CVE - CVE-2024-35852

CVE-ID
CVE-2024-35852	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/51cefc9da400b953fee749c9e5d26cd4a2b5d758 URL:https://git.kernel.org/stable/c/51cefc9da400b953fee749c9e5d26cd4a2b5d758 MISC:https://git.kernel.org/stable/c/5bfe7bf9656ed2633718388f12b7c38b86414a04 URL:https://git.kernel.org/stable/c/5bfe7bf9656ed2633718388f12b7c38b86414a04 MISC:https://git.kernel.org/stable/c/63d814d93c5cce4c18284adc810028f28dca493f URL:https://git.kernel.org/stable/c/63d814d93c5cce4c18284adc810028f28dca493f MISC:https://git.kernel.org/stable/c/857ed800133ffcfcee28582090b63b0cbb8ba59d URL:https://git.kernel.org/stable/c/857ed800133ffcfcee28582090b63b0cbb8ba59d MISC:https://git.kernel.org/stable/c/d72dd6fcd7886d0523afbab8b4a4b22d17addd7d URL:https://git.kernel.org/stable/c/d72dd6fcd7886d0523afbab8b4a4b22d17addd7d MISC:https://git.kernel.org/stable/c/de1aaefa75be9d0ec19c9a3e0e2f9696de20c6ab URL:https://git.kernel.org/stable/c/de1aaefa75be9d0ec19c9a3e0e2f9696de20c6ab MISC:https://git.kernel.org/stable/c/fb4e2b70a7194b209fc7320bbf33b375f7114bd5 URL:https://git.kernel.org/stable/c/fb4e2b70a7194b209fc7320bbf33b375f7114bd5
Assigning CNA
kernel.org
Date Record Created
20240517	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240517)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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