CVE-2024-26688
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2024-26688
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-26688.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2024-26688
- Downstream
- Related
- Published
- 2024-04-03T14:54:49Z
- Modified
- 2025-10-09T06:27:23.471320Z
- Summary
- fs,hugetlb: fix NULL pointer dereference in hugetlbs_fill_super
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
fs,hugetlb: fix NULL pointer dereference in hugetlbsfillsuper
When configuring a hugetlb filesystem via the fsconfig() syscall, there is a possible NULL dereference in hugetlbfsfillsuper() caused by assigning NULL to ctx->hstate in hugetlbfsparseparam() when the requested pagesize is non valid.
E.g: Taking the following steps:
fd = fsopen("hugetlbfs", FSOPEN_CLOEXEC); fsconfig(fd, FSCONFIG_SET_STRING, "pagesize", "1024", 0); fsconfig(fd, FSCONFIG_CMD_CREATE, NULL, NULL, 0);Given that the requested "pagesize" is invalid, ctxt->hstate will be replaced with NULL, losing its previous value, and we will print an error:
... ... case Optpagesize: ps = memparse(param->string, &rest); ctx->hstate = h; if (!ctx->hstate) { prerr("Unsupported page size %lu MB\n", ps / SZ_1M); return -EINVAL; } return 0; ... ...
This is a problem because later on, we will dereference ctxt->hstate in hugetlbfsfillsuper()
... ... sb->sblocksize = hugepage_size(ctx->hstate); ... ...
Causing below Oops.
Fix this by replacing cxt->hstate value only when then pagesize is known to be valid.
kernel: hugetlbfs: Unsupported page size 0 MB kernel: BUG: kernel NULL pointer dereference, address: 0000000000000028 kernel: #PF: supervisor read access in kernel mode kernel: #PF: errorcode(0x0000) - not-present page kernel: PGD 800000010f66c067 P4D 800000010f66c067 PUD 1b22f8067 PMD 0 kernel: Oops: 0000 [#1] PREEMPT SMP PTI kernel: CPU: 4 PID: 5659 Comm: syscall Tainted: G E 6.8.0-rc2-default+ #22 5a47c3fef76212addcc6eb71344aabc35190ae8f kernel: Hardware name: Intel Corp. GROVEPORT/GROVEPORT, BIOS GVPRCRB1.86B.0016.D04.1705030402 05/03/2017 kernel: RIP: 0010:hugetlbfsfillsuper+0xb4/0x1a0 kernel: Code: 48 8b 3b e8 3e c6 ed ff 48 85 c0 48 89 45 20 0f 84 d6 00 00 00 48 b8 ff ff ff ff ff ff ff 7f 4c 89 e7 49 89 44 24 20 48 8b 03 <8b> 48 28 b8 00 10 00 00 48 d3 e0 49 89 44 24 18 48 8b 03 8b 40 28 kernel: RSP: 0018:ffffbe9960fcbd48 EFLAGS: 00010246 kernel: RAX: 0000000000000000 RBX: ffff9af5272ae780 RCX: 0000000000372004 kernel: RDX: ffffffffffffffff RSI: ffffffffffffffff RDI: ffff9af555e9b000 kernel: RBP: ffff9af52ee66b00 R08: 0000000000000040 R09: 0000000000370004 kernel: R10: ffffbe9960fcbd48 R11: 0000000000000040 R12: ffff9af555e9b000 kernel: R13: ffffffffa66b86c0 R14: ffff9af507d2f400 R15: ffff9af507d2f400 kernel: FS: 00007ffbc0ba4740(0000) GS:ffff9b0bd7000000(0000) knlGS:0000000000000000 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kernel: CR2: 0000000000000028 CR3: 00000001b1ee0000 CR4: 00000000001506f0 kernel: Call Trace: kernel: <TASK> kernel: ? _diebody+0x1a/0x60 