ghsa-r32h-q4vw-rvf3
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
mlxsw: spectrum_acl_tcam: Fix memory leak when canceling rehash work
The rehash delayed work is rescheduled with a delay if the number of credits at end of the work is not negative as supposedly it means that the migration ended. Otherwise, it is rescheduled immediately.
After "mlxsw: spectrum_acl_tcam: Fix possible use-after-free during rehash" the above is no longer accurate as a non-negative number of credits is no longer indicative of the migration being done. It can also happen if the work encountered an error in which case the migration will resume the next time the work is scheduled.
The significance of the above is that it is possible for the work to be pending and associated with hints that were allocated when the migration started. This leads to the hints being leaked [1] when the work is canceled while pending as part of ACL region dismantle.
Fix by freeing the hints if hints are associated with a work that was canceled while pending.
Blame the original commit since the reliance on not having a pending work associated with hints is fragile.
[1] unreferenced object 0xffff88810e7c3000 (size 256): comm "kworker/0:16", pid 176, jiffies 4295460353 hex dump (first 32 bytes): 00 30 95 11 81 88 ff ff 61 00 00 00 00 00 00 80 .0......a....... 00 00 61 00 40 00 00 00 00 00 00 00 04 00 00 00 ..a.@........... backtrace (crc 2544ddb9): [<00000000cf8cfab3>] kmalloc_trace+0x23f/0x2a0 [<000000004d9a1ad9>] objagg_hints_get+0x42/0x390 [<000000000b143cf3>] mlxsw_sp_acl_erp_rehash_hints_get+0xca/0x400 [<0000000059bdb60a>] mlxsw_sp_acl_tcam_vregion_rehash_work+0x868/0x1160 [<00000000e81fd734>] process_one_work+0x59c/0xf20 [<00000000ceee9e81>] worker_thread+0x799/0x12c0 [<00000000bda6fe39>] kthread+0x246/0x300 [<0000000070056d23>] ret_from_fork+0x34/0x70 [<00000000dea2b93e>] ret_from_fork_asm+0x1a/0x30
{
"affected": [],
"aliases": [
"CVE-2024-35852"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-17T15:15:22Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmlxsw: spectrum_acl_tcam: Fix memory leak when canceling rehash work\n\nThe rehash delayed work is rescheduled with a delay if the number of\ncredits at end of the work is not negative as supposedly it means that\nthe migration ended. Otherwise, it is rescheduled immediately.\n\nAfter \"mlxsw: spectrum_acl_tcam: Fix possible use-after-free during\nrehash\" the above is no longer accurate as a non-negative number of\ncredits is no longer indicative of the migration being done. It can also\nhappen if the work encountered an error in which case the migration will\nresume the next time the work is scheduled.\n\nThe significance of the above is that it is possible for the work to be\npending and associated with hints that were allocated when the migration\nstarted. This leads to the hints being leaked [1] when the work is\ncanceled while pending as part of ACL region dismantle.\n\nFix by freeing the hints if hints are associated with a work that was\ncanceled while pending.\n\nBlame the original commit since the reliance on not having a pending\nwork associated with hints is fragile.\n\n[1]\nunreferenced object 0xffff88810e7c3000 (size 256):\n comm \"kworker/0:16\", pid 176, jiffies 4295460353\n hex dump (first 32 bytes):\n 00 30 95 11 81 88 ff ff 61 00 00 00 00 00 00 80 .0......a.......\n 00 00 61 00 40 00 00 00 00 00 00 00 04 00 00 00 ..a.@...........\n backtrace (crc 2544ddb9):\n [\u003c00000000cf8cfab3\u003e] kmalloc_trace+0x23f/0x2a0\n [\u003c000000004d9a1ad9\u003e] objagg_hints_get+0x42/0x390\n [\u003c000000000b143cf3\u003e] mlxsw_sp_acl_erp_rehash_hints_get+0xca/0x400\n [\u003c0000000059bdb60a\u003e] mlxsw_sp_acl_tcam_vregion_rehash_work+0x868/0x1160\n [\u003c00000000e81fd734\u003e] process_one_work+0x59c/0xf20\n [\u003c00000000ceee9e81\u003e] worker_thread+0x799/0x12c0\n [\u003c00000000bda6fe39\u003e] kthread+0x246/0x300\n [\u003c0000000070056d23\u003e] ret_from_fork+0x34/0x70\n [\u003c00000000dea2b93e\u003e] ret_from_fork_asm+0x1a/0x30",
"id": "GHSA-r32h-q4vw-rvf3",
"modified": "2024-06-25T21:31:13Z",
"published": "2024-05-17T15:31:12Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-35852"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/51cefc9da400b953fee749c9e5d26cd4a2b5d758"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5bfe7bf9656ed2633718388f12b7c38b86414a04"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/63d814d93c5cce4c18284adc810028f28dca493f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/857ed800133ffcfcee28582090b63b0cbb8ba59d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d72dd6fcd7886d0523afbab8b4a4b22d17addd7d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/de1aaefa75be9d0ec19c9a3e0e2f9696de20c6ab"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fb4e2b70a7194b209fc7320bbf33b375f7114bd5"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
}
],
"schema_version": "1.4.0",
"severity": []
}
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.