CVE-2024-54031

Summary

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

netfilter: nft_set_hash: unaligned atomic read on struct nft_set_ext

Access to genmask field in struct nft_set_ext results in unaligned atomic read:

[ 72.130109] Unable to handle kernel paging request at virtual address ffff0000c2bb708c [ 72.131036] Mem abort info: [ 72.131213] ESR = 0x0000000096000021 [ 72.131446] EC = 0x25: DABT (current EL), IL = 32 bits [ 72.132209] SET = 0, FnV = 0 [ 72.133216] EA = 0, S1PTW = 0 [ 72.134080] FSC = 0x21: alignment fault [ 72.135593] Data abort info: [ 72.137194] ISV = 0, ISS = 0x00000021, ISS2 = 0x00000000 [ 72.142351] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 72.145989] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 72.150115] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000237d27000 [ 72.154893] [ffff0000c2bb708c] pgd=0000000000000000, p4d=180000023ffff403, pud=180000023f84b403, pmd=180000023f835403, +pte=0068000102bb7707 [ 72.163021] Internal error: Oops: 0000000096000021 [#1] SMP […] [ 72.170041] CPU: 7 UID: 0 PID: 54 Comm: kworker/7:0 Tainted: G E 6.13.0-rc3+ #2 [ 72.170509] Tainted: [E]=UNSIGNED_MODULE [ 72.170720] Hardware name: QEMU QEMU Virtual Machine, BIOS edk2-stable202302-for-qemu 03/01/2023 [ 72.171192] Workqueue: events_power_efficient nft_rhash_gc [nf_tables] [ 72.171552] pstate: 21400005 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=–) [ 72.171915] pc : nft_rhash_gc+0x200/0x2d8 [nf_tables] [ 72.172166] lr : nft_rhash_gc+0x128/0x2d8 [nf_tables] [ 72.172546] sp : ffff800081f2bce0 [ 72.172724] x29: ffff800081f2bd40 x28: ffff0000c2bb708c x27: 0000000000000038 [ 72.173078] x26: ffff0000c6780ef0 x25: ffff0000c643df00 x24: ffff0000c6778f78 [ 72.173431] x23: 000000000000001a x22: ffff0000c4b1f000 x21: ffff0000c6780f78 [ 72.173782] x20: ffff0000c2bb70dc x19: ffff0000c2bb7080 x18: 0000000000000000 [ 72.174135] x17: ffff0000c0a4e1c0 x16: 0000000000003000 x15: 0000ac26d173b978 [ 72.174485] x14: ffffffffffffffff x13: 0000000000000030 x12: ffff0000c6780ef0 [ 72.174841] x11: 0000000000000000 x10: ffff800081f2bcf8 x9 : ffff0000c3000000 [ 72.175193] x8 : 00000000000004be x7 : 0000000000000000 x6 : 0000000000000000 [ 72.175544] x5 : 0000000000000040 x4 : ffff0000c3000010 x3 : 0000000000000000 [ 72.175871] x2 : 0000000000003a98 x1 : ffff0000c2bb708c x0 : 0000000000000004 [ 72.176207] Call trace: [ 72.176316] nft_rhash_gc+0x200/0x2d8 [nf_tables] (P) [ 72.176653] process_one_work+0x178/0x3d0 [ 72.176831] worker_thread+0x200/0x3f0 [ 72.176995] kthread+0xe8/0xf8 [ 72.177130] ret_from_fork+0x10/0x20 [ 72.177289] Code: 54fff984 d503201f d2800080 91003261 (f820303f) [ 72.177557] —[ end trace 0000000000000000 ]—

Align struct nft_set_ext to word size to address this and documentation it.

pahole reports that this increases the size of elements for rhash and pipapo in 8 bytes on x86_64.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux98d62cf0e26305dd6a1932a4054004290f4194bb < 352f8eaaabd008f09d1e176194edc261a7304084affected
LinuxLinuxe21855091f11df80d41239dbc5f8545b772c657d < 6a14b46052eeb83175a95baf399283860b9d94c4affected
LinuxLinux59a59da8de47848575eedc141a74aae57696706d < 277f00b0c2dca8794cf4837722960bdc4174911faffected
LinuxLinux23a6919bb3ecf6787f060476ee6810ad55ebf9c8 < 607774a13764676d4b8be9c8b9c66b8cf3469043affected
LinuxLinux86c27603514cb8ead29857365cdd145404ee9706 < 4f49349c1963e507aa37c1ec05178faeb0103959affected
LinuxLinuxbe4d0ac67d92e6a285cd3eeb672188d249c121b2 < d24cbc43cc7b41a0824b0bc6ec4d8436d8d7a9c0affected
LinuxLinux7ffc7481153bbabf3332c6a19b289730c7e1edf5 < 542ed8145e6f9392e3d0a86a0e9027d2ffd183e4affected
LinuxLinux5.4.287 < 5.4.289affected
LinuxLinux5.10.231 < 5.10.233affected
LinuxLinux5.15.174 < 5.15.176affected
LinuxLinux6.1.120 < 6.1.124affected
LinuxLinux6.6.66 < 6.6.70affected
LinuxLinux6.12.5 < 6.12.9affected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References