CVE-2024-26746

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Source
https://nvd.nist.gov/vuln/detail/CVE-2024-26746
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-26746.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-26746
Related
Published
2024-04-04T09:15:07Z
Modified
2024-09-11T05:03:30.398494Z
Summary
[none]
Details

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

dmaengine: idxd: Ensure safe user copy of completion record

If CONFIGHARDENEDUSERCOPY is enabled, copying completion record from event log cache to user triggers a kernel bug.

[ 1987.159822] usercopy: Kernel memory exposure attempt detected from SLUB object 'dsa0' (offset 74, size 31)! [ 1987.170845] ------------[ cut here ]------------ [ 1987.176086] kernel BUG at mm/usercopy.c:102! [ 1987.180946] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI [ 1987.186866] CPU: 17 PID: 528 Comm: kworker/17:1 Not tainted 6.8.0-rc2+ #5 [ 1987.194537] Hardware name: Intel Corporation AvenueCity/AvenueCity, BIOS BHSDCRB1.86B.2492.D03.2307181620 07/18/2023 [ 1987.206405] Workqueue: wq0.0 idxdevlfaultwork [idxd] [ 1987.212338] RIP: 0010:usercopyabort+0x72/0x90 [ 1987.217381] Code: 58 65 9c 50 48 c7 c2 17 85 61 9c 57 48 c7 c7 98 fd 6b 9c 48 0f 44 d6 48 c7 c6 b3 08 62 9c 4c 89 d1 49 0f 44 f3 e8 1e 2e d5 ff <0f> 0b 49 c7 c1 9e 42 61 9c 4c 89 cf 4d 89 c8 eb a9 66 66 2e 0f 1f [ 1987.238505] RSP: 0018:ff62f5cf20607d60 EFLAGS: 00010246 [ 1987.244423] RAX: 000000000000005f RBX: 000000000000001f RCX: 0000000000000000 [ 1987.252480] RDX: 0000000000000000 RSI: ffffffff9c61429e RDI: 00000000ffffffff [ 1987.260538] RBP: ff62f5cf20607d78 R08: ff2a6a89ef3fffe8 R09: 00000000fffeffff [ 1987.268595] R10: ff2a6a89eed00000 R11: 0000000000000003 R12: ff2a66934849c89a [ 1987.276652] R13: 0000000000000001 R14: ff2a66934849c8b9 R15: ff2a66934849c899 [ 1987.284710] FS: 0000000000000000(0000) GS:ff2a66b22fe40000(0000) knlGS:0000000000000000 [ 1987.293850] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1987.300355] CR2: 00007fe291a37000 CR3: 000000010fbd4005 CR4: 0000000000f71ef0 [ 1987.308413] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1987.316470] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400 [ 1987.324527] PKRU: 55555554 [ 1987.327622] Call Trace: [ 1987.330424] <TASK> [ 1987.332826] ? showregs+0x6e/0x80 [ 1987.336703] ? die+0x3c/0xa0 [ 1987.339988] ? dotrap+0xd4/0xf0 [ 1987.343662] ? doerrortrap+0x75/0xa0 [ 1987.347922] ? usercopyabort+0x72/0x90 [ 1987.352277] ? excinvalidop+0x57/0x80 [ 1987.356634] ? usercopyabort+0x72/0x90 [ 1987.360988] ? asmexcinvalidop+0x1f/0x30 [ 1987.365734] ? usercopyabort+0x72/0x90 [ 1987.370088] _checkheapobject+0xb7/0xd0 [ 1987.374739] _checkobjectsize+0x175/0x2d0 [ 1987.379588] idxdcopycr+0xa9/0x130 [idxd] [ 1987.384341] idxdevlfaultwork+0x127/0x390 [idxd] [ 1987.389878] processonework+0x13e/0x300 [ 1987.394435] ? _pfxworkerthread+0x10/0x10 [ 1987.399284] workerthread+0x2f7/0x420 [ 1987.403544] ? _rawspinunlockirqrestore+0x2b/0x50 [ 1987.409171] ? _pfxworkerthread+0x10/0x10 [ 1987.414019] kthread+0x107/0x140 [ 1987.417693] ? _pfxkthread+0x10/0x10 [ 1987.421954] retfromfork+0x3d/0x60 [ 1987.426019] ? _pfxkthread+0x10/0x10 [ 1987.430281] retfromforkasm+0x1b/0x30 [ 1987.434744] </TASK>

The issue arises because event log cache is created using kmemcachecreate() which is not suitable for user copy.

Fix the issue by creating event log cache with kmemcachecreate_usercopy(), ensuring safe user copy.

References

Affected packages

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.7.9-1

Affected versions

6.*

6.1.27-1
6.1.37-1
6.1.38-1
6.1.38-2~bpo11+1
6.1.38-2
6.1.38-3
6.1.38-4~bpo11+1
6.1.38-4
6.1.52-1
6.1.55-1~bpo11+1
6.1.55-1
6.1.64-1
6.1.66-1
6.1.67-1
6.1.69-1~bpo11+1
6.1.69-1
6.1.76-1~bpo11+1
6.1.76-1
6.1.82-1
6.1.85-1
6.1.90-1~bpo11+1
6.1.90-1
6.1.94-1~bpo11+1
6.1.94-1
6.1.98-1
6.1.99-1
6.1.106-1
6.1.106-2
6.1.106-3
6.3.1-1~exp1
6.3.2-1~exp1
6.3.4-1~exp1
6.3.5-1~exp1
6.3.7-1~bpo12+1
6.3.7-1
6.3.11-1
6.4~rc6-1~exp1
6.4~rc7-1~exp1
6.4.1-1~exp1
6.4.4-1~bpo12+1
6.4.4-1
6.4.4-2
6.4.4-3~bpo12+1
6.4.4-3
6.4.11-1
6.4.13-1
6.5~rc4-1~exp1
6.5~rc6-1~exp1
6.5~rc7-1~exp1
6.5.1-1~exp1
6.5.3-1~bpo12+1
6.5.3-1
6.5.6-1
6.5.8-1
6.5.10-1~bpo12+1
6.5.10-1
6.5.13-1
6.6.3-1~exp1
6.6.4-1~exp1
6.6.7-1~exp1
6.6.8-1
6.6.9-1
6.6.11-1
6.6.13-1~bpo12+1
6.6.13-1
6.6.15-1
6.6.15-2
6.7-1~exp1
6.7.1-1~exp1
6.7.4-1~exp1
6.7.7-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}