kkkkk.\n  backtrace:\n    [\u003cffffffffae93be24\u003e] kmem_cache_alloc_trace+0x584/0x880\n    [\u003cffffffffaf423c34\u003e] jffs2_sum_add_xattr_mem+0x54/0x90\n    [\u003cffffffffb0f3a24f\u003e] jffs2_scan_medium.cold+0x298c/0x4794\n    [...]\nunreferenced object 0xffff8881116cd510 (size 16):\n  comm \"mount\", pid 692, jiffies 4294838395 (age 34.355s)\n  hex dump (first 16 bytes):\n    00 00 00 00 00 00 00 00 09 e0 60 02 00 00 6b a5  ..........`...k.\n  backtrace:\n    [\u003cffffffffae93be24\u003e] kmem_cache_alloc_trace+0x584/0x880\n    [\u003cffffffffaf423cc4\u003e] jffs2_sum_add_xref_mem+0x54/0x90\n    [\u003cffffffffb0f3b2e3\u003e] jffs2_scan_medium.cold+0x3a20/0x4794\n    [...]\n--------------------------------------------\n\nTherefore, we should call jffs2_sum_reset_collected(s) on exit to\nrelease the memory added in s. In addition, a new tag \"out_buf\" is\nadded to prevent the NULL pointer reference caused by s being NULL.\n(thanks to Zhang Yi for this analysis)",
  "id": "GHSA-jg9p-qrj8-5jw6",
  "modified": "2025-04-14T18:31:48Z",
  "published": "2025-04-14T18:31:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49276"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/455f4a23490bfcbedc8e5c245c463a59b19e5ddd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/51dbb5e36d59f62e34d462b801c1068248149cfe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/52ba0ab4f0a606f02a6163493378989faa1ec10a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82462324bf35b6b553400af1c1aa265069cee28f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b0c69182f09b70779817af4dcf89780955d5c4c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9cdd3128874f5fe759e2c4e1360ab7fb96a8d1df"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b26bbc0c122cad038831f226a4cb4de702225e16"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b36bccb04e14cc0c1e2d0e92d477fe220314fad6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e711913463af916d777a4873068f415f1fe2ad33"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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