kernel: ? pagefaultoops+0x16f/0x4a0 kernel: ? searchbpfextables+0x65/0x70 kernel: ? fixupexception+0x22/0x310 kernel: ? excpagefault+0x69/0x150 kernel: ? asmexcpagefault+0x22/0x30 kernel: ? _pfxhugetlbfsfillsuper+0x10/0x10 kernel: ? hugetlbfsfillsuper+0xb4/0x1a0 kernel: ? hugetlbfsfillsuper+0x28/0x1a0 kernel: ? _pfxhugetlbfsfillsuper+0x10/0x10 kernel: vfsgetsuper+0x40/0xa0 kernel: ? _pfxbpflsmcapable+0x10/0x10 kernel: vfsgettree+0x25/0xd0 kernel: vfscmdcreate+0x64/0xe0 kernel: _x64sysfsconfig+0x395/0x410 kernel: dosyscall64+0x80/0x160 kernel: ? syscallexittousermode+0x82/0x240 kernel: ? dosyscall64+0x8d/0x160 kernel: ? syscallexittousermode+0x82/0x240 kernel: ? dosyscall64+0x8d/0x160 kernel: ? excpagefault+0x69/0x150 kernel: entrySYSCALL64afterhwframe+0x6e/0x76 kernel: RIP: 0033:0x7ffbc0cb87c9 kernel: Code: 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 97 96 0d 00 f7 d8 64 89 01 48 kernel: RSP: 002b:00007ffc29d2f388 EFLAGS: 00000206 ORIG_RAX: 00000000000001af kernel: RAX: fffffffffff ---truncated---
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/13c5a9fb07105557a1fa9efdb4f23d7ef30b7274
- https://git.kernel.org/stable/c/1dde8ef4b7a749ae1bc73617c91775631d167557
- https://git.kernel.org/stable/c/22850c9950a4e43a67299755d11498f3292d02ff
- https://git.kernel.org/stable/c/2e2c07104b4904aed1389a59b25799b95a85b5b9
- https://git.kernel.org/stable/c/79d72c68c58784a3e1cd2378669d51bfd0cb7498
- https://git.kernel.org/stable/c/80d852299987a8037be145a94f41874228f1a773
- https://git.kernel.org/stable/c/ec78418801ef7b0c22cd6a30145ec480dd48db39
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced32021982a324dce93b4ae00c06213bf45fb319c8Fixed1dde8ef4b7a749ae1bc73617c91775631d167557
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced32021982a324dce93b4ae00c06213bf45fb319c8Fixed80d852299987a8037be145a94f41874228f1a773
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced32021982a324dce93b4ae00c06213bf45fb319c8Fixed22850c9950a4e43a67299755d11498f3292d02ff
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced32021982a324dce93b4ae00c06213bf45fb319c8Fixed2e2c07104b4904aed1389a59b25799b95a85b5b9
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced32021982a324dce93b4ae00c06213bf45fb319c8Fixed13c5a9fb07105557a1fa9efdb4f23d7ef30b7274
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced32021982a324dce93b4ae00c06213bf45fb319c8Fixedec78418801ef7b0c22cd6a30145ec480dd48db39
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced32021982a324dce93b4ae00c06213bf45fb319c8Fixed79d72c68c58784a3e1cd2378669d51bfd0cb7498
Affected versions
v5.*
v6.*
Linux / Kernel
Package
- Name
- Kernel
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced5.1.0Fixed5.4.271
- Type
- ECOSYSTEM
- Events
-
Introduced5.5.0Fixed5.10.212
- Type
- ECOSYSTEM
- Events
-
Introduced5.11.0Fixed5.15.151
- Type
- ECOSYSTEM
- Events
-
Introduced5.16.0Fixed6.1.79
- Type
- ECOSYSTEM
- Events
-
Introduced6.2.0Fixed6.6.18
- Type
- ECOSYSTEM
- Events
-
Introduced6.7.0Fixed6.7.6