CVE-2024-50265 (GCVE-0-2024-50265)

Vulnerability from cvelistv5 – Published: 2024-11-19 01:30 – Updated: 2025-11-03 22:27
VLAI?
Title
ocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove()
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove() Syzkaller is able to provoke null-ptr-dereference in ocfs2_xa_remove(): [ 57.319872] (a.out,1161,7):ocfs2_xa_remove:2028 ERROR: status = -12 [ 57.320420] (a.out,1161,7):ocfs2_xa_cleanup_value_truncate:1999 ERROR: Partial truncate while removing xattr overlay.upper. Leaking 1 clusters and removing the entry [ 57.321727] BUG: kernel NULL pointer dereference, address: 0000000000000004 [...] [ 57.325727] RIP: 0010:ocfs2_xa_block_wipe_namevalue+0x2a/0xc0 [...] [ 57.331328] Call Trace: [ 57.331477] <TASK> [...] [ 57.333511] ? do_user_addr_fault+0x3e5/0x740 [ 57.333778] ? exc_page_fault+0x70/0x170 [ 57.334016] ? asm_exc_page_fault+0x2b/0x30 [ 57.334263] ? __pfx_ocfs2_xa_block_wipe_namevalue+0x10/0x10 [ 57.334596] ? ocfs2_xa_block_wipe_namevalue+0x2a/0xc0 [ 57.334913] ocfs2_xa_remove_entry+0x23/0xc0 [ 57.335164] ocfs2_xa_set+0x704/0xcf0 [ 57.335381] ? _raw_spin_unlock+0x1a/0x40 [ 57.335620] ? ocfs2_inode_cache_unlock+0x16/0x20 [ 57.335915] ? trace_preempt_on+0x1e/0x70 [ 57.336153] ? start_this_handle+0x16c/0x500 [ 57.336410] ? preempt_count_sub+0x50/0x80 [ 57.336656] ? _raw_read_unlock+0x20/0x40 [ 57.336906] ? start_this_handle+0x16c/0x500 [ 57.337162] ocfs2_xattr_block_set+0xa6/0x1e0 [ 57.337424] __ocfs2_xattr_set_handle+0x1fd/0x5d0 [ 57.337706] ? ocfs2_start_trans+0x13d/0x290 [ 57.337971] ocfs2_xattr_set+0xb13/0xfb0 [ 57.338207] ? dput+0x46/0x1c0 [ 57.338393] ocfs2_xattr_trusted_set+0x28/0x30 [ 57.338665] ? ocfs2_xattr_trusted_set+0x28/0x30 [ 57.338948] __vfs_removexattr+0x92/0xc0 [ 57.339182] __vfs_removexattr_locked+0xd5/0x190 [ 57.339456] ? preempt_count_sub+0x50/0x80 [ 57.339705] vfs_removexattr+0x5f/0x100 [...] Reproducer uses faultinject facility to fail ocfs2_xa_remove() -> ocfs2_xa_value_truncate() with -ENOMEM. In this case the comment mentions that we can return 0 if ocfs2_xa_cleanup_value_truncate() is going to wipe the entry anyway. But the following 'rc' check is wrong and execution flow do 'ocfs2_xa_remove_entry(loc);' twice: * 1st: in ocfs2_xa_cleanup_value_truncate(); * 2nd: returning back to ocfs2_xa_remove() instead of going to 'out'. Fix this by skipping the 2nd removal of the same entry and making syzkaller repro happy.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 399ff3a748cf4c8c853e96dd477153202636527b , < 38cbf13b2e7a31362babe411f7c2c3c52cd2734b (git)
Affected: 399ff3a748cf4c8c853e96dd477153202636527b , < 168a9b8303fcb0317db4c06b23ce1c0ce2af4e10 (git)
Affected: 399ff3a748cf4c8c853e96dd477153202636527b , < 6a7e6dcf90fe7721d0863067b6ca9a9442134692 (git)
Affected: 399ff3a748cf4c8c853e96dd477153202636527b , < dcc8fe8c83145041cb6c80cac21f6173a3ff0204 (git)
Affected: 399ff3a748cf4c8c853e96dd477153202636527b , < 86dd0e8d42828923c68ad506933336bcd6f2317d (git)
Affected: 399ff3a748cf4c8c853e96dd477153202636527b , < dd73c942eed76a014c7a5597e6926435274d2c4c (git)
Affected: 399ff3a748cf4c8c853e96dd477153202636527b , < 2b5369528ee63c88371816178a05b5e664c87386 (git)
Affected: 399ff3a748cf4c8c853e96dd477153202636527b , < 0b63c0e01fba40e3992bc627272ec7b618ccaef7 (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.34
Unaffected: 0 , < 2.6.34 (semver)
Unaffected: 4.19.324 , ≤ 4.19.* (semver)
Unaffected: 5.4.286 , ≤ 5.4.* (semver)
Unaffected: 5.10.230 , ≤ 5.10.* (semver)
Unaffected: 5.15.172 , ≤ 5.15.* (semver)
Unaffected: 6.1.117 , ≤ 6.1.* (semver)
Unaffected: 6.6.61 , ≤ 6.6.* (semver)
Unaffected: 6.11.8 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove()\n\nSyzkaller is able to provoke null-ptr-dereference in ocfs2_xa_remove():\n\n[   57.319872] (a.out,1161,7):ocfs2_xa_remove:2028 ERROR: status = -12\n[   57.320420] (a.out,1161,7):ocfs2_xa_cleanup_value_truncate:1999 ERROR: Partial truncate while removing xattr overlay.upper.  Leaking 1 clusters and removing the entry\n[   57.321727] BUG: kernel NULL pointer dereference, address: 0000000000000004\n[...]\n[   57.325727] RIP: 0010:ocfs2_xa_block_wipe_namevalue+0x2a/0xc0\n[...]\n[   57.331328] Call Trace:\n[   57.331477]  \u003cTASK\u003e\n[...]\n[   57.333511]  ? do_user_addr_fault+0x3e5/0x740\n[   57.333778]  ? exc_page_fault+0x70/0x170\n[   57.334016]  ? asm_exc_page_fault+0x2b/0x30\n[   57.334263]  ? __pfx_ocfs2_xa_block_wipe_namevalue+0x10/0x10\n[   57.334596]  ? ocfs2_xa_block_wipe_namevalue+0x2a/0xc0\n[   57.334913]  ocfs2_xa_remove_entry+0x23/0xc0\n[   57.335164]  ocfs2_xa_set+0x704/0xcf0\n[   57.335381]  ? _raw_spin_unlock+0x1a/0x40\n[   57.335620]  ? ocfs2_inode_cache_unlock+0x16/0x20\n[   57.335915]  ? trace_preempt_on+0x1e/0x70\n[   57.336153]  ? start_this_handle+0x16c/0x500\n[   57.336410]  ? preempt_count_sub+0x50/0x80\n[   57.336656]  ? _raw_read_unlock+0x20/0x40\n[   57.336906]  ? start_this_handle+0x16c/0x500\n[   57.337162]  ocfs2_xattr_block_set+0xa6/0x1e0\n[   57.337424]  __ocfs2_xattr_set_handle+0x1fd/0x5d0\n[   57.337706]  ? ocfs2_start_trans+0x13d/0x290\n[   57.337971]  ocfs2_xattr_set+0xb13/0xfb0\n[   57.338207]  ? dput+0x46/0x1c0\n[   57.338393]  ocfs2_xattr_trusted_set+0x28/0x30\n[   57.338665]  ? ocfs2_xattr_trusted_set+0x28/0x30\n[   57.338948]  __vfs_removexattr+0x92/0xc0\n[   57.339182]  __vfs_removexattr_locked+0xd5/0x190\n[   57.339456]  ? preempt_count_sub+0x50/0x80\n[   57.339705]  vfs_removexattr+0x5f/0x100\n[...]\n\nReproducer uses faultinject facility to fail ocfs2_xa_remove() -\u003e\nocfs2_xa_value_truncate() with -ENOMEM.\n\nIn this case the comment mentions that we can return 0 if\nocfs2_xa_cleanup_value_truncate() is going to wipe the entry\nanyway. But the following \u0027rc\u0027 check is wrong and execution flow do\n\u0027ocfs2_xa_remove_entry(loc);\u0027 twice:\n* 1st: in ocfs2_xa_cleanup_value_truncate();\n* 2nd: returning back to ocfs2_xa_remove() instead of going to \u0027out\u0027.\n\nFix this by skipping the 2nd removal of the same entry and making\nsyzkaller repro happy."
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        "dateUpdated": "2025-05-04T09:50:16.844Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/38cbf13b2e7a31362babe411f7c2c3c52cd2734b"
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        {
          "url": "https://git.kernel.org/stable/c/168a9b8303fcb0317db4c06b23ce1c0ce2af4e10"
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        {
          "url": "https://git.kernel.org/stable/c/6a7e6dcf90fe7721d0863067b6ca9a9442134692"
        },
        {
          "url": "https://git.kernel.org/stable/c/dcc8fe8c83145041cb6c80cac21f6173a3ff0204"
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          "url": "https://git.kernel.org/stable/c/86dd0e8d42828923c68ad506933336bcd6f2317d"
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          "url": "https://git.kernel.org/stable/c/0b63c0e01fba40e3992bc627272ec7b618ccaef7"
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      "title": "ocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50265",
    "datePublished": "2024-11-19T01:30:00.861Z",
    "dateReserved": "2024-10-21T19:36:19.982Z",
    "dateUpdated": "2025-11-03T22:27:45.242Z",
    "state": "PUBLISHED"
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\"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T15:25:39.205Z\"}}], \"cna\": {\"title\": \"ocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"399ff3a748cf4c8c853e96dd477153202636527b\", \"lessThan\": \"38cbf13b2e7a31362babe411f7c2c3c52cd2734b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"399ff3a748cf4c8c853e96dd477153202636527b\", \"lessThan\": \"168a9b8303fcb0317db4c06b23ce1c0ce2af4e10\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"399ff3a748cf4c8c853e96dd477153202636527b\", \"lessThan\": \"6a7e6dcf90fe7721d0863067b6ca9a9442134692\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"399ff3a748cf4c8c853e96dd477153202636527b\", \"lessThan\": \"dcc8fe8c83145041cb6c80cac21f6173a3ff0204\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"399ff3a748cf4c8c853e96dd477153202636527b\", \"lessThan\": \"86dd0e8d42828923c68ad506933336bcd6f2317d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"399ff3a748cf4c8c853e96dd477153202636527b\", \"lessThan\": \"dd73c942eed76a014c7a5597e6926435274d2c4c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"399ff3a748cf4c8c853e96dd477153202636527b\", \"lessThan\": \"2b5369528ee63c88371816178a05b5e664c87386\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"399ff3a748cf4c8c853e96dd477153202636527b\", \"lessThan\": \"0b63c0e01fba40e3992bc627272ec7b618ccaef7\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ocfs2/xattr.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.34\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.34\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.324\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.286\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.230\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.172\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.117\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.61\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ocfs2/xattr.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/38cbf13b2e7a31362babe411f7c2c3c52cd2734b\"}, {\"url\": \"https://git.kernel.org/stable/c/168a9b8303fcb0317db4c06b23ce1c0ce2af4e10\"}, {\"url\": \"https://git.kernel.org/stable/c/6a7e6dcf90fe7721d0863067b6ca9a9442134692\"}, {\"url\": \"https://git.kernel.org/stable/c/dcc8fe8c83145041cb6c80cac21f6173a3ff0204\"}, {\"url\": \"https://git.kernel.org/stable/c/86dd0e8d42828923c68ad506933336bcd6f2317d\"}, {\"url\": \"https://git.kernel.org/stable/c/dd73c942eed76a014c7a5597e6926435274d2c4c\"}, {\"url\": \"https://git.kernel.org/stable/c/2b5369528ee63c88371816178a05b5e664c87386\"}, {\"url\": \"https://git.kernel.org/stable/c/0b63c0e01fba40e3992bc627272ec7b618ccaef7\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove()\\n\\nSyzkaller is able to provoke null-ptr-dereference in ocfs2_xa_remove():\\n\\n[   57.319872] (a.out,1161,7):ocfs2_xa_remove:2028 ERROR: status = -12\\n[   57.320420] (a.out,1161,7):ocfs2_xa_cleanup_value_truncate:1999 ERROR: Partial truncate while removing xattr overlay.upper.  Leaking 1 clusters and removing the entry\\n[   57.321727] BUG: kernel NULL pointer dereference, address: 0000000000000004\\n[...]\\n[   57.325727] RIP: 0010:ocfs2_xa_block_wipe_namevalue+0x2a/0xc0\\n[...]\\n[   57.331328] Call Trace:\\n[   57.331477]  \u003cTASK\u003e\\n[...]\\n[   57.333511]  ? do_user_addr_fault+0x3e5/0x740\\n[   57.333778]  ? exc_page_fault+0x70/0x170\\n[   57.334016]  ? asm_exc_page_fault+0x2b/0x30\\n[   57.334263]  ? __pfx_ocfs2_xa_block_wipe_namevalue+0x10/0x10\\n[   57.334596]  ? ocfs2_xa_block_wipe_namevalue+0x2a/0xc0\\n[   57.334913]  ocfs2_xa_remove_entry+0x23/0xc0\\n[   57.335164]  ocfs2_xa_set+0x704/0xcf0\\n[   57.335381]  ? _raw_spin_unlock+0x1a/0x40\\n[   57.335620]  ? ocfs2_inode_cache_unlock+0x16/0x20\\n[   57.335915]  ? trace_preempt_on+0x1e/0x70\\n[   57.336153]  ? start_this_handle+0x16c/0x500\\n[   57.336410]  ? preempt_count_sub+0x50/0x80\\n[   57.336656]  ? _raw_read_unlock+0x20/0x40\\n[   57.336906]  ? start_this_handle+0x16c/0x500\\n[   57.337162]  ocfs2_xattr_block_set+0xa6/0x1e0\\n[   57.337424]  __ocfs2_xattr_set_handle+0x1fd/0x5d0\\n[   57.337706]  ? ocfs2_start_trans+0x13d/0x290\\n[   57.337971]  ocfs2_xattr_set+0xb13/0xfb0\\n[   57.338207]  ? dput+0x46/0x1c0\\n[   57.338393]  ocfs2_xattr_trusted_set+0x28/0x30\\n[   57.338665]  ? ocfs2_xattr_trusted_set+0x28/0x30\\n[   57.338948]  __vfs_removexattr+0x92/0xc0\\n[   57.339182]  __vfs_removexattr_locked+0xd5/0x190\\n[   57.339456]  ? preempt_count_sub+0x50/0x80\\n[   57.339705]  vfs_removexattr+0x5f/0x100\\n[...]\\n\\nReproducer uses faultinject facility to fail ocfs2_xa_remove() -\u003e\\nocfs2_xa_value_truncate() with -ENOMEM.\\n\\nIn this case the comment mentions that we can return 0 if\\nocfs2_xa_cleanup_value_truncate() is going to wipe the entry\\nanyway. But the following \u0027rc\u0027 check is wrong and execution flow do\\n\u0027ocfs2_xa_remove_entry(loc);\u0027 twice:\\n* 1st: in ocfs2_xa_cleanup_value_truncate();\\n* 2nd: returning back to ocfs2_xa_remove() instead of going to \u0027out\u0027.\\n\\nFix this by skipping the 2nd removal of the same entry and making\\nsyzkaller repro happy.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.324\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.286\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.230\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.172\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.117\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.61\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.8\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"2.6.34\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:50:16.844Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-50265\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-01T20:17:23.985Z\", \"dateReserved\": \"2024-10-21T19:36:19.982Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-11-19T01:30:00.861Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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Detection rules are retrieved from Rulezet